Patent application number | Description | Published |
20080205726 | Method for providing extended possibilities when imaging a patient's heart - The invention relates to the use of 2D projection images which belong to a specific common heart phase. A 3D image data set can be used to generate a reference projection image for the same projection angle for each of the 2D projection images and a differential image can be derived from the reference projection image and 2D projection image. The differential images are back-projected and combined in one 3D differential image data set and, by using this, a deformed 3D image data set is obtained from the previously recorded 3D image data set. Iterations guarantee that the deformed 3D image data set ensues with the smallest possible distance from the 2D projection images for the existing common heart phase. Finally, a 3D image data set is available for a different heart phase other than the reference heart phase and the possibilities for imaging a patient's heart are extended. | 08-28-2008 |
20080208040 | Method for three-dimensional localization of an instrument for an interventional access and associated device - The invention relates to a method for three-dimensional localization of an instrument for an interventional access, comprising: creating a three-dimensional image recording covering a region of the intervention and surroundings; determining local attenuation values of the three-dimensional image recording by x-ray absorption characteristics; recording a two-dimensional image recording covering the region of the intervention and surroundings; determining an x-ray intensity at an x-ray sensor arranged on the instrument; localizing the x-ray sensor in the two-dimensional image recording based on the x-ray intensity; summing the local attenuation values along a virtual x-ray path passing through the x-ray sensor in the three-dimensional image recording; identifying a point on the virtual x-ray path where the attenuation sum corresponds to the x-ray intensity at the x-ray sensor; and determining a three-dimensional position of the point corresponding to the three-dimensional position of the x-ray sensor on the instrument. | 08-28-2008 |
20080212858 | Method for image registration processes and X-ray angiography system - Registration of preoperatively acquired MRI images of soft parts to intraoperatively acquired X-ray images of soft parts is not possible. The invention shows a way of nevertheless using such preoperatively acquired images for superimposition with 2D projections of the soft parts, taking an indirect route via 3D/3D registration of images of the spinal column. For this purpose, 3D image data sets of the spinal column must be obtained separately on the one hand using MRI and on the other using the X-ray imaging system so that the 3D/3D registration produces a mapping rule which then also applies to the preoperatively acquired images of the soft part if the soft part images and the spinal images are acquired without intervening change in the patient position in the MRI scanner. | 09-04-2008 |
20080240338 | Evaluation method for mapping the myocardium of a patient - The invention relates to an evaluation method for mapping the myocardium of a patient, in particular the automated, functional evaluation, for instance the heart perfusion, in angiographic series with the steps: recording a series of angiographic recordings directly after administering a contrast agent to the patient; determining a reference area in an angiographic recording; determining a trend pattern of the contrast agent as a reference curve within the reference area from the series of angiographic recordings; obtaining trend patterns of the contrast agent from all areas of the angiographic recordings; determining the correlation between the trend patterns and the reference curve as a measure for the interrelationship between statistical variables, comparison with stored reference curve; comparison of the correlation coefficient with a threshold value; and reproduction of a marker identifying the myocardium. | 10-02-2008 |
20080285720 | Method and device for determining a position of a part of a medical instrument - The invention relates to a method and a device for determining the position of a part of a medical instrument with an x-ray sensitive sensor in a plane of an x-ray image using an x-ray facility having an x-ray beam source and a device, which is assigned to the beam source and influences the x-ray radiation emitted by the x-ray beam source, wherein a spatial region, in which the medical instrument is located, is scanned with x-ray radiation and at the same time x-ray radiation is detected with the x-ray-sensitive sensor with the device for influencing the x-ray radiation rotating at constant speed, the rotation being synchronized to the receipt of signals based on x-ray radiation with the x-ray-sensitive sensor and with the position of the part of the medical instrument in the plane of an x-ray image being determined based on the x-ray radiation detected with the x-ray-sensitive sensor. | 11-20-2008 |
20090010516 | THREE-DIMENSIONAL (3D) RECONSTRUCTION OF THE LEFT ATRIUM AND PULMONARY VEINS - A method for centering a left atrium and pulmonary veins at an isocenter of an imaging device is provided. The method includes positioning an injection catheter at a bifurcation of a pulmonary artery; obtaining an anterior or posterior flouroscopic image of area including and/or surrounding the left atrium and pulmonary veins; and moving the imaging device, patient support, or the combination thereof, such that the injection catheter and a spine of a patient are displayed in the fluoroscopic image. | 01-08-2009 |
