Boucher C A, Strauss H W, Okada R D, Kirshenbaum H D, Kushner F G, McKusick K A, Block P C, Leask J W, Pohost G M
J Nucl Med. 1980 Jan;21(1):71-6.
We have constructed a bifocal diverging collimator (BDC), capable of simultaneously recording two views of the heart 50 degrees apart on each half of a standard imaging field. In this study, simultaneous two-view blood-pool scans using the BDC were compared with the same two separate views obtained using an all-purpose parallel-hole collimator (PHC), assessing left-ventricular ejection fraction and regional wall motion in 20 patients undergoing contrast left ventriculography (CV). Ejection fraction by BDC correlated closely with PHC (r = 0.94) and with CV (r = 0.88). Regional wall motion was scored qualitatively on a five-point scale from 3 (normal) to--1 (dyskinesis) with an 88% agreement between BDC and PHC and PHC for segment scores. The percentages for agreement between BDC and CV, and between PHC and CV, were identical, 79%. A single blood-pool scan acquisition using a new BDC provides information about global and regional left-ventricular function in two planes, comparable with that of a PHC.
我们构建了一种双焦点发散准直器（BDC），它能够在标准成像视野的每一半上同时记录心脏相隔50度的两个视图。在本研究中，将使用BDC进行的同步双视图血池扫描与使用通用平行孔准直器（PHC）获得的相同两个单独视图进行了比较，评估了20例接受对比剂左心室造影（CV）患者的左心室射血分数和局部室壁运动。BDC测得的射血分数与PHC密切相关（r = 0.94），与CV也密切相关（r = 0.88）。局部室壁运动采用从3（正常）到-1（运动障碍）的五分制进行定性评分，BDC与PHC以及PHC与CV之间节段评分的一致性为88%。BDC与CV之间以及PHC与CV之间的一致性百分比相同，均为79%。使用新型BDC进行单次血池扫描采集可在两个平面上提供有关左心室整体和局部功能的信息，与PHC相当。
