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The Journal of Nuclear Medicine Vol. 33 No. 10 1881-1887
© 1992 by Society of Nuclear Medicine
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Description of a Prototype Emission Transmission Computed Tomography Imaging System

Thomas F. Lang, Bruce H. Hasegawa, Soo Chin Liew*, J. Keenan Brown, Stephen C. Blankespoor, Susan M. Reilly, Eric L. Gingold and Christopher E. Cann

Department of Radiology and Bioengineering Graduate Group, University of California, San Francisco, California

Correspondence: For reprints contact: Thomas F. Lang, PhD, UCSF Physics Research Lab, 389 Oyster Point Blvd., South San Francisco, CA. 94080.

ABSTRACT

We have developed a prototype imaging system that can perform simultaneous x-ray transmission CT and SPECT phantom studies. This system employs a 23-element high purity-germanium detector array. The detector array is coupled to a collimator with septa angled toward the focal spot of an x-ray tube. During image acquisition, the x-ray fan beam and the detector array move synchronously along an arc pivoted at the x-ray source. Multiple projections are obtained by rotating the object, which is mounted at the center of rotation of the system. The detector array and electronics can count up to 106 cps/element with sufficient energy resolution to discriminate between x-rays at 100–120 kVp and gamma rays from 99mTc. We have used this device to acquire x-ray CT and SPECT images of a three-dimensional Hoffman brain phantom. The emission and transmission images may be superimposed in order to localize the emission image on the transmission map.

FOOTNOTES

* Current address: Department of Physics, National University of Singapore.




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Copyright © 1992 by the Society of Nuclear Medicine.