B1-mapping and B1L-shimming for MRI
First Claim
Patent Images
1. A method of acquiring MRI image data comprising:
- performing 3-dimensional B1 mapping of a first volume using a first voxel size;
selecting an MRI protocol;
performing B1 shimming using the B1 mapping in accordance with the MRI protocol; and
performing the MRI protocol to acquire MRI imaging data of a second volume using a second voxel size,wherein the first volume is larger than the second volume, and wherein the second volume is contained within the first volume.
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Abstract
The invention relates to a method of acquiring MRI image data comprising the following steps: performing a 3-dimensional B1 mapping of a first volume using a first voxel size, selecting an MRI protocol, performing the B1-shim in accordance with the MRI protocol, performing the MRI protocol to acquire MRI imaging data of a second volume using a second voxel size, wherein the first voxel size is larger than the second voxel size, wherein the first volume is larger than the second volume, and wherein the second volume is contained within the first volume.
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Citations
17 Claims
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1. A method of acquiring MRI image data comprising:
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performing 3-dimensional B1 mapping of a first volume using a first voxel size; selecting an MRI protocol; performing B1 shimming using the B1 mapping in accordance with the MRI protocol; and performing the MRI protocol to acquire MRI imaging data of a second volume using a second voxel size, wherein the first volume is larger than the second volume, and wherein the second volume is contained within the first volume. - View Dependent Claims (3, 4, 5, 6, 7, 16)
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2. A method of acquiring MRI image data comprising:
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performing 3-dimensional B1 mapping of a first volume using a first voxel size, wherein the B1 mapping is performed with an Actual Flip-angle Imaging (AFI) pulse sequence that has a modified gradient timing sequence, gradient pulses of the modified gradient timing sequence having been replaced with Echo Pulse Imaging (EPI) gradient pulses; selecting an MRI protocol; performing B1 shimming in accordance with the MRI protocol; and performing the MRI protocol to acquire MRI imaging data of a second volume using a second voxel size, wherein the first volume is larger than the second volume, and the second volume is contained within the first volume. - View Dependent Claims (17)
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8. An apparatus for acquiring MRI images data comprising:
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means for performing 3-dimensional B1 mapping of a first volume using a first voxel size, means for selecting an MRI protocol, means for performing B1 shimming using the B1 mapping in accordance with said MRI protocol, means for performing the MRI protocol to acquire MRI imaging data of a second volume using a second voxel size, wherein the first voxel size is larger than the second voxel size, and wherein the second volume is contained within the first volume. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification