The authors have constructed a bifocal diverging collimator (BDC), capable of simultaneously recording 2 views of the heart 50° apart on each half of a standard imaging field. In this study, simultaneous 2-view blood-pool scans using the BDC were compared with the same 2 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 5-point scale from 3 (normal) to -1 (dyskinesis) with an 88% agreement between BDC 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 2 planes, comparable with that of a PHC.
|Number of pages||6|
|Journal||Journal of Nuclear Medicine|
|State||Published - 1980|