Patent application number | Description | Published |
20080317342 | Method for segmenting structures in image data records and image processing unit for carrying out the method - In the method according to at least one embodiment of the invention, a first segmentation of a structure in an image data record is firstly carried out, and a first final segmentation result is obtained therefrom. A region in the image data record is selected based on the first final segmentation result obtained. A first band is placed at a first, outwardly pointing distance from the selected region. This first band characterizes a background region. A second band is placed at a second, inwardly pointing distance from the projected first final segmentation result of the first segmentation. This second band characterizes a structure region. A further segmentation is carried out based on the characterized background region and the characterized structure region, and the final segmentation result of the further segmentation is saved and/or displayed. Furthermore, an image processing unit for carrying out the method is disclosed. | 12-25-2008 |
20080317351 | Method for interactively segmenting structures in image data records and image processing unit for carrying out the method - In the method according to at least one embodiment of the invention, an image data record having a structure to be segmented is first of all displayed by display equipment. Using an input apparatus, a segmentation algorithm to be used is selected from a group of different segmentation algorithms, including a contour-based segmentation algorithm, a region-based segmentation algorithm and manual segmentation, based on the local image contrast in a region to be segmented in the image data record. A region to be segmented in the image data record is marked, and the structure to be segmented in the marked region is segmented using the selected segmentation algorithm, and a segmentation result of the segmentation is displayed. This procedure (selecting a segmentation algorithm/marking a region/segmenting the region/displaying) is repeated until the structure to be segmented is completely segmented in the displayed image data record and a boundary line of the structure is produced as the final segmentation result. Lastly, the final segmentation result is saved and/or displayed. Furthermore, an image processing unit is disclosed for carrying out the method of at least one embodiment. | 12-25-2008 |
20090202121 | METHOD FOR CONTROLLING AN IMAGE DATA ACQUISITION AND/OR EVALUATION PROCEDURE IN MEDICAL EXAMINATIONS - In a method to control the acquisition and/or evaluation procedure of image data in medical examinations, in a previously acquired planning image data set entirely or partially covering a target volume, spatial information of the target volume is determined automatically using a statistical model of the target volume based on data about real anatomy. The acquisition and/or evaluation operation is controlled using the spatial information. A statistical model of at least one greyscale value distribution in the region of the surface of the target volume is used to calculate the location information. | 08-13-2009 |
20100002921 | MEDICAL IMAGE ACQUISITION APPARATUS AND OPERATING METHOD THEREFOR - In a medical image acquisition device, and a method for operating such a device, before acquiring a current planning image data set from a subject, a statistical atlas is generated that is a statistical compilation concerning at least one part of the human body, the statistical compilation including an average image data set electronically associated, in the statistical atlas, with association information that identifies anatomy of the human body represented by the statistical compilation. The statistical atlas is compiled from multiple planning image data sets acquired using a specific measurement protocol. After the current planning image data set is acquired, the stored average image data set is transformed into the current planning image data set, so that the association information associated with the average image data set are accurately also associated with the current planning image data set. A diagnostic image acquisition of the subject is then controlled using the association information that is now associated with the current planning image data set. | 01-07-2010 |
20110015904 | Model based estimation of a complete or partial positron emission tomography attenuation map using maximum likelihood expectation maximization - Example embodiments are directed to a method of correcting attenuation in a magnetic resonance (MR) scanner and a positron emission tomography (PET) unit. The method includes acquiring PET sinogram data of an object within a field of view of the PET unit. The method further includes producing an attenuation map based on a maximum likelihood expectation maximization (MLEM) of a parameterized model instance and the PET sinogram data. | 01-20-2011 |
