基于“黑血”技术的标记磁共振图像心肌轮廓估计的精度。
Precision of myocardial contour estimation from tagged MR images with a "black-blood" technique.
作者信息
Croisille P, Guttman M A, Atalar E, McVeigh E R, Zerhouni E A
机构信息
Department of Radiology, Hopital Cardiovasculaire et Pneumologique Louis Pradel, Lyon, France.
出版信息
Acad Radiol. 1998 Feb;5(2):93-100. doi: 10.1016/s1076-6332(98)80128-1.
RATIONALE AND OBJECTIVES
The authors determined whether blood presaturation of tagged magnetic resonance (MR) images affects identification of left ventricular endocardial borders.
MATERIALS AND METHODS
Three healthy volunteers underwent MR imaging performed with a breath-hold segmented spoiled gradient-recalled-echo sequence with tissue tagging. Two saturation pulses (in the basal and apical regions) were used to generate black-blood images. Manual segmentation of endocardial contours on black-blood and white-blood images was performed independently by five observers.
RESULTS
Endocardial borders were better identified on black-blood images compared with white-blood images, especially in the early systolic phases. Interobserver variability in contour estimation was significantly higher for white-blood images (P < .001) and was twice that for corresponding black-blood images during early systole. Contour variability appeared to be affected mainly by tag-to-myocardium contrast (P = .009) and myocardium-to-chamber contrast (P = .05).
CONCLUSION
Blood presaturation of tagged MR images improves reliability of contour segmentation.
原理与目的
作者确定标记磁共振（MR）图像的血液预饱和是否会影响左心室心内膜边界的识别。
材料与方法
三名健康志愿者接受了使用屏气分段扰相梯度回波序列及组织标记进行的MR成像。使用两个饱和脉冲（在基底部和心尖部区域）生成黑血图像。由五名观察者独立对黑血和白血图像上的心内膜轮廓进行手动分割。
结果
与白血图像相比，黑血图像上的心内膜边界更易于识别，尤其是在收缩早期。白血图像轮廓估计的观察者间变异性显著更高（P <.001），并且在收缩早期是相应黑血图像的两倍。轮廓变异性似乎主要受标记与心肌对比度（P =.009）和心肌与腔室对比度（P =.05）的影响。
结论
标记MR图像的血液预饱和提高了轮廓分割的可靠性。
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