High-temporal-resolution CdTe nuclear stethoscope for cardiac g-ventriculography: preclinical evaluation

摘要

Abstract: A hand-size probe including 64 elementary 5 $MUL 5 $MUL 2 mm CdTe detectors has been optimized to detect the $gamma tracer $+99$/Tc in the heart left ventricle. The system, has been developed, not for imaging, allowing acquisitions at 33 Hz to describe the labeled blood volume variations. The $gamma@-counts variations were found accurately proportional to the known volume variations of an artificial ventricle paced at variable rate and systolic volume. Softwares for on line data monitoring and for post-processing have been developed for beat to beat assessment of cardiac performance at rest and during physical exercise. The evaluation of this probe has been performed on 5 subjects in the Nucl Dep of Balatonfured Cardiology Hospital. It appears that the probe needs to be better shielded to work properly in the hot environment of the ventricle, but can provide reliable ventriculography, even under heavy exercise load, although the ventricle volume itself is unknown.!1