20110080168 | CORRECTION OF TRUNCATIONS IN MR IMAGING - A method is disclosed for correction of truncations of an image of an object under examination in the reconstruction of image data from raw data which has been recorded with a magnetic resonance system from a field of view of the magnetic resonance system, with an object under examination which is located in the field of view of the magnetic resonance system being imaged in the raw data, and with the image recorded by the raw data of the object under examination being truncated at the edge of the field of view if at least one part of the object under examination is located outside the field of view. In at least one embodiment, the method includes determining a number of one-dimensional projections of the imaged field of view in the Radon space from the recorded raw data in order to obtain a projection profile of the image object under examination over the field of view in each case; checking each projection profile for whether the projection profile exhibits a truncation which is caused by the at least one part of the object under examination being located outside the field of view; if the respective checked projection profile exhibits a truncation, expanding the projection profile for correcting the truncation in that the projection profile is extrapolated in accordance with a predetermined extrapolation model in the area in which it exhibits the truncation; and reconstructing image data based on the expanded projection profiles in which the truncation of the image of the object under examination is corrected. | 04-07-2011 |
20110187364 | DETERMINING A POSITION OF A SUBAREA OF AN OBJECT UNDER EXAMINATION AND THE STRUCTURE THEREOF IN A MAGNETIC RESONANCE SYSTEM - A method is disclosed for determining a location of a subarea of an area under examination in a magnetic resonance system. The subarea is arranged at the edge of a field-of-view of the magnetic resonance system. In at least one embodiment of the method, at least one slice position is determined for an MR image in which the B | 08-04-2011 |
20110303835 | Method For Determining Radiation Attenuation By An Examination Object In A Positron Emission Tomography Scanner - A method is disclosed for determining radiation attenuation by an examination object in a positron emission tomography scanner. In at least one embodiment of the method, an initial segmentation of the examination object is fixed, wherein an attenuation coefficient is assigned to each segment of the segmentation. Furthermore, raw radiation data about the examination object arranged in the positron emission tomography scanner is acquired, and a correction factor is automatically determined for each pixel with the aid of an optimization method, in which the probability of the acquired raw radiation data is maximized taking into account the segmentation and the attenuation coefficients assigned to the segments. A statistical parameter of the correction factors is then determined for each segment and the segmentation is corrected by subdividing a segment as a function of the statistical parameter determined for the segment. Finally, a segment correction factor is determined for each segment from the correction factors assigned to the segment and the attenuation coefficients assigned to the segments are corrected as a function of the segment correction factors. | 12-15-2011 |
20110304335 | Method For Determining The Radiation Attenuation Of A Local Coil - A method is disclosed for determining radiation attenuation by a local coil in a tomography scanner of a magnetic resonance-positron emission tomography system. In at least one embodiment of the method, arrangement-dependent radiation attenuation, which depends on a coil-arrangement parameter record, is set for the local coil. Raw radiation data of an examination object is acquired with the aid of the MR-PET system and a plurality of images of the examination object are determined from the raw radiation data. In the process, each image is determined with a different coil-arrangement parameter record, taking into account the arrangement-dependent radiation attenuation. Each image is assigned a cost value, which corresponds to a measure of artifacts in the image. The radiation attenuation by the local coil is determined from the arrangement-dependent radiation attenuation and the coil-arrangement parameter record, which is associated with the optimized cost value, by determining an optimized cost value. | 12-15-2011 |
