Schultz E, Lackner K, Thurn P
Med Prog Technol. 1983;10(1):55-61.
The ECG-triggered CT-imaging-procedure (computed tomography system SOMATOM with ECG unit) provides the possibility of displaying the beating heart in each of its individual mobility phases. Thus the telediastolic and telesystolic volumes of the left ventricle can be determined approximately, and from this its ejection fraction. The present paper describes measurements on moving phantoms (acryl plate, fluid-filled balloon). They give an estimation of the accuracy with which cross-sectional areas can be determined by the above-mentioned CT-system as a function of the frequency of the movement and of the number of tube rotations per slice. Basing on those models and not paying regard to further sources of error as for example an irregular heartbeat, it is found that the ejection fraction can be determined with a relative error of +/- 11% . . . +/- 13% depending on the beat frequency.
心电图触发的CT成像程序（配备心电图单元的SOMATOM计算机断层扫描系统）能够在心脏跳动的各个不同运动阶段对其进行显示。由此可大致测定左心室的舒张末期容积和收缩末期容积，并据此得出其射血分数。本文描述了对移动模型（丙烯酸板、充液气球）的测量。这些测量给出了上述CT系统根据运动频率和每层管旋转次数确定横截面积的准确度估计。基于这些模型，且不考虑诸如心跳不规则等其他误差来源，发现射血分数可在±11%……±13%的相对误差范围内测定，具体取决于心跳频率。