20090034817 | Method for correction of truncation artifacts in a reconstruction method for tomographic imaging with truncated projection data - There is described a method for correction of truncation artifacts in reconstructed tomographic images in a reconstruction method for tomographic images with truncated projection image data in the reconstructed tomographic images, in which divergent radiation is emitted from a radiographic source, an object to be examined is x-rayed with the divergent radiation in different projection directions, the radiation penetrating through the object to be examined is detected by a detector as projection images, with the data of the signal being arranged in a number of projection data rows and projection images detected by the detector being expanded line-by-line through extrapolation of the projection data rows. In this case the signal of a projection data row can be smoothed with a polynomial filter to reduce the noise component of the signal and the truncated proportion of the projection data row can be computed from the smoothed signal of the projection data row by means of an extrapolation method, with the extrapolation widths being derived from a number of rows. | 02-05-2009 |
20090092225 | Method for the three-dimensional representation of a moving structure by a tomographic method - The invention relates to a method for a three-dimensional representation of a moving structure by a tomographic method, in which during one recording pass a series of projection recordings is registered by an imaging unit at different recording angles between a start position and an end position, it being possible to reconstruct three-dimensional image data from the projection recordings with the following steps: a) generation of tomosynthesis projection recordings along a tomosynthesis scanning path; b) interpolation of the data of the tomosynthesis projection recordings in accordance with an interpolation algorithm in order to generate a projection data set; c) use of a tomosynthesis reconstruction method on the projection data set in order to generate a tomosynthesis volume image; d) repetition of steps b) and c) for all times of interest, and e) display of tomosynthesis representations from the tomosynthesis volume images. | 04-09-2009 |
20090092308 | SYSTEM AND METHOD OF AUTOMATIC ESTIMATION OF ARTERIAL INPUT FUNCTION FOR EVALUATION OF BLOOD FLOW - A system and method of determining hemodynamic parameters of a patient is described. A background image data set is obtained prior to the administration of a contrast agent. A series of image data sets is obtained during the first passage of the bolus through a parenchymal volume. The pre-contrast-agent image is subtracted from image data sets obtained during the first passage of the contrast agent bolus, so that the amount of contrast agent in the volume may be determined. The time series of the amount of contrast agent is computed to determine the arterial input function (AIF) which may be used to determine a tissue impulse response, and hemodynamic parameters such as cerebral blood flow (CBF), cerebral blood volume (CBV) and mean transit time (MTT). | 04-09-2009 |
20090205403 | Calibration of an instrument location facility with an imaging apparatus - A method is proposed for calibrating an instrument location facility with an imaging apparatus. The instrument location apparatus and the imaging apparatus are synchronized temporally with one another. According to such synchronization at least three points of the position of a medical instrument relative to a tracking coordinate system of the instrument location apparatus and/or relative to an image coordinate system of the imaging apparatus are measured simultaneously both by the instrument location apparatus and by the imaging apparatus. The instrument and/or the imaging apparatus are moved relative to one another between the measurements. The measured points parameterize a predetermined transformation rule for mapping the tracking coordinate system onto the image coordinate system. | 08-20-2009 |
20090252287 | Operating method for a swiveling polyplanar imaging system for time-resolved imaging of an object being examined - An operating method for a polyplanar imaging system for time-resolved imaging of an object is provided. First and second data records are recorded at a fan angle β from different angular positions by a first and second imaging planes arranged at an offset angle γ relative to each other and swiveled through an angle of at least φ=180°+β. A third data record is created by selecting projection images from the first data record beginning from a starting angle α and from the second data record so that the third data record covers an angular range of at least φ. Three-dimensional images are reconstructed based on the third data record. The starting angle α is varied for continuously creating the third data record until α has attained its final value. The contrast of projection images in the third data record or of three-dimensional images is evaluated. | 10-08-2009 |
20090252378 | Operating method for an imaging system for the time-resolved mapping of an iteratively moving examination object - The invention relates to an operating method for an imaging system for the time-resolved mapping of an iteratively moving examination object. First recordings of the object are generated by the imaging system from various angles while simultaneously recording a phase signal. Multiple static 3D-image data sets corresponding to a sequence of defined phases are reconstructed from the first recordings. Three-dimensional motion fields are calculated from the 3D-image data sets, by which two 3D-image data sets are mapped onto one another. Second recordings of the object are generated by the imaging system from various angles while simultaneously recording a phase signal. 3D-image data sets from the second recordings in a previously determined reference phase of the phase signal using the motion fields is generated which is a sequence of motion-compensated 3D-image data sets. | 10-08-2009 |
20090326373 | Method for assisting with percutaneous interventions - The present invention relates to a method for assisting with percutaneous interventions, wherein 2D x-ray images of an object region are recorded before the intervention using a C-arm x-ray system or a robot-based x-ray system at different projection angles and 3D x-ray image data of the object region is reconstructed from the 2D x-ray recordings. One or more 2D or 3D ultrasound images are recorded before and/or during the intervention using an external ultrasound system and registered with the 3D image data. The 2D or 3D ultrasound images are then overlaid with the 3D image data record or a target region segmented therefrom or displayed next to one another in the same perspective. The method allows a puncture or biopsy to be monitored with a low level of radiation. | 12-31-2009 |