20110309251 | Method For Determining Radiation Attenuation In A Positron Emission Tomography Scanner - A method is disclosed for determining radiation attenuation as a result of an object in a positron emission tomography scanner. In at least one embodiment, a phantom object is arranged in the positron emission tomography scanner during the method. First raw radiation data of the phantom object is acquired while the object is not arranged in the positron emission tomography scanner. A first image of the phantom object is calculated from the first raw radiation data. The object then is arranged in the positron emission tomography scanner ( | 12-22-2011 |
20120010495 | Method For Generating MR Images And An Appropriately Designed Magnetic Resonance System - An embodiment of the invention relates to the generation of MR images of a volume section within an examination object by way of a magnetic resonance scanner. In at least one embodiment, the following steps are performed: generating at least one of the MR images; automatically performing a number of quality inspections on the at least one MR image; and, should one of these quality inspections fail, an action is automatically performed in order to improve a quality when generating more of the MR images. | 01-12-2012 |
20120040322 | PHANTOM, PARTICULARLY FOR USE IN MR- OR PET-BASED IMAGING METHODS - A phantom, particularly for use in MR- or PET-based imaging methods, includes a hollow base body that delimits an interior volume, wherein the interior volume is subdivided into at least two volume portions by at least one separation element, and wherein the separation element or a section thereof consists of foam. | 02-16-2012 |
20120056621 | Method For Imaging A Portion Of An Examination Object In A Magnetic Resonance Scanner - A method is disclosed for imaging a portion of an examination object in a magnetic resonance scanner. The portion is arranged at the edge of a field of view of the magnetic resonance scanner. During at least one embodiment of the method, a gradient field is produced such that a nonlinearity in the gradient field and a B | 03-08-2012 |
20120235680 | METHOD FOR DETERMINING MAGNETIC RESONANCE DATA - According to an embodiment of a method, a first readout gradient field is determined in such a way that a distortion caused by a non-linearity of the first readout gradient field and a distortion caused by a B | 09-20-2012 |
20120249141 | METHOD FOR CORRECTING A DISTORTION IN A MAGNETIC RESONANCE RECORDING - A method is disclosed for correcting a distortion in a magnetic resonance recording. A distortion indicates a mismatch between a distorted position of an image point in the magnetic resonance recording and an actual position of the image point. According to at least one embodiment of the method, a B | 10-04-2012 |
20120268118 | METHOD FOR CAPTURING MR IMAGE DATA AND CORRESPONDING COMBINED MR/ET FACILITY - MR image data relating to a volume section of an examination object is determined. Image data relating to this volume section is also captured by way of a true-to-original tomographic method. The MR image data is compared with the image data. Depending on the results of this comparison, either the MR image data is corrected such that the MR image data matches the image data as closely as possible, or parameters that are used during the capture of the MR image data are modified such that, when the MR image data of the predefined volume section is captured again using the modified parameters, the newly captured MR image data matches the image data as closely as possible. | 10-25-2012 |
20130057282 | METHOD AND MAGNETIC RESONANCE SYSTEM FOR IMAGING A PARTIAL REGION OF AN EXAMINATION SUBJECT - In a method and magnetic resonance (MR) apparatus to image a partial region of an examination subject by means of a multislice measurement, which partial region includes at least two measurement slices, and is located at least in part at the edge of a field of view of the magnetic resonance apparatus, for each voxel to be optimized that is located at the edge of the field of view, a gradient field is configured for each measurement slice of the partial region that is to be measured and is used to acquire magnetic resonance data in the multislice measurement. The gradient field is configured so as to cause a nonlinearity of the gradient field and a B | 03-07-2013 |
20130082702 | METHOD FOR DETERMINING MAGNETIC RESONANCE DATA AND A MAGNETIC RESONANCE SYSTEM - A method is disclosed for acquiring magnetic resonance (MR) data for a plurality of layers of an object to be examined in a section of a magnetic resonance system having a basic magnetic field, wherein the section is located at the edge of a Field of View of the magnetic resonance system in the first direction. The method includes producing a first gradient field having a non-linearity of its location dependence in such a way that in the section the non-linearity compensates a local inhomogeneity of the basic magnetic field, and then multiple positioning of the object to be examined in a first direction, so the plurality of layers of the object to be examined perpendicular to the first direction successively includes the section. Finally, it includes the acquisition of magnetic resonance data for each of the layers with recording sequences. | 04-04-2013 |
20130154640 | MAGNETIC RESONANCE SYSTEM AND METHOD TO GENERATE A MAGNETIC RESONANCE IMAGE OF AN EXAMINATION SUBJECT - The invention concerns a method to generate an MR image of an examination subject of MR signals of the examination subject being detected with a receiver coil element of a magnetic resonance system. A spatially related sensitivity is determined for the receiver coil element. A mask is generated for the receiver coil element depending on the sensitivity of the receiver coil element in order to therewith mask a region of the MR image, in which region the receiver coil element has at least one predetermined sensitivity. At least one RF excitation pulse and at least one magnetic field gradient are activated to acquire MR data with the receiver coil element, and a preliminary MR image is generated depending on MR data acquired therewith. The mask of the receiver coil element is applied to the preliminary MR image in order to generate an MR image of the receiver coil element, and an MR image of the examination subject is generated from the MR image for the receiver coil element. | 06-20-2013 |
20130197349 | METHOD FOR CALCULATING A VALUE OF AN ABSORPTION PARAMETER IN POSITRON EMISSION TOMOGRAPHY - A method is disclosed for calculating a spatially resolved value of an absorption parameter for a positron emission tomography (PET) scan of an examination object via magnetic resonance tomography (MRT). Magnetic resonance data is acquired within a first region lying within a field of view of a magnetic resonance system and within a second region bordering on the first and lying at the edge of the field of view. The method includes the spatially resolved calculation of a first value of the absorption parameter from the first MR data within the first region and of a second value from the second MR data within the second region. A three-dimensional parameter map is obtained from the first value. This parameter map is extended by the second value such that within the first region and the second region the parameter map has the value of the absorption parameter in spatially resolved form. | 08-01-2013 |
20130237806 | METHOD FOR PERFORMING COMBINED MAGNETIC RESONANCE/POSITRON EMISSION TOMOGRAPHY - A method is disclosed for performing a combined magnetic resonance/positron emission tomography scan of an examination object in an MR/PET system. An embodiment of the method entails acquiring first magnetic resonance data using a first readout gradient field. The first readout gradient field is chosen such that, at a location of the field of view of the magnetic resonance system, a distortion caused by a nonlinearity of the first readout gradient field and a distortion caused by a B | 09-12-2013 |
20130320973 | METHOD OF ATTENUATION CORRECTION OF POSITRON EMISSION TOMOGRAPHY DATA AND COMBINED POSITRON EMISSION TOMOGRAPHY AND MAGNETIC RESONANCE TOMOGRAPHY SYSTEM - Various embodiments relate to a method of attenuation correction of Positron Emission Tomography (PET) data based on Magnetic Resonance Tomography (MRT) data. A method of at least one embodiment further includes determining further data being indicative of an iterative cycle of a physiological observable of a patient and matching the PET data with the MRT data based on the further data. | 12-05-2013 |
20140035577 | MAGNETIC RESONANCE IMAGING COORDINATED WITH A PHYSIOLOGICAL CYCLE - To carry out magnetic resonance (MR) tomography, a physiological parameter of an object to be examined is acquired as a function of time to detect a physiological cycle which repeats itself over time. First MR data is acquired for a first region, wherein all points of the first region are arranged in a region of a field of view of an MR system. Acquisition of the first MR data occurs selectively in first time intervals which are synchronized with the physiological cycle and are separated from each other by waiting intervals. Second MR data is acquired for a second region which adjoins the first region. Acquisition of the second MR data occurs in the waiting intervals between the first time intervals. | 02-06-2014 |
20140037169 | METHOD FOR MOVEMENT-AVERAGED ATTENUATION CORRECTION AND MAGNETIC RESONANCE SYSTEM - Various embodiments relate to a method for the movement-averaged attenuation correction of positron emission tomography data based on magnetic resonance tomography data. In at least one embodiment, the method includes capturing of multiple MRT data respectively in different phases of a cycle of an anatomical disposition of an investigation subject. The method furthermore includes respectively for each of the plurality of MRT data: determination of a value of an attenuation parameter via segmentation and averaging of the determined values of the attenuation parameter in order to obtain an averaged value of the attenuation parameter. The method furthermore includes the execution of attenuation correction of the PET data based on the averaged value of the attenuation parameter. | 02-06-2014 |
