Mayo Foundation for Medical Education and Research

Other

Ge Medical Systems Global Technology Company, LLC

David G Kruger

Stephen J Riederer

Jason Andrew Polzin

Phillip J Rossman

Ananth J Madhuranthakam

Houchun H Hu

Philip J Rossman

MRA data is acquired from an extended field of view by translating the patient through the bore of the MRI system as three-dimensional MRA data sets are acquired and time-resolved images reconstructed. The leading edge of a contrast bolus can be tracked in these images and parameters such as bolus velocity and bolus arrival time can be calculated to provide functional information in addition to anatomical information. Temporal resolution is improved by undersampling peripheral k-space and sampling the center of k-space at a higher temporal rate.

Method for acquiring time-resolved MR images using continuous table motion

MRA data is acquired from a large region of interest by translating the patient through the bore of the MRI system as a three-dimensional MRA data set are acquired. The pulse sequence is altered during the scan to change the lateral FOVof the acquired image to better match the size of the region of interest along its length. Patient table movement is controlled to track a bolus of contrast agent as it passes through the region of interest. A seamless image of the entire region of interest is reconstructed after the acquired data is resampled in regions where the lateral FOVis altered.

Method for acquiring MRI data from variable fields of view during continuous table motion

The present invention includes a method and apparatus to correct for gradient field distortions. The invention is particularly applicable in moving table imaging where a single extended image is desirable. The invention includes acquiring MR data in motion in the presence of gradient non-linearities, transforming the MR data acquired into the image domain, and then applying a warping correction function to the transformed MR data. The warp-corrected MR data is then corrected for motion induced during the MR acquisition. The data may be acquired point-by-point, line-by-line, or another sub-portion of the entire MR data acquired, and processed to minimize the amount of motion correction needed. Based on table velocity or acquisition sequence applied, the data is partitioned based on a common motion correction factor, and after correcting for motion, the data is accumulated to build up a final image.

Gradient non-linearity compensation in moving table MRI

MRA data is acquired from a large region of interest by translating the patient through the bore of the MRI system as a three-dimensional MRA data set are acquired. Patient table movement is controlled to track a bolus of contrast agent as it passes through the region of interest. Fluoroscopic images may be acquired during the scan to enable accurate bolus tracking. A seamless image of the entire region of interest is reconstructed.

Method for acquiring MRI data from a large field of view using continuous table motion

A method for the simultaneous acquisition of data from two transmit/receive 'birdcage' coils is described. The coils are individually RF shielded, making them insensitive to signals generated outside of each coil's volume. Each coil is designed for imaging one leg, and when used together, both legs are imaged simultaneously. In coronal or axial orientations, a small FOV around each leg can be imaged without aliasing. This results in a two-fold scan time reduction compared to a large FOV acquisition with the same spatial resolution.

Simultaneous MR data acquisition with multiple mutually desensitized RF coils

A method for removing artifacts from NMR images in which two NMR data sets S.sub.1 and S.sub.2 for two images of the region of interest are acquired. The correlation of the two data sets S.sub. and S.sub.2 is produced as part of the Fourier transformation image reconstruction process and a corrected image is reconstructed from the result. Modulations which are different in the two NMR data sets S.sub. and S.sub.2 are removed, while common signals produced by stationary structures contribute to the image.

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Nelson, WI, United States of America

David G Kruger