20100014629 | Method and apparatus for setting a dynamically adjustable position of an imaging system - The invention relates to a method and an apparatus for setting a dynamically adjustable position of an imaging system for providing an optimum view onto a moving object during a medical intervention. A time-resolved at least three-dimensional data record of the moving object is generated. A position of the imaging system for each period of time is determined from the time-resolved data record from which the optimum view onto a structure of interest of the moving object is produced and automatically setting a calculated position of the imaging system in real-time so that the optimum view onto the structure of interest can be shown at any time. Optionally prior to determining the position of the imaging system, a structure of interest of the moving object can be segmented with this structure being segmented for each period of time from the time-resolved data record. | 01-21-2010 |
20100016712 | Method and Device for Visually Assisting a Catheter Application - A method and a device for visually assisting a catheter application on the heart of a patient using an image of the patient obtained by a C-arm X-ray device and using electroanatomical mapping data of the patient obtained by an electromagnetic position detection system and mapping system. The C-arm X-ray device and the electromagnetic position detection system and mapping system are calibrated in relation to each other, by determining a co-ordinate transformation between a co-ordinate system assigned to the C-arm x-ray device and/or a co-ordinate system assigned to the image generated by the C-arm X-ray device and a co-ordinate system assigned to the electromagnetic position detection system and mapping system. The position of the patient is determined during the detection of the image and/or during the detection of the electroanatomic mapping-data and is at least indirectly assigned to the image and/or the electroanatomic mapping-data. | 01-21-2010 |
20100020926 | METHOD FOR REPRESENTING INTERVENTIONAL INSTRUMENTS IN A 3D DATA SET OF AN ANATOMY TO BE EXAMINED AS WELL AS A REPRODUCTION SYSTEM FOR PERFORMING THE METHOD - The invention relates to a method for presenting interventional instruments in a 3D data set of an anatomy to be treated. A 3D data set of the anatomy is recorded before introduction of an interventional instrument. Once the interventional instrument has been applied, the spatial position of the instrument is determined by x-ray fluoroscopy from images created at two different angulations. A 3D model of the instrument is formed from the x-ray images. The 3D model of the instrument is fused with the 3D data set of the anatomy. A 3D hologram is reproduced from the fused 3D data set. The 3D hologram is repeatedly reproduced in real time to follow the application of the instrument in the presentation. | 01-28-2010 |
20100027751 | Method for the production of angiography recordings - The invention relates to a method for the production of angiography recordings. First, a mask image is recorded with a first modality. A contrast medium is injected after the first recording. A control image is recorded with a second modality after the injection of the contrast medium. A spreading of the contrast medium is determined based on the images and the control of subsequent recordings is analyzed. A recording criterion is checked to determine whether the recording criterion has been achieved. If it has not been achieved, the control image is repeatedly recorded for repeatedly determining the spreading of the contrast medium. If it has been achieved, a contrast image is recorded with the first modality and the mask image and the contrast image are processed and analyzed. | 02-04-2010 |
20100049011 | Mapping Catheter as Well as Mapping Catheter Apparatus and Associated Method - The invention relates to a mapping catheter for determination of data of an area of an organ embodied as a flat surface, especially of the heart, to be presented graphically, with at least one thermosensor essentially aligned in the direction of the longitudinal axis of the mapping catheter for determination of temperature-related data which is arranged at a tip of the mapping catheter being provided in the distal area of the mapping catheter for introduction into the organ. | 02-25-2010 |
20100104164 | Method and device for obtaining a volume data set of a mobile tissue or organ of a patient - A method and a device for obtaining a volume data set of a mobile tissue or organ of a patient by a C-arm X-ray device are provided. An electromagnetic sensor of a position detection system is arranged indirectly on the tissue or organ. The X-ray device obtains a plurality of X-ray projections from the tissue or organ from various projection directions. A first method consists of reconstructing a volume data set from the X-ray projections, in which the electromagnetic sensor adopts a position characterizing a displacement phase of the tissue or organ. A second method consists of reconstructing a volume data set from the X-ray projections captured when the electromagnetic sensor was located in a position characterizing a displacement phase of the tissue or organ. A third method does not capture an X-ray projection for the reconstruction if the electromagnetic sensor is located in a position characterizing a displacement phase. | 04-29-2010 |
20100239148 | Method and System for Automatic Aorta Segmentation - A method and system for aorta segmentation in a 3D volume, such as a C-arm CT volume is disclosed. The aortic root is detected in the 3D volume using marginal space learning (MSL) based segmentation. The aortic arch is detected in the 3D volume using MSL based segmentation. The ascending aorta is tracked from the aortic root to the aortic arch in the 3D volume, and the descending aorta is tracked from the aortic arch in the 3D volume. | 09-23-2010 |
