Improved harmonic phase myocardial strain maps
Improved harmonic phase myocardial strain maps
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DOI：
10.1002/mrm.1286
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发表时间：
2001-11-01
影响因子：
3.3
通讯作者：
Heethaar, RM
中科院分区：
文献类型：
--
作者：
Kuijer, JPA;Jansen, E;Heethaar, RM
磁共振标记在心肌变形的量化方面也被证明是有价值的。然而，耗时的后处理阻碍了该技术在临床常规中的应用。近年来，谐波相位（HARP）技术被引入到从标记图像中自动计算心肌应变图。本研究比较了单标记图像（SPAMM）和减标记图像（CSPAMM）计算的HARP瞬时应变图。性能是量化使用模拟图像的一个不可压缩的圆柱体在“收缩期结束”状态与真实的图像对比度和噪声。在相同的对比噪声比下，SPAMM的第二主拉伸比误差为0.009 +/- 0.032（平均+/- SID）， CSPAMM的第二主拉伸比误差为0.007 +/- 0.016。此外，用体内应变图说明了方法之间的差异。从CSPAMM图像中计算出的图像显示出较少的伪影，并且对HARP带通滤波器中截止频率的选择不太敏感。该方法成为实用的先决条件是，CSPAMM图像应在单次屏气中获得。(C) 2001 Wiley-Liss, Inc。
Magnetic resonance tagging has proven a valuable too[ in the quantification of myocardial deformation. However, time-consuming postprocessing has discouraged the use of this technique in clinical routine. Recently, the harmonic phase (HARP) technique was introduced for automatic calculation of myocardial strain maps from tagged images. In this study, a comparison was made between HARP instantaneous strain maps calculated from single tagged images (SPAMM) and those calculated from subtracted tagged images (CSPAMM). The performance was quantified using simulated images of an incompressible cylinder in the 'end-systolic' state with realistic image contrast and noise. The error in the second principal stretch ratio was 0.009 +/- 0.032 (mean +/- SID) for the SPAMM acquisition, and 0.007 +/- 0.016 for CSPAMM at identical contrast-to-noise ratio. Furthermore, differences between the methods were illustrated with in vivo strain maps. Those calculated from CSPAMM images showed fewer artifacts and were less sensitive to the choice of cut-off frequencies in the HARP band-pass filter. A prerequisite for the method to become practical is that the CSPAMM images should be acquired in a single breathhold. (C) 2001 Wiley-Liss, Inc.