Artifact reduction in true-FISP imaging of the coronary arteries by adjusting imaging frequency
Artifact reduction in true-FISP imaging of the coronary arteries by adjusting imaging frequency
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DOI：
10.1002/mrm.10442
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发表时间：
2003-05-01
影响因子：
3.3
通讯作者：
Li, DB
中科院分区：
文献类型：
--
作者：
Deshpande, VS;Shea, SM;Li, DB
共振频率偏移的存在经常会导致使用稳态进动真快速成像(TRUE-FISP)获取的图像中出现伪影。谐振偏移量的一个来源是合成器频率的次优设置。这项工作的目的是证明，改变合成器频率可以最大限度地减少TRUE-FISP中与非共振相关的图像伪影。发展了一种简单的侦察方法来估计感兴趣体积(VOI)的最佳合成器频率。为了改善脂肪抑制，还开发了一种类似的侦察方法来确定脂肪饱和脉冲的最佳频率偏移。使用3D TRUE-FISP序列对健康受试者进行冠状动脉成像，以验证频率校正的有效性。通过使用由侦察扫描估计的水和脂肪频率，可以观察到图像伪影的显著减少和脂肪抑制的改善。频移是利用TRUE-FISP改善冠状动脉成像的一种有用和实用的方法。(C)2003年Wiley-Liss，Inc.
The presence of resonance frequency offsets often causes artifacts in images acquired with true fast imaging with steady-state precession (true-FISP). One source of resonance offsets is a suboptimal setting of the synthesizer frequency. The goal of this work was to demonstrate that shifting the synthesizer frequency could minimize the off-resonance related image artifacts in true-FISP. A simple scouting method was developed to estimate the optimal synthesizer frequency for the volume of interest (VOI). To improve fat suppression, a similar scouting method was also developed to determine the optimal frequency offset for the fat saturation pulse. Coronary artery imaging was performed in healthy subjects using a 3D true-FISP sequence to validate the effectiveness of the frequency corrections. Substantial reduction in image artifacts and improvement in fat suppression were observed by using the water and fat frequencies estimated by the scouting scans. Frequency shifting is a useful and practical method for improving coronary artery imaging using true-FISP. (C) 2003 Wiley-Liss, Inc.