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Dual-Channel Facilitation of the ^99mTc Radiocardiogram

Veterans Administration Hospital, Hines, Illinois

Correspondence: For reprints contact: Ervin Kaplan, Nuclear Medicine Service, V.A. Hospital, Hines, Ill. 60141.

ABSTRACT

A refinement of the radionuclide-angiocardiogram is described using a low deadtime scintillation camera and hardwire data storage, processing, and display system for the purpose of anatomic definition of the passage of a radioactive bolus through the cardiopulmonary circulation by dual-channel, dual-color, subtraction methodology. The summation of the bolus pathway is displayed as a static frame of reference for the sequential kinetic image. The technique is noninvasive and employs 15 mCi of ^99mTc pertechnetate. This procedure may be employed as the conventional bolus study for determining the cardiac kinetics ordinarily obtained by the method. The opportunity of viewing the bolus position in relation to its entire pathway significantly facilitates defining the multiple areas of interest the observer may wish to study.