20100272315 | Automatic Measurement of Morphometric and Motion Parameters of the Coronary Tree From A Rotational X-Ray Sequence - Automatic measurement of morphometric and motion parameters of a coronary target includes extracting reference frames from input data of a coronary target at different phases of a cardiac cycle, extracting a three-dimensional centerline model for each phase of the cardiac cycle based on the references frames and projection matrices of the coronary target, tracking a motion of the coronary target through the phases based on the three-dimensional centerline models, and determining a measurement of morphologic and motion parameters of the coronary target based on the motion. | 10-28-2010 |
20100329534 | METHOD AND DEVICE FOR THE ACQUISITION OF X-RAY IMAGES FOR A THREE-DIMENSIONAL IMAGE RECONSTRUCTION - A method and an X-ray image acquisition system for the acquisition of X-ray images of a region of interest of an examination object from a multiplicity of angles of view for an 3-D image reconstruction are provided. The X-ray image acquisition system comprises an X-ray focus and an X-ray detector, which can be separately positioned and oriented relative to each other. The X-ray focus is moved along a combination of straight line segments and/or arc segments for the acquisition of X-ray images. The X-ray detector is oriented relative to the X-ray focus and moved in such a way that the region of interest is projected completely onto the X-ray detector upon each image acquisition. | 12-30-2010 |
20110046725 | METHOD OF IMAGING FOR HEART VALVE IMPLANT PROCEDURE - A method as a workflow for imaging for a heart valve implant procedure includes positioning the patient and an articulated imaging apparatus relative to one another, inducing rapid ventricular pacing in the patient, and imaging a region of the patient's heart to obtain image date for a three-dimensional image. The three-dimensional data is used to construct a three-dimensional image of the region of the patient's heart an the three-dimensional image is displayed for use in the implanting of the replacement heart valve. Optional steps may include obtaining a real time two-dimensional image of the patient's heart and superimposing the real time two-dimensional image with the constructed three dimensional image. The replacement valve is moved into position in the patient's heart during rapid ventricular pacing and breath hold using the superimposed two-dimensional and three-dimensional image information. | 02-24-2011 |
20110052026 | Method and Apparatus for Determining Angulation of C-Arm Image Acquisition System for Aortic Valve Implantation - A method and system for determining an angulation of a C-arm image acquisition system for aortic valve implantation is disclosed. One or more landmarks of the aortic root is detected in a 3D image. A plane representing an aortic annulus direction is defined in the 3D image based on the detected anatomic landmarks. A viewing angle is determined that is perpendicular to the defined plane. | 03-03-2011 |
20110075794 | Method and Device for Generating a Three-Dimensional X-Ray Imaging - A method is provided for quickly and simply generating a three-dimensional tomographic x-ray imaging. Tomosynthetic projection images are recorded from different recording angles along a tomosynthetic scanning path and three-dimensional image data is reconstructed from the tomosynthetic projection images. The tomosynthetic projection images are recorded by a tomosynthetic x-ray device with a plurality of x-ray sources arranged on a holder at a distance from one another. Each projection image is recorded by a different x-ray source being fixed in one place during recording the tomosynthetic projection images. | 03-31-2011 |
20110075798 | Method for correcting truncated projection data - A method for correcting truncated projection data of a rotation for a reconstruction technique for computed tomography scans with truncated projection data in the computed tomography images produced by a C-arm is proposed. At least one truncated projection is recorded. The truncated portions prior to acquisition of the rotation for the at least one truncated projection is captured. The truncated projection and the truncated portions are assembled into at least one complete projection. Truncated projection data is acquired during the rotation. The truncated data is estimated based on a model of the patient geometry from the at least one complete projection. A reconstruction technique is performed on the basis of the acquired and the estimated data. | 03-31-2011 |
20110075804 | X-ray imaging method and x-ray imaging system - A method for recording an x-ray image with an x-ray imaging system having an x-ray source and an x-ray detector is provided. The x-ray source has a plurality of x-ray emitters arranged alongside one another. Each x-ray emitter is assigned to a part area of the x-ray detector. The x-ray beam generated by the x-ray emitter is collimated onto the assigned part area. A first x-ray emitter is activated for emitting a first x-ray beam onto a first part area and image data of the first part area is read out. Subsequently a further x-ray emitter for emitting a further x-ray beam onto a further part area of is activated and image data of the further part area is read out. The steps are repeated until image data for all part areas of the x-ray detector is read out. The read out image data is combined into an x-ray image. | 03-31-2011 |
20110075809 | METHOD AND DEVICE FOR RECORDING A PROJECTION DATASET OF AN OBJECT USING A PLURALITY OF X-RAY SOURCES - A method for recording a projection dataset of a object to be recorded using a plurality of X-ray sources is provided, which X-ray sources are spaced apart from one another on average by an angle α relative to an isocenter. A plurality of projection images from different recording directions are recorded in succession while activating the corresponding X-ray sources. Two X-ray sources are activated in succession having a spacing of at least 2 α relative to the isocenter. | 03-31-2011 |
