The bifocal diverging collimator: A means of simultaneous biplane imaging of the heart during equilibrium radionuclide ventriculography

C. A. Boucher, H. W. Strauss, R. D. Okada, H. D. Kirshenbaum, F. G. Kushner, K. A. McKusick, P. C. Block, J. W. Leask, G. M. Pohost

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4 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)71-76
Number of pages6
JournalJournal of Nuclear Medicine
Volume21
Issue number1
StatePublished - 1980
Externally publishedYes

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