20140153806 | MR SCAN SELECTION FOR PET ATTENUATION CORRECTION - A method of attenuation correction for a positron emission tomography (PET) system includes obtaining PET scan data representative of a volume scanned by the PET system, obtaining a plurality of magnetic resonance (MR) scan data sets representative of the volume, each MR scan data set being acquired in a respective time period during acquisition of the PET scan data by the PET system, detecting motion of the volume that occurred during the acquisition of the PET scan data based on an assessment of the plurality of MR scan data sets, the PET scan data, or the plurality of MR scan data sets and the PET scan data, determining attenuation correction data from the plurality of MR scan data sets based on the detected motion for alignment of the attenuation correction data and the PET scan data, and correcting the PET scan data with the attenuation correction data. | 06-05-2014 |
20140221817 | METHOD FOR GENERATING ATTENUATION CORRECTION FOR A COMBINED MAGNETIC RESONANCE-POSITRON EMISSION TOMOGRAPHY DEVICE - A method, a computer program product and a computer readable storage medium are disclosed for generating a global attenuation map used for attenuation correction of positron emission tomography image data sets in a combined magnetic resonance-positron emission tomography device. In an embodiment, during the course of detecting hardware components of the combined magnetic resonance-positron emission tomography device and determining positions of the detected hardware components relative to a patient support, the global attenuation map is generated as a function of the detected hardware components. | 08-07-2014 |
20140243653 | MOTION-CORRECTED PET IMAGES - A method is disclosed for generating a motion-corrected PET image of an examination area in a combined MR-PET system. In an embodiment, the method includes recording PET events from the examination area in a first recording time frame; recording a number of MR images of the examination area in at least the first recording time frame; calculating an at least two-dimensional movement information of the examination area on the basis of the number of MR images, wherein the movement information describes the movement information of the examination area during the first recording time frame, and determining the motion-corrected PET image from the PET events using the calculated movement information. | 08-28-2014 |
20140296697 | METHOD FOR DISPLAYING SIGNAL VALUES OF A COMBINED MAGNETIC RESONANCE POSITRON EMISSION TOMOGRAPHY DEVICE AND A CORRESPONDINGLY EMBODIED MAGNETIC RESONANCE POSITRON EMISSION TOMOGRAPHY DEVICE - A method, a computer program product and a computer-readable storage medium are disclosed for displaying signal values of a combined magnetic resonance positron emission tomography device. In at least one embodiment, the spatial correspondence of signal values, which result from a magnetic resonance measurement, and of signal values, which result from a positron emission tomography measurement, are used and the corresponding signal values are arranged in matrix form and displayed graphically as a multi-dimensional scatter plot. | 10-02-2014 |
20140306704 | METHOD FOR IMAGING A PART REGION OF AN EXAMINATION OBJECT IN A MAGNETIC RESONANCE SYSTEM - A method is disclosed for imaging a part region of an examination object in a magnetic resonance system. In an embodiment, a first and second gradient field are respectively created such that, at a respective first and second position at the edge of the field of view, a distortion caused by a non-linearity of the respective first and second gradient field, and a distortion caused by a B | 10-16-2014 |
20140336498 | MEDICAL IMAGING SYSTEM HAVING A MAGNETIC RESONANCE IMAGING UNIT AND A POSITRON EMISSION TOMOGRAPHY UNIT - A medical imaging system includes a magnetic resonance imaging unit including a magnet unit and a patient receiving area surrounded by the magnet unit, wherein the magnet unit includes a main magnet, a gradient coil unit and a radio-frequency antenna unit. In at least one embodiment, the medical imaging system further includes a positron emission tomography unit including at least two positron emission tomography detector modules. The at least two positron emission tomography detector modules each include a detector surface. Further, the radio-frequency antenna unit is disposed outside an area disposed between an examination area and the detector surfaces. | 11-13-2014 |