20110075814 | MEDICAL X-RAY ACQUISITION SYSTEM - A medical x-ray acquisition system has an x-ray source and an x-ray detector, the x-ray source having at least one field emission radiator with at least one field emission cathode. The field emission cathode can be formed by a nanostructured material with carbon nanotubes. | 03-31-2011 |
20110085637 | Reconstruction of 3D image datasets from x-ray and cone-beam data - A method for producing a 3D image dataset of an object with an imaging system having an x-ray source and an x-ray detector is provided. A series of two-dimensional arrays of cone beam data from the detector is acquired while the source moves along a substantially planar trajectory around the object. The trajectory is described by a series of source points serially numbered by a counter parameter. The cone beam data is differentiated with respect to the counter parameter at a fixed ray direction to produce a derivative of the cone beam data. The derivative is filtered with a Hilbert-like filter to produce filtered cone beam data. The acquired or the filtered cone beam data is multiplied with a redundancy weighting function. The cone beam data is back-projected to reconstruct a 3D image dataset. | 04-14-2011 |
20110096964 | Method and System for Automatic Extraction of Personalized Left Atrium Models - A method and system for automatic extraction of personalized left atrium models is disclosed. A left atrium chamber body is segmented from a 3D image volume. At least one pulmonary venous ostium is detected on the segmented left atrium chamber body. At least one pulmonary vein trunk connected to the left atrium chamber body is segmented based on the detected pulmonary venous ostia. | 04-28-2011 |
20110096969 | Method and System for Shape-Constrained Aortic Valve Landmark Detection - A system and method for performing shape-constrained aortic valve landmark detection using 3D medical images is provided. A rigid global shape defining initial positions of a plurality of aortic valve landmarks is detected within a 3D image. Each of the plurality of aortic valve landmarks is detected based on the initial positions. | 04-28-2011 |
20110153286 | Method and System for Virtual Percutaneous Valve Implantation - A method and system for virtual percutaneous valve implantation is disclosed. A patient-specific anatomical model of a heart valve is estimated based on 3D cardiac medical image data and an implant model representing a valve implant is virtually deployed into the patient-specific anatomical model of the heart valve. A library of implant models, each modeling geometrical properties of a corresponding valve implant, is maintained. The implant models maintained in the library are virtually deployed into the patient specific anatomical model of the heart valve to select an implant type and size and deployment location and orientation for percutaneous valve implantation. | 06-23-2011 |
20110164035 | METHOD OF MOTION COMPENSATION FOR TRANS-CATHETER AORTIC VALVE IMPLANTATION | 07-07-2011 |
20110170663 | MEDICAL X-RAY IMAGING SYSTEM - In order to achieve improved image quality in X-ray photographs, a medical X-ray imaging system, comprising a flat, planar X-ray source having a surface with X-ray focal points arranged adjacent to one another and an X-ray detector with a sensor surface, is provided. The X-ray source has a plurality of field emission guns with at least one field emission cathode and the surface with focal points of the X-ray source is larger in size than the sensor surface of the X-ray detector. | 07-14-2011 |
20110222750 | SYSTEM AND METHOD FOR GUIDING TRANSCATHETER AORTIC VALVE IMPLANTATIONS BASED ON INTERVENTIONAL C-ARM CT IMAGING - A method for guiding transcatheter aortic valve implantations includes receiving an interventional 3D image of an aortic root reconstructed from a sequence of 2D images acquired from a C-arm computed tomography (CT) system being rotated about a patient through a predetermined number of degrees, segmenting the aortic root and detecting aortic root landmarks in the 3D image, where the aortic root landmarks include three lowest points of aortic root cusps, two coronary artery ostia, and three commissures points where the cusps meet, cropping an area inside the segmented aortic root out of the 3D volume for volume rendering, centering the 3D image on an intersection of two orthogonal planes, each containing the two detected coronary ostia, that are orthogonal to a plane spanned by three lowest points of the aortic root cusps, and volume rendering the 3D cropped aortic root image together with the detected landmarks onto a 2D image. | 09-15-2011 |
20110268341 | Method for Reconstruction of a Current Three-Dimensional Image Dataset of an Object During a Monitoring Process and X-Ray Device - A method for reconstruction of an actual three-dimensional image dataset of an object during a monitoring process is proposed. Two-dimensional. X-ray projection images which correspond to a recording geometry are continuously recorded from different projection angles. The three-dimensional image dataset are reconstructed from a first number of these projection images, especially by a back projection method. The proportion of the oldest projection image contained in the current three-dimensional image dataset is removed from the three-dimensional image dataset and the proportion of the actual projection image is inserted in the three-dimensional image dataset after each recording of the actual projection image. | 11-03-2011 |
20110274335 | Method for recording and reconstructing a three-dimensional image dataset and x-ray apparatus - A method for recording and reconstructing a three-dimensional image dataset is proposed. A plurality of projection images are acquired under different recording geometries in relation to an object to be recorded by an X-ray apparatus, in particular a C-arm X-ray apparatus. At least two projection images are recorded for at least one recording geometry, in particular for every recording geometry. The three-dimensional image dataset is reconstructed from the project images. | 11-10-2011 |
20120069017 | Method and System for Efficient Extraction of a Silhouette of a 3D Mesh - A method and system for extracting a silhouette of a 3D mesh representing an anatomical structure is disclosed. The 3D mesh is projected to two dimensions. Silhouette candidate edges are generated in the projected mesh by pruning edges and mesh points based on topology analysis of the projected mesh. Each silhouette candidate edge that intersects with another edge in the projected mesh is split into two silhouette candidate edges. The silhouette is extracted using an edge following process on the silhouette candidate edges. | 03-22-2012 |
20120087563 | Method and System for Intraoperative Guidance Using Physiological Image Fusion - A method and system for intraoperative guidance in an off-pump mitral valve repair procedure is disclosed. A plurality of patient-specific models of the mitral valve are generated, each from pre-operative image data obtained using a separate imaging modality. The pre-operative image data from the separate imaging modalities are fused into a common coordinate system by registering the plurality of patient-specific models. A model of the mitral valve is estimated in real-time in intraoperative image data using a fused physiological prior resulting from the registering of the plurality of patient-specific models. | 04-12-2012 |
20120123250 | Method and System for Pigtail Catheter Motion Prediction - A method and system for autoregressive model based pigtail catheter motion prediction in a fluoroscopic image sequence is disclosed. Parameters of an autoregressive model are estimated based on observed pigtail catheter tip positions in a plurality of previous frames of a fluoroscopic image sequence. A pigtail catheter tip position in a current frame of the fluoroscopic image sequence is predicted using the fitted autoregressive model. The predicted pigtail catheter tip position can be used to constrain pigtail catheter tip detection in the current frame. The predicted pigtail catheter tip position may also be used to predict abnormal motion in the fluoroscopic image sequence. | 05-17-2012 |
20120136243 | METHOD FOR CALCULATING PERFUSION DATA - A method for calculating perfusion data, such as blood volume or blood flow from 2-D angiography data or DSA sequences, is proposed. An angiography scene is recorded using specific acquisition parameters to generate the 2-D angiography data or DSA sequences with administration of contrast agent based on a multiplicity of individual angiography images. A region of interest is defined suitable for comparison purposes. The volume segments are defined by the region of interest. The time/contrast curve is determined in the volume segments. Perfusion data for calculating the relative perfusion data is ascertained. The perfusion data is compared and the relative perfusion data is calculated. The calculated relative perfusion data is not specified in terms of absolute physical quantities, but is provided simply as ratios, such as left/right or before/after. | 05-31-2012 |
20120189185 | Method and System for 3D Cardiac Motion Estimation from Single Scan of C-Arm Angiography - A method and system for estimating 3D cardiac motion from a single C-arm angiography scan is disclosed. An initial 3D volume is reconstructed from a plurality of 2D projection images acquired in a single C-arm scan. A static mesh is extracted by segmenting an object in the initial 3D volume. The static mesh is projected to each of the 2D projection images. A cardiac phase is determined for each of the 2D projection images. A deformed mesh is generated for each of a plurality of cardiac phases based on a 2D contour of the object and the projected mesh in each of the 2D projection images of that cardiac phase. | 07-26-2012 |
20120230568 | Method and System for Model-Based Fusion of Multi-Modal Volumetric Images - A method and system for fusion of multi-modal volumetric images is disclosed. A first image acquired using a first imaging modality is received. A second image acquired using a second imaging modality is received. A model and of a target anatomical structure and a transformation are jointly estimated from the first and second images. The model represents a model of the target anatomical structure in the first image and the transformation projects a model of the target anatomical structure in the second image to the model in the first image. The first and second images can be fused based on estimated transformation. | 09-13-2012 |
20120230570 | Method and System for Multi-Part Left Atrium Segmentation in C-Arm Computed Tomography Volumes Using Shape Constraints - A method and system for multi-part left atrium (LA) segmentation in a C-arm CT volume is disclosed. Multiple LA part models, including an LA chamber body mesh, an appendage mesh, a left inferior pulmonary vein (PV) mesh, a left superior PV mesh, a right inferior PV mesh, and a right superior PV mesh, are segmented in a | 09-13-2012 |
20120238866 | Method and System for Catheter Tracking in Fluoroscopic Images Using Adaptive Discriminant Learning and Measurement Fusion - A method and system for adaptive discriminant learning and measurement fusion for image based catheter tracking is disclosed. An adaptive discriminant model is trained online based on a tracked object, such as a pigtail catheter tip, in at least one previous frame of a fluoroscopic image sequence. The object is tracked in the current frame of the fluoroscopic image sequence based at least on the adaptive discriminant model trained online. The object may be tracked in the current frame based on a fusion of three types of measurement models including the adaptive discriminant model trained online, an object detection model trained offline, and an online appearance model. | 09-20-2012 |
