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Comparison 180° and 360° Data Collection in Thallium-201 Imaging Using Single-Photon Emission Computerized Tomography (SPECT): Concise Communication

Duke University Medical Center, Durham, North Carolina

Correspondence: For reprints contact: R. Edward Coleman, MD, Box 3949, Dept. of Radiology, Duke University Medical Center, Durham, NC 27710.

ABSTRACT

Thallium-201 imaging SPECT is being done with 180° (RAO to LPO) data collection in some centers with single-gamma camera systems. Using our SPECT system with two gamma cameras, we have compared the effects of 180° data collection without attenuation correction against 360° collection with attenuation correction, using phantoms and patients. With a heart phantom in a chest phantom, TI-201 activities simulating "normal myocardium," "ischemia," "infarction," and "background" were placed in object contrast ratios (with respect to background) of 5.0, 2.0, and –1.0, respectively. The 180° data gave image contrast ratios of 1.6, 0.2, and –0.8, and the 360° data gave ratios of 1.5, 0.8, and –0.3, respectively. Uniform activity throughout the heart gave similar image contrast with both data-collection methods, but there was more variability with the 180° collection than with 360° collection. Since attenuation correction is available with the 360° collection, the effects of attenuation are seen only on the 180° collection images. In eight patients the image contrasts from the 180° and 360° collections are similar. For our two-camera SPECT system, the 360° collection permits attenuation correction, has less variability in counting statistics, and gives contrast ratios like those of 180° collection.

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