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Characteristics of a Scanning, Multidetector, Single-Photon ECT Body Imager

Harvard Medical School and Brigham and Women's Hospital, Boston, Massachusetts

Correspondence: For reprints contact: B. Leonard Holman, MD, Dept. of Radiology, Harvard Medical School, 25 Shattuck St., Boston, MA 02115.

ABSTRACT

We evaluated a single-photon emission computed tomographic system using ten scanning detectors in a circular array. The system uses focusing collimators that scan radially as well as tangentially.

The spatial resolution in the tomographic plane is 2.6 cm FWHM and the axial resolution is 3.3 cm FWHM. The resolution is independent of position within the field of view, and nearly independent of energy through 511 keV. Sensitivity was found to be 4600 cps/µCi-ml for an extended phantom, 20-cm in diameter, filled with Tc-99m; 7200 cps/µCi-ml with TI-201; and 8000 cps/µCi-ml with Ga-67. Investigations of positional uniformity indicated some quantitative distortion of data due to inadequate attenuation correction. Improvement in the attenuation correction is necessary before truly quantitative tracer distribution studies are undertaken.