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Departments of Nuclear Medicine and Cardiology, Cleveland Clinic Foundation, Cleveland, Ohio
Correspondence: For reprints contact: Raymundo T. Go, MD, Department of Nuclear Medicine, Gb3, Cleveland Clinic Foundation, 9500 Euclid Ave., Cleveland, OH 44195-5074.
ABSTRACT
The purpose of the present study is to prospectively compare myocardial perfusion imaging with rubidium-82 (82Rb) by positron emission tomography (PET) with thallium-201 (201Tl) imaging by single-photon emission tomography (SPECT) by recording both studies with a single dipyridamole handgrip stress, and reading both sets of images with the same display technique. In a series of 202 patients with previous coronary arteriography, the sensitivity, specificity, and accuracy of 82Rb PET were 93%, 78%, and 90% and for 201Tl SPECT 76%, 80%, and 77%, respectively. When 70 patients with previous therapeutic interventions were excluded, the remaining 132 patients showed a sensitivity, specificity, and accuracy of 95%, 82% and 92% for 82Rb PET and 79%, 76%, and 78% for 201Tl SPECT. The improved contrast resolution of PET resulted in markedly superior images and a more confident identification of defects.
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