Method and system of MR imaging with reduced FSE cusp artifacts
First Claim
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1. An MR imaging system comprising:
- a plurality of gradient coils positioned about a bore of a main magnet and configured to impress gradient fields;
an RF coil assembly having a plurality of coil elements;
an RF transceiver controlled by a pulse module to transmit RF pulses via the RF coil assembly and receive MR signals; and
a controller programmed to;
determine a coil sensitivity at an imaging volume and a coil sensitivity at a gradient field null for each of the plurality of coil elements;
input MR signals acquired by the plurality of coil elements;
determine magnetization values from the MR signals, using the coil sensitivities at the imaging volume, the coil sensitivities at the gradient field null, and an artifact function; and
reconstruct an image based on the magnetization values.
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Abstract
Coil sensitivity of a receive coil to a gradient null location is measured and, from the measurements, a coil calibration value is determined and used to modify the MR data acquired with that receive coil to reduce the adverse effects of gradient nulling on MR images. Coil sensitivity values are determined for each coil of a coil array and the data for each coil is respectively weighted. An image that is substantially free of gradient null artifacts or ghosting is then reconstructed from the weighted data.
20 Citations
24 Claims
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1. An MR imaging system comprising:
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a plurality of gradient coils positioned about a bore of a main magnet and configured to impress gradient fields; an RF coil assembly having a plurality of coil elements; an RF transceiver controlled by a pulse module to transmit RF pulses via the RF coil assembly and receive MR signals; and a controller programmed to; determine a coil sensitivity at an imaging volume and a coil sensitivity at a gradient field null for each of the plurality of coil elements; input MR signals acquired by the plurality of coil elements; determine magnetization values from the MR signals, using the coil sensitivities at the imaging volume, the coil sensitivities at the gradient field null, and an artifact function; and reconstruct an image based on the magnetization values. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of magnetic resonance (MR) imaging comprising:
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executing a parallel imaging sequence to obtain MR data; correcting the MR data for artifacts caused by a gradient null region; and reconstructing and displaying an image from the corrected MR data. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A non-transitory computer-readable storage medium having a set of instructions stored thereon which, when executed by a computer, cause the computer to:
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obtain multi-channel MR data indicative of apparent magnetization values in a field of view (FOV); separate the multi-channel MR data indicative of the apparent magnetization values into generally correctly-encoded magnetization values and a gradient null artifact signal; reconstruct a set of image data, with reduced gradient null artifacts, from the generally correctly-encoded magnetization values and store the set of image data in a memory. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification