Flow artifacts in steady-state free precession cine imaging
Flow artifacts in steady-state free precession cine imaging
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DOI：
10.1002/mrm.10665
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发表时间：
2004-01-01
影响因子：
3.3
通讯作者：
Edelman, RR
中科院分区：
文献类型：
--
作者：
Storey, P;Li, W;Edelman, RR
稳态自由进动(SSFP)心脏电影图像经常受到暗流伪影的破坏，这通常可以通过重新填充和重新调整扫描仪来消除。根据自旋通过磁场中的非共振点，从理论上解释了这些伪影，并用模体实验验证了该理论。通过将中心频率失谐一半的反向重复时间(Tr)范围内的量，可以在活体内再现伪像。由于这种偏移量在大小上类似于水峰和脂峰之间的频率差，体内伪影的一个可能原因是中心频率被错误地调谐到脂峰而不是水峰。(C)2003年Wiley-Liss，Inc.
Steady-state free precession (SSFP) cardiac cine images are frequently corrupted by dark flow artifacts, which can usually be eliminated by reshimming and retuning the scanner. A theoretical explanation for these artifacts is provided in terms of spins moving through an off-resonant point in the magnetic field, and the theory is validated using phantom experiments. The artifacts can be reproduced in vivo by detuning the center frequency by an amount in the range of half the inverse repetition time (TR). Since this offset is similar in magnitude to the frequency difference between the water and lipid peaks, a likely cause of the artifacts in vivo is that the center frequency is tuned incorrectly to the lipid peak rather than the water peak. (C) 2003 Wiley-Liss, Inc.