Patent application number | Description | Published |
20110208039 | Direct and Indirect Surface Coil Correction for Cardiac Perfusion MRI - Method of correcting cardiac perfusion MR imaging for inhomogeneities ( | 08-25-2011 |
20120076380 | SYSTEM AND METHOD FOR BACKGROUND PHASE CORRECTION FOR PHASE CONTRAST FLOW IMAGES - A method for correcting the background phase in magnetic resonance phase contrast flow images includes providing a time series of velocity encoded magnetic resonance images of a patient, where the time series of velocity encoded images comprises for each time point a phase contrast image where a pixel intensity is proportional to a flow velocity, measuring a change of intensity for each pixel over the time series of phase contrast images, identifying pixels with a low measure of temporal change as stationary pixels, and calculating a correction field for the stationary pixels, where the correction field represents a background phase to be subtracted from the phase contrast image. | 03-29-2012 |
20120076382 | MOTION TRACKING FOR CLINICAL PARAMETER DERIVATION AND ADAPTIVE FLOW ACQUISITION IN MAGNETIC RESONANCE IMAGING - A method for clinical parameter derivation and adaptive flow acquisition within a sequence of magnetic resonance images includes commencing an acquisition of a sequence of images. One or more landmarks are automatically detected from within one or more images of the sequence of images. The detected one or more landmarks are propagated across subsequent images of the sequence of images. A plane is fitted to the propagation of landmarks. The positions of landmarks or alternatively the position of the fitted plane within the sequence of images is used for derivation of clinical parameters such as tissue velocities and/or performing adaptive flow acquisitions to measure blood flow properties. | 03-29-2012 |
20120078085 | Method of Analysis for Dynamic Magnetic Resonance Perfusion Imaging | 03-29-2012 |
20120087561 | INTERACTION METHOD FOR REGIONS OF-INTEREST IN TIME SERIES IMAGES - A method for identifying a region of interest within a time sequence of images includes acquiring a time sequence of images comprising a plurality of image frames. Image segmentation is performed to segment a region of interest (ROI) from within each of the plurality of image frames of the time sequence of images. Manual edits are received for the ROI within one or more of the plurality of image frames. The manual edits are propagated to other image frames of the plurality of images. An extent to which each of the manual edits are propagated to other image frames is dependent upon a transformation function or deformation field used to propagate the manual edits and a weighing factor that is influenced by a distance in time between the other image frames and the frames that have been manually edited. | 04-12-2012 |
20120121153 | Method and System for Retrospective Image Combination Under Minimal Total Deformation Constrain for Free-Breathing Cardiac Magnetic Resonance Imaging With Motion Correction - A method and system for retrospective image combination for free-breathing magnetic resonance (MR) images is disclose. A free-breathing cardiac MR image acquisition including a plurality of frames is received. A key frame is selected of the plurality of frames. A deformation field for each frame to register each frame with the key frame. A weight is determined for each pixel in each frame based on the deformation field for each frame under a minimum total deformation constraint. A combination image is then generated as a weighted average of the frames using the weight determined for each pixel in each frame. | 05-17-2012 |
20120121154 | Method and System for Propagation of Myocardial Infarction from Delayed Enhanced Cardiac Imaging to Cine Magnetic Resonance Imaging Using Hybrid Image Registration - A method and system for propagation of myocardial infarction from delayed enhanced magnetic resonance imaging (DE-MRI) to cine MRI is disclosed. A reference frame is selected in a cine MRI sequence. Deformation fields are calculated within the cine MRI sequence to register the frames of the cine MRI sequence to the reference frame. A DE-MRI image having an infarction region is registered to the reference frame of the cine MRI sequence. The DE-MRI image may be registered to the infarction region using a hybrid registration algorithm that unifies both intensity and feature points into a single cost function. Infarction information in the DE-MRI image is then propagated cardiac phases of the frames in the cine MRI sequence based on the registration of the DE-MRI image to the reference frame and the plurality of deformation fields calculated within the cine MRI sequence. | 05-17-2012 |
20120121200 | Symmetric and Inverse-Consistent Deformable Registration - A method for symmetric and inverse-consistent registration of a pair of digital images includes calculating a first update of a forward transformation of a first digital image to a second digital image from a previous update of the forward transformation and a gradient of a cost function of the first and second digital images, calculating a first update of a backward transformation of the second digital image to the first digital image from an inverse of the first update of the forward transformation, calculating a second update of the backward transformation from first update of the backward transformation and the gradient of a cost function of the second and first digital images, and calculating a second update of the forward transformation from an inverse of the second update of the backward transformation. | 05-17-2012 |
