Marcus J T, Götte M J, DeWaal L K, Stam M R, Van der Geest R J, Heethaar R M, Van Rossum A C
Department of Medical Physics and Informatics, University Hospital, Vrije Universiteit, Amsterdam, The Netherlands.
J Cardiovasc Magn Reson. 1999;1(1):1-6. doi: 10.3109/10976649909080828.
In the evaluation of the left ventricular (LV) function using magnetic resonance imaging (MRI), a stack of parallel short-axis (SA) cine images is acquired that covers the whole LV. The aim of this study is to quantify the contribution to the LV volume parameters, provided by the most basal image plane that shows the LV wall only in end diastole (ED) but not in end systole (ES). In 57 healthy volunteers (31 men, mean body surface area 1.87 m2), a complete set of parallel SA images was acquired (10-mm slice distance) by breathhold segmented k-space cine MRI (7 ky lines per beat). The LV end-diastolic volume (EDV), stroke volume (SV), ejection fraction (EF), and cardiac output (CO) were determined by slice summation. Calculations were performed both with and without inclusion of the most basal slice. With inclusion of the most basal slice, all parameters were significantly (p < 0.001) larger compared with the values obtained by excluding this slice. EDV was 134 +/- 29 ml versus 113 +/- 26 ml; SV was 93 +/- 18 ml versus 72 +/- 16 ml; EF was 70 +/- 4% versus 64 +/- 4%; and CO was 5.3 +/- 1.4 l/min versus 4.1 +/- 1.1 l/min. The inclusion of the most basal slice leads to significantly larger values of LV volume parameters. Thus, this most basal SA image slice should be included in calculating the EDV. Whether or not this basal SA slice also contributes to the ES volume should be decided by using anatomical criteria on the ES image. The projection line onto the ES image of a long-axis view provides an additional criterion.
在使用磁共振成像（MRI）评估左心室（LV）功能时，会采集一系列平行的短轴（SA）电影图像，这些图像覆盖整个左心室。本研究的目的是量化最基底图像平面（该平面仅在舒张末期（ED）显示左心室壁，而在收缩末期（ES）不显示）对左心室容积参数的贡献。在57名健康志愿者（31名男性，平均体表面积1.87平方米）中，通过屏气分段k空间电影MRI（每搏7条ky线）采集了完整的平行SA图像集（层厚10毫米）。通过逐层求和确定左心室舒张末期容积（EDV）、每搏输出量（SV）、射血分数（EF）和心输出量（CO）。分别计算了包含和不包含最基底层面时的各项参数。包含最基底层面时，所有参数与排除该层面时获得的值相比均显著更大（p < 0.001）。EDV为134±29毫升，而排除该层面时为113±26毫升；SV为93±18毫升，而排除该层面时为72±16毫升；EF为70±4%，而排除该层面时为64±4%；CO为5.3±1.4升/分钟，而排除该层面时为4.1±1.1升/分钟。包含最基底层面会导致左心室容积参数值显著增大。因此，在计算EDV时应包含这个最基底的SA图像层面。是否将这个基底SA层面也纳入ES容积的计算，应根据ES图像上的解剖学标准来决定。长轴视图在ES图像上的投影线提供了一个额外的标准。
