Reduction of artifacts in susceptibility-weighted MR venography of the brain.

Reduction of artifacts in susceptibility-weighted MR venography of the brain.
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DOI:
10.1002/jmri.21447
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发表时间:
2008-08
影响因子:
4.4
通讯作者:
Du, Yiping P.
Du, Yiping P.
中科院分区:
医学2区
文献类型:
--
作者:
Jin, Zhaoyang;Xia, Ling;Du, Yiping P.

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To reduce the off-resonance artifact in susceptibility weighted imaging (SWI)-based MR venography (MRV) in the brain regions with severe field inhomogeneity and to reduce the signal loss in the minimum-intensity projection (mIP) display of the 3D MRV. A novel post-processing approach was presented to map the local field gradients (LFGs) using the 3D SWI data without phase-unwrapping. LFG measurements were used to assess the severity of field inhomogeneity and suppress the residual phase in the phase mask induced by the off-resonance effect. Volume segmentation of brain tissue was used to reduce the signal loss in the peripheral regions of the brain in the through-plane mIP images and enable in-plane mIP display of MRV. Off-resonance artifact in the brain regions with severe field inhomogeneity was effectively reduced by the LFG-based phase suppression approach. Signal loss was reduced in the through-plane mIP of MRV using volume segmentation of brain tissue prior to projection. In-plane mIP of MRV also became feasible with volume segmentation. Off-resonance artifacts and signal loss in mIP display of MRV can be effectively reduced through post-processing.
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