Patent application number | Description | Published |
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 |
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 |
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 |
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 |
20100290685 | FUSION OF 3D VOLUMES WITH CT RECONSTRUCTION - A method for registration of ultrasound device in three dimensions to a C-arm scan, the method including acquiring a baseline volume, acquiring images in which the ultrasound device is disposed, locating the device within the images, registering the location of the device to the baseline volume, acquiring an ultrasound volume from the ultrasound device, registering the ultrasound volume to the baseline volume, and performing fusion imaging to display a view of the ultrasound device in the baseline volume. | 11-18-2010 |
20100316278 | HIGH-RESOLUTION THREE-DIMENSIONAL MEDICAL IMAGING WITH DYNAMIC REAL-TIME INFORMATION - A computer-implemented method, a device, a system and a computer program are disclosed for three-dimensional displaying of medical body structures within the framework of a medical procedure, in particular cardiac surgery, wherein movement information is derived from a dynamic image of a body structure to be examined. In at least one embodiment, movement information is derived from vector analysis. After acquiring a static image of the respective body structure, vector analysis is applied to the static image to derive a modified static image with movement information of the body structure. The static image can then be displayed after it has moved. | 12-16-2010 |
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 |
20110164035 | METHOD OF MOTION COMPENSATION FOR TRANS-CATHETER AORTIC VALVE IMPLANTATION | 07-07-2011 |
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 |
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 |
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 |
20120128226 | AUTOMATIC DETECTION OF CONTRAST INJECTION - A method for automatically detecting the presence of contrast in an x-ray image includes acquiring an x-ray image prior to administration of contrast. A background image is estimated based on the x-ray image. The contrast is administered. A set of x-ray images is acquired. The background image is subtracted from the set of images. Image intensity is determined for each of the subtracted images. The subtracted images having highest image intensity are selected. A predefined shape model is fitted to the selected subtracted images. The fitting of the predefined shape model is used to fit the shape model to each of the subtracted images. A feature value is calculated for each image frame based on pixel intensities of each pixel fitted to the shape model for the corresponding subtracted image. An image frame of peak contrast is determined by selecting the image frame with the greatest feature value. | 05-24-2012 |
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 |
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 |
20130011030 | Method and System for Device Detection in 2D Medical Images - A method and system for device detection in a 2D medical image is disclosed. In order to account for shape variation of a 3D object in a 2D imaging plane, a hierarchical tree-structured array of trained classifiers is used to detect a 3D object, such as a pigtail catheter in a 2D medical image, such as a fluoroscopic image. The hierarchical tree-structured array of trained classifiers increases a dimensionality of the search space with each hierarchical level, and as the search space is increased, the classification is split into object sub-classes using trained classifiers independently trained for each sub-class. | 01-10-2013 |
20130023766 | METHOD AND X-RAY DEVICE FOR TEMPORAL UP-TO-DATE REPRESENTATION OF A MOVING SECTION OF A BODY, COMPUTER PROGRAM PRODUCT AND DATA CARRIER - A computer-implemented method for temporal up-to-date representation of a moving section of a body is provided. A first x-ray image data record is provided containing the moving section in a specific movement phase and a first 2D x-ray image and a 3D x-ray image superimposed and registered with one another. 2D x-ray images are repeatedly recorded each containing the moving section. 3D ultrasound images are repeatedly recorded each containing the moving section. Extended 2D x-ray images are created from the 2D x-ray images using the first x-ray images data record. The 3D ultrasound images are used as intermediaries for movement correction. The extended 2D images are displayed. | 01-24-2013 |
20130057569 | 2D-2D FUSION FOR INTERVENTIONAL GUIDANCE IN TRANS-CATHETER AORTIC VALVE IMPLANTATION - A method for fusing 2D fluoroscopic images with 2D angiographic images for real-time interventional procedure guidance includes using a 2-dimensional angiographic image to detect injection of a contrast agent into an anatomical structure, where the contrast agent first appears in a detected image frame, subtracting a background image from the detected image frame and binarizing the subtracted image frame to segment the anatomical structure from the subtracted image frame, registering the segmented anatomical structure with a predefined shape model of the anatomical structure to generate an anatomical mask, generating an anatomical probability map from the anatomical mask using intensity information from the subtracted image frame, where the anatomical probability map expresses a probability of a pixel in the subtracted image frame belonging to the anatomical structure, and fusing the angiographic image with one or more subsequently acquired 2-dimensional fluoroscopic images of the anatomical structure using the anatomical probability map. | 03-07-2013 |
20130195323 | System for Generating Object Contours in 3D Medical Image Data - An image data processor processes 3D mesh data to identify an object boundary by, identifying for a first line segment between first and second points of the mesh, third and fourth points lying either side of the line segment, the first, second and third points comprising a first triangle and the first, second and fourth points comprising a second triangle. The image data processor determines a first normal vector for the first triangle and a second normal vector for the second triangle, determines a third normal vector perpendicular to a display screen, determines a first product of the first and third vectors and a second product of the second and third vectors and identifies the first line segment as a potential segment of the object boundary in response to the sign of the first and second products. | 08-01-2013 |
20130259341 | IMAGE FUSION FOR INTERVENTIONAL GUIDANCE - A method for real-time fusion of a 2D cardiac ultrasound image with a 2D cardiac fluoroscopic image includes acquiring real time synchronized US and fluoroscopic images, detecting a surface contour of an aortic valve in the 2D cardiac ultrasound (US) image relative to an US probe, detecting a pose of the US probe in the 2D cardiac fluoroscopic image, and using pose parameters of the US probe to transform the surface contour of the aortic valve from the 2D cardiac US image to the 2D cardiac fluoroscopic image. | 10-03-2013 |
20150015582 | METHOD AND SYSTEM FOR 2D-3D IMAGE REGISTRATION - A method of 2D-3D image registration is presented. The method includes accessing a two dimensional image of a subject having an object therein, accessing a three dimensional image data of the subject with the object f, generating a plurality of mesh models from the three dimensional image data, wherein the plurality of mesh models comprise a first mesh model having a first attenuation coefficient and a second mesh model having a second attenuation coefficient, rendering the first mesh model and the second mesh model with a projection geometry of the two dimensional image to obtain a resultant image, iteratively comparing the resultant image with the two dimensional image using a similarity measure, and registering the two dimensional image with the resultant image. | 01-15-2015 |