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The Hybrid Radioisotope Scanner¹

Rochester, New York

ABSTRACT

A radioisotope mapping system intermediate in speed and complexity between a standard mechanical rectilinear scanner and a stationery camera-type device was developed in this laboratory. In this instrument, a scintillation position sensing system is used for the determination of activity distribution in one direction, while the complete area map is produced by a mechanical motion at right angles to this direction. Because of the combination of an electronically sensed transverse scan with a mechanical longitudinal scan, the instrument has been termed the hybrid scanner.

In this communication, the operating principle and design of the hybrid scanner are described, and performance characteristics of the instrument are discussed. Several clinical scans are presented, including a brain scan made in 90 seconds under unusually favorable conditions of high activity and high target-to-non-target specific activity ratio. The advantages and disadvantages of the present version of this instrument are discussed, and areas of potential improvement noted.

The hybrid scanner has proved to be extraordinarily simple to align and operate, and has produced radioisotope maps of satisfactory quality in about one-half to one-fifth of the time required for a conventional rectilinear scan. Experience gained with this instrument during development leads to considerable optimism that it will prove to be a useful addition to the array of radioisotope mapping instruments now available.

FOOTNOTES

¹ This paper is based on work performed under contract with the United States Atomic Energy Commission at the University of Rochester Atomic Energy Project, Rochester, New York.

² From the Department of Radiation Biology and Biophysics, The University of Rochester School of Medicine and Dentistry, Rochester, New York.