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Division of Nuclear Medicine, Department of Radiology, St. Luke's-Roosevelt Hospital, and Columbia University College of Physicians and Surgeons, New York, New York
Correspondence: For correspondence or reprints contact: E. Gordon DePuey, MD, Division of Nuclear Medicine, St. Luke's-Roosevelt Hospital, Amsterdam Ave. at 114th St. New York, NY 10025.
ABSTRACT
Although myocardial perfusion imaging with SPECT is an accurate and reliable diagnostic study, artifacts must be avoided, or detected and corrected, to minimize the rate of false-positive results. Common sources of artifacts are nonuniformity in gamma camera detectors, center of rotation errors, misaligned cameras on multidetector scanner systems, errors in image reconstruction, patient motion, radiotracer uptake in nontarget organs and attenuation. Some of these artifacts can be avoided by quality control of instrumentation and by imaging the patient in a prone rather than supine position to separate radiotracer activity from the target and nontarget organs and to reduce the effect of inferior wall attenuation. Other artifacts can be detected by careful image inspection and corrected by reprocessing. The best way to avoid artifacts is to pay very close attention to the technical factors of image acquisition and processing, and to be aware of attenuation factors.
Key Words: myocardial perfusion imaging • SPECT artifacts
FOOTNOTES
This paper was presented in part at the Annual Meeting of the Society of Nuclear Medicine on June 11, 1993, as part of a Continuing Medical Education Seminar organized by the Cardiovascular Council.
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