20120275656 | METHOD FOR SUPPLYING A 3D X-RAY IMAGE DATA RECORD FOR A MOVING OBJECT WITH HIGHLY ABSORBENT MATERIAL - A method is provided for supplying a 3D X-ray image data record for a moving object. The said object contains highly X-ray radiation-absorbent material. A correction is made in respect of the highly absorbent material in 2D forward projections obtained from a 3D-X-ray image data record. The forward projections are calculated using 3D motion fields, which are derived from original 2D X-ray image data records. | 11-01-2012 |
20120296196 | Method for assisting a person performing a minimally invasive intervention with a catheter involving a puncture of a septum and x-ray device - A method for assisting a person performing a minimally invasive intervention with a catheter involving a puncture of a septum, in particular of a heart, is proposed. A three-dimensional image data record is recorded showing an anatomical structure in the region of the septum. An item of septum information showing the position of the septum is determined in the image data record and additional information is derived from the position of the anatomical structure influencing or showing the selection of a puncture site. During the intervention, the fluoroscopic images of the region are continuously recorded and a current fluoroscopic image is displayed and superimposed with the septum information and/or the additional information based on a registration of the image data record with the fluoroscopic images. | 11-22-2012 |
20120296202 | Method and System for Registration of Ultrasound and Physiological Models to X-ray Fluoroscopic Images - A method and system for registering ultrasound images and physiological models to x-ray fluoroscopy images is disclosed. A fluoroscopic image and an ultrasound image, such as a Transesophageal Echocardiography (TEE) image, are received. A 2D location of an ultrasound probe is detected in the fluoroscopic image. A 3D pose of the ultrasound probe is estimated based on the detected 2D location of the ultrasound probe in the fluoroscopic image. The ultrasound image is mapped to a 3D coordinate system of a fluoroscopic image acquisition device used to acquire the fluoroscopic image based on the estimated 3D pose of the ultrasound probe. The ultrasound image can then be projected into the fluoroscopic image using a projection matrix associated with the fluoroscopic image. A patient specific physiological model can be detected in the ultrasound image and projected into the fluoroscopic image. | 11-22-2012 |
20120307964 | System for Medical Imaging Using Long Persistence Contrast Agents - A system acquires images in the presence of a contrast agent of relatively long persistence using a synchronization processor, image acquisition device and imaging controller. The synchronization processor provides an image acquisition trigger signal for acquiring images at a particular point within both a cardiac and a respiratory cycle in response to signals representing cardiac and respiratory cycles. The image acquisition device includes an assembly comprising a radiation emitter and detector rotatable about a patient for acquiring images of a portion of patient anatomy at different angles. The imaging controller initiates acquisition of data representing multiple images in the presence of a contrast agent of relatively long persistence by repetitively, initiating rotation of the assembly to an angle, acquiring an image at the angle in response to the trigger signal and incrementally increasing the angle. | 12-06-2012 |
20130004040 | LEFT VENTRICLE EPICARDIUM ESTIMATION IN MEDICAL DIAGNOSTIC IMAGING - The left ventricle epicardium is estimated in medical diagnostic imaging. C-arm x-ray data is used to detect an endocardium at different phases. The detected endocardium at the different phases is compared to sample endocardiums at different phases. The sample endocardiums have corresponding sample epicadriums. The transformation between the most similar sample endocardium or endocardiums over time and the detected endocardium over time is applied to the corresponding sample epicardium or epicardiums. The transformed sample epicardium over time is the estimated epicardium over time for the C-arm x-ray data. | 01-03-2013 |
20130004052 | SUBTRACTION OF PROJECTION DATA IN MEDICAL DIAGNOSTIC IMAGING - Background information is subtracted from projection data in medical diagnostic imaging. The background is removed using data acquired in a single rotational sweep of a C-arm. The removal may be by masking out a target, leaving the background, in the data as constructed into a volume. For subtraction, the masked background information is projected to a plane and subtracted from the data representing the plane. | 01-03-2013 |
20130034201 | APPARATUS FOR X-RAY IMAGING FOR PROJECTION RADIOGRAPHY AND COMPUTED TOMOGRAPHY, AND METHOD FOR X-RAY IMAGING - An X-ray imaging apparatus has at least one X-ray image system rotatable about an examination volume. The X-ray image system is controlled such that during a continuous rotation of the system, at least one 2D projection image is recorded. An image generation facility generates the 2D projection image from the measured data. The X-ray source includes an X-ray focus which can be changed in terms of position, which, during the recording of the 2D projection image, moves counter to the direction of rotation of the X-ray image system such that its spatial position in a fixed coordinate system does not change. The X-ray detector records several 2D partial images, from which the 2D projection image is calculated with the rotational movement of the X-ray detector being at least approximately compensated. The 2D projection images have significantly reduced image blur. | 02-07-2013 |
20130129170 | Method and System for Precise Segmentation of the Left Atrium in C-Arm Computed Tomography Volumes - A method and system for multi-part left atrium (LA) segmentation in a C-arm CT volume is disclosed. Multiple LA part models, including an LA chamber body mesh, an appendage mesh, a left inferior pulmonary vein (PV) mesh, a left superior PV mesh, a right inferior PV mesh, and a right superior PV mesh, are segmented in a 3D volume. A volume mask is generated from the LA chamber mesh, the appendage mesh, and the PV meshes. Erosion is performed in the LA chamber body and a plurality of ostia regions in the volume mask. The plurality of ostia regions in the volume mask are refined using region growing, and a smooth mesh is fit to each ostia region. A consolidated LA mesh is generated from the volume mask and the parts of the LA mesh are relabeled in the ostia region based on part boundaries detected using an optimization approach. | 05-23-2013 |