20120177269 | Detection of Landmarks and Key-frames in Cardiac Perfusion MRI Using a Joint Spatial-Temporal Context Model - A method including receiving an image sequence, wherein the image sequence includes a plurality of two-dimensional (2D) image frames of an organ arranged in a time sequence; constructing a three-dimensional (3D) volume by stacking a plurality of the 2D image frames in time order; detecting a best bounding box for a target of interest in the 3D volume, wherein the best bounding box is specified by a plurality of parameters including spatial and temporal information contained in the 3D volume; and determining the target of interest from the best bounding box. | 07-12-2012 |
20120189183 | Automatic Registration of Image Series with Varying Contrast Based on Synthetic Images Derived from Intensity Behavior Model - A method for performing motion compensation in a series of magnetic resonance (MR) images includes acquiring a set of MR image frames spanning different points along an MR recovery curve. A motion-free synthetic image is generated for each of the acquired MR image frames using prior knowledge pertaining to an MR recovery curve. Each of the acquired MR images is registered to its corresponding generated synthetic images. Motion within each of the acquired MR image is corrected based on its corresponding generated synthetic image that has been registered thereto. | 07-26-2012 |
20120235679 | MOTION COMPENSATED MAGNETIC RESONANCE RECONSTRUCTION IN REAL-TIME IMAGING - Magnetic resonance reconstruction includes motion compensation. Inverse-consistent non-rigid registration is used to determine motion between shots. The motion is incorporated into reconstruction. The incorporation compensates for the motion resulting from the period over which the MR data is acquired. | 09-20-2012 |
20130027037 | SELF CONSISTENT PARALLEL IMAGING WITH TEMPORAL SENSITIVITY ESTIMATION IN REAL-TIME MAGNETIC RESONANCE IMAGING - Parallel imaging magnetic resonance reconstruction is performed with temporal sensitivity. Rather than estimate the coil sensitivity once for each coil of an array, the coil sensitivity at different times is estimated. The movement of the patient may result in different sensitivities at different times. By using the time varying sensitivity in iterative, self-consistent, non-linear parallel imaging, real-time imaging may be provided with stable artifacts in view of increasing SNR even with higher reduction factors (e.g., 4-6). | 01-31-2013 |
20130272591 | PHASE SENSITIVE T1 MAPPING IN MAGNETIC RESONANCE IMAGING - Phase sensitive T1 mapping is provided in magnetic resonance (MR). The phase from samples of a modified Look-Locker inversion recovery sequence may be used to normalize contrast, allowing for accurate motion registration without extra information acquisition. The sign may be estimated, allowing T1 mapping with a single application of a non-linear fit. | 10-17-2013 |
20130278256 | SELF-CONSTRAINT NON-ITERATIVE GRAPPA RECONSTRUCTION WITH CLOSED-FORM SOLUTION - Parallel magnetic resonance imaging (pMRI) reconstruction techniques are commonly used to reduce scan time by undersampling the k-space data. In GRAPPA, a k-space based pMRI technique, the missing k-space data are estimated by solving a set of linear equations; however, this set of equations does not take advantage of the correlations within the missing k-space data. All k-space data in a neighborhood acquired from a phased-array coil are correlated. The correlation can be estimated easily as a self-constraint condition, and formulated as an extra set of linear equations to improve the performance of GRAPPA. We propose a modified k-space based pMRI technique call self-constraint GRAPPA (SC-GRAPPA) which combines the linear equations of GRAPPA with these extra equations to solve for the missing k-space data. Since SC-GRAPPA utilizes a least-squares solution of the linear equations, it has a closed-form solution that does not require an iterative solver. | 10-24-2013 |
20130278259 | METHOD FOR A RAPID DETERMINATION OF SPATIALLY RESOLVED MAGNETIC RESONANCE RELAXATION PARAMETERS IN AN AREA OF EXAMINATION - In a method for a rapid determination of spatially resolved magnetic resonance relaxation parameters in an area of examination, a preparation pulse is radiated into the area of examination. During the relaxation of the longitudinal magnetization, spatially encoded magnetic resonance signals are acquired at a minimum of two different points in time using a fast magnetic resonance sequence. At each inversion time, an image data record is reconstructed from the magnetic resonance signals, which are elastically registered to each other. From the recorded image data records, values of magnetic resonance relaxation parameters are spatially accurately determined. | 10-24-2013 |
20130289912 | EIGEN-VECTOR APPROACH FOR COIL SENSITIVITY MAPS ESTIMATION - A method for estimating a coil sensitivity map for a magnetic resonance (MR) image includes providing ( | 10-31-2013 |
20140088899 | EIGEN-VECTOR APPROACH FOR COIL SENSITIVITY MAPS ESTIMATION - A method for estimating a coil sensitivity map for a magnetic resonance (MR) image includes providing a matrix A of sliding blocks of a 3D image of coil calibration data, calculating a left singular matrix V | 03-27-2014 |