Three dimensional digital subtraction magnetic resonance angiography with limited k-space mask
First Claim
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1. A method for producing a contrast enhanced NMR image with an MRI system that performs a pulse sequence which samples a region of k-space, the steps comprising:
- a) acquiring a mask NMR data set by performing the pulse sequence to sample only a central portion of said k-space;
b) acquiring an NMR image data set by performing the pulse sequence to sample said central portion of said k-space and a peripheral portion of said k-space;
c) producing a difference data set by subtracting the mask NMR data set from the image NMR data set; and
d) reconstructing the NMR image from the difference data set.
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Abstract
A dynamic MRA study of a subject is performed using a 3D fast gradient-recalled echo pulse sequence. The frame rate of the resulting series of reconstructed images is increased by sampling a central region of k-space at a higher rate than the peripheral regions of k-space. A difference image is produced by subtracting a mask formed by central region k-space sampling from a selected image frame formed by central region and peripheral regions k-space sampling.
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4 Claims
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1. A method for producing a contrast enhanced NMR image with an MRI system that performs a pulse sequence which samples a region of k-space, the steps comprising:
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a) acquiring a mask NMR data set by performing the pulse sequence to sample only a central portion of said k-space; b) acquiring an NMR image data set by performing the pulse sequence to sample said central portion of said k-space and a peripheral portion of said k-space; c) producing a difference data set by subtracting the mask NMR data set from the image NMR data set; and d) reconstructing the NMR image from the difference data set. - View Dependent Claims (2, 3, 4)
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