20130129172 | COMPUTED-TOMOGRAPHY SYSTEM AND METHOD FOR DETERMINING VOLUME INFORMATION FOR A BODY - A tomogram of a body is provided. Projection-image data obtained by a radiation-based projection method is used for providing the tomogram. Initial voxel data are first specified for a plurality of voxels of the body. Synthetic projection-image data are generated based upon a projection rule modeling a course of the projection method. Projection-error data is determined by comparing the synthetic projection-image data with the real projection-image data. The projection-error data are imaged on the basis of a back-projection rule dependent on the projection rule so that voxel-error data are produced. Correction data is generated from the voxel-error data by a gradient-based optimizing algorithm, wherein corrected voxel data are generated using the correction data. | 05-23-2013 |
20130129174 | Method and System for Model-Based Fusion of Computed Tomography and Non-Contrasted C-Arm Computed Tomography - A method and system for model-based fusion of multi-modal volumetric images is disclosed. A first patient-specific model of an anchor anatomical structure is detected in a first medical image acquired using a first imaging modality, and a second patient-specific model of the anchor anatomical structure is detected in a second medical image acquired using a second imaging modality. A weighted mapping function is determined based on the first patient-specific model of the anchor anatomical structure and the second patient-specific model of the anchor anatomical structure using learned weights to minimize mapping error with respect to a target anatomical structure. The target anatomical structure from the first medical image to the second medical image using the weighted mapping function. In an application of this model-based fusion to transcatheter valve therapies, the trachea bifurcation is used as the anchor anatomical structure and the aortic valve is the target anatomical structure. | 05-23-2013 |
20130279780 | Method and System for Model Based Fusion on Pre-Operative Computed Tomography and Intra-Operative Fluoroscopy Using Transesophageal Echocardiography - A method and system for model-based fusion of pre-operative image data and intra-operative fluoroscopic images is disclosed. A fluoroscopic image and an ultrasound image are received. The ultrasound image is mapped to a 3D coordinate system of a fluoroscopic image acquisition device used to acquire the fluoroscopic image. Contours of an anatomical structure are detected in the ultrasound image, and a transformation is calculated between the ultrasound image and a pre-operative CT image based on the contours and a patient-specific physiological model extracted from the pre-operative CT image. A final mapping is determined between the CT image and the fluoroscopic image based on the transformation between the ultrasound image and physiological model and the mapping of the ultrasound image to the 3D coordinate system of the fluoroscopic image acquisition device. The CT image or the physiological model can then be projected into the fluoroscopic image. | 10-24-2013 |
20130279825 | MOTION COMPENSATED OVERLAY - A method for displaying a motion compensated overlay includes receiving a model of a structure of interest, capturing an image depicting a region of interest and an instrument, determining whether the structure of interest is visible in the image, registering the model of the structure of interest to the image upon determining that the structure of interest is visible, and combining the model of the structure of interest with the image according to a registration to determine an overlay image. | 10-24-2013 |
20130294667 | Method and System for Pericardium Based Model Fusion of Pre-operative and Intra-operative Image Data for Cardiac Interventions - A method and system for model based fusion pre-operative image data, such as computed tomography (CT), and intra-operative C-arm CT is disclosed. A first pericardium model is segmented in the pre-operative image data and a second pericardium model is segmented in a C-arm CT volume. A deformation field is estimated between the first pericardium model and the second pericardium model. A model of a target cardiac structure, such as a heart chamber model or an aorta model, extracted from the pre-operative image data is fused with the C-arm CT volume based on the estimated deformation field between the first pericardium model and the second pericardium model. An intelligent weighted average may be used improve the model based fusion results using models of the target cardiac structure extracted from pre-operative image data of patients other than a current patient. | 11-07-2013 |
20140024932 | Computation of Hemodynamic Quantities From Angiographic Data - Methods for computing hemodynamic quantities include: (a) acquiring angiography data from a patient; (b) calculating a flow and/or calculating a change in pressure in a blood vessel of the patient based on the angiography data; and (c) computing the hemodynamic quantity based on the flow and/or the change in pressure. Systems for computing hemodynamic quantities and computer readable storage media are described. | 01-23-2014 |
20140112438 | METHOD AND SYSTEM FOR OBTAINING A SEQUENCE OF X-RAY IMAGES USING A REDUCED DOSE OF IONIZING RADIATION - Methods, systems, and apparatus for obtaining a sequence of x-ray images are disclosed. An object of interest in a first x-ray image is detected and an area of interest, based on a predicted motion of the object of interest, is determined. A second x-ray image of the area of interest is acquired using spatial x-ray modification to control an x-ray to pass through a portion of a patient corresponding to the area of interest. | 04-24-2014 |