Goldfarb James W, Arnold-Anteraper Sheeba
Department of Research and Education, Saint Francis Hospital, Roslyn, New York, USA; Program in Biomedical Engineering, SUNY Stony Brook, Stony Brook, New York, USA.
Magn Reson Med. 2014 Jun;71(6):2096-104. doi: 10.1002/mrm.24879. Epub 2013 Jul 31.
To study balanced steady-state free precession CINE phase-sensitive water-fat separation imaging in four cardiac imaging planes to determine the necessary phase correction and image artifacts particular to this technique.
Ten healthy volunteers and two subjects with known heart pathologies were studied with standard balanced steady-state free precession CINE imaging. Water-only and fat-only images were calculated using sign detection of the real part of the complex image after phase correction with constant and linear terms. Phase correction values were determined using both manual and automated methods. Differences in phase correction values between imaging planes, cardiac phases, coil elements, automated image reconstruction parameters as well as artifact scores between the automated and manual methods were studied with statistical tests.
Water-fat separation performed well in the heart after constant and linear phase correction. Both constant (p = 0.8) and linear x (p = 1) and y (p = 1) phase correction values did not vary significantly across cardiac phases, but varied significantly among the coils (p < 0.001) and imaging planes (p < 0.001). False water-fat separation artifacts were most frequent in the chest/back and also were present at the mitral and aortic valves.
Constant and linear phase correction is necessary to provide consistent results in standard imaging planes using a balanced steady-state free precession water-fat separation postprocessing algorithm applied to standard cardiac CINE imaging.
研究在四个心脏成像平面上的平衡稳态自由进动电影相位敏感水脂分离成像，以确定该技术所需的相位校正和特定的图像伪影。
对10名健康志愿者和2名已知心脏疾病的受试者进行标准的平衡稳态自由进动电影成像研究。在使用常数项和线性项进行相位校正后，通过对复数图像实部的符号检测来计算纯水图像和纯脂肪图像。使用手动和自动方法确定相位校正值。通过统计检验研究成像平面、心脏相位、线圈单元、自动图像重建参数之间的相位校正值差异，以及自动和手动方法之间的伪影评分。
在进行常数和线性相位校正后，心脏中的水脂分离效果良好。常数（p = 0.8）以及线性x（p = 1）和y（p = 1）相位校正值在不同心脏相位之间没有显著差异，但在不同线圈（p < 0.001）和成像平面（p < 0.001）之间存在显著差异。假水脂分离伪影在胸部/背部最为常见，在二尖瓣和主动脉瓣处也有出现。
对于应用于标准心脏电影成像的平衡稳态自由进动水脂分离后处理算法，在标准成像平面中提供一致的结果需要进行常数和线性相位校正。