20140336499 | METHOD FOR CREATING A DETAILED ATTENUATION VALUE MAP FOR A LIMITED BODY REGION - A method, medical imaging device and computer program product are disclosed for creating a detailed attenuation value map for a limited body region of a patient for a positron emission tomography examination. In an embodiment, the method includes an acquisition of first attenuation value data from a first attenuation value measurement of the limited body region; an ascertainment of at least one mean attenuation value based upon the first attenuation value data for the limited body region; an acquisition of second attenuation value data from a second attenuation value measurement of the limited body region; an ascertainment of local correction values based upon the second attenuation value data for the limited body region; and a determination of the detailed attenuation value map for the limited body region based upon the at least one mean attenuation value and based upon the local correction values. | 11-13-2014 |
20140375316 | METHOD AND APPARATUS TO GENERATE MAGNETIC RESONANCE IMAGE DATA OF AN EXAMINATION SUBJECT - In the magnetic resonance image data acquisition and apparatus, raw magnetic resonance data are acquired at multiple points along a trajectory in k-space from first and second magnetic resonance echo signals caused by a radio-frequency excitation pulse. The course of the trajectory in k-space is established by adjusting a magnetic field value of a gradient magnetic field. The gradient magnetic field has a field value of a first point in time of the trajectory curve and a subsequently modified and at a layer second point in time, the gradient magnetic field has the same field value as that said first point in time. The second point in time is before or during the acquisition of the raw magnetic resonance data of the first magnetic resonance echo signal. The shift value for the trajectory is determined and the trajectory is shifted according to this shift value, and an image is reconstructed from the shifted raw magnetic resonance data of the trajectory. | 12-25-2014 |
20150023575 | Anatomy Aware Articulated Registration for Image Segmentation - Disclosed herein is a framework for facilitating image processing. In accordance with one aspect, the framework receives first image data acquired by a first modality and one or more articulated models. The one or more articulated models may include at least one section image acquired by the first modality and aligned with a local image acquired by a second modality. The framework may align an anatomical region of the first image data with the section image and non-rigidly register a first region of interest extracted from the section image with a second region of interest extracted from the aligned anatomical region. To generate a segmentation mask of the anatomical region, the registered first region of interest may be inversely mapped to a subject space of the first image data. | 01-22-2015 |
20150025359 | METHOD FOR EVALUATION AND COMPARISON OF A CHRONOLOGICAL SEQUENCE OF COMBINED MEDICAL IMAGING EXAMINATIONS AND ALSO A MEDICAL IMAGING SYSTEM WHICH IS DESIGNED FOR EXECUTING THE INVENTIVE METHOD - A method is disclosed for evaluating and comparing a chronological sequence of at least two combined medical imaging examinations, wherein a combined medical imaging examination is carried out in each case by way of a first imaging apparatus and by way of a second imaging apparatus which is formed by a Positron Emission Tomography apparatus. On the basis of the image data captured by the first imaging apparatus, a transformation specification is created and this is applied to the image data captured by the Positron Emission Tomography apparatus, so that a direct comparison of the first and second image data captured by way of the Positron Emission Technology apparatus is made possible. | 01-22-2015 |
20150051476 | METHOD FOR AN EVALUATION OF FIRST IMAGE DATA OF A FIRST IMAGING EXAMINATION AND SECOND IMAGE DATA OF A SECOND IMAGING EXAMINATION AND ALSO A MEDICAL IMAGING SYSTEM WHICH IS DESIGNED FOR CARRYING OUT THE METHOD - A method is disclosed for an evaluation of first image data of a first imaging examination and second image data of a second imaging examination on a patient. In an embodiment, the method includes a provision of first image data of the first imaging examination captured by way of a first imaging apparatus; a provision of second image data of the second imaging examination captured by way of a second imaging apparatus; a determination of first dynamic data on the basis of the first image data as a function of a time; a determination of second dynamic data on the basis of the second image data as a function of a time; and a determination of correlated data of a correlation of the first dynamic data with the second dynamic data. | 02-19-2015 |