Digitized Longitudinal Tomography System

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Abstract
The concepts of using the fluoroscopic image for producing tomograms and digitized representations of these images is based on the concepts of the single scan radiographic system and the use of a video disk first introduced by Baker and Miller.1 These authors showed that by blanking the video camera during the x-ray exposure and then introducing a delay period before allowing the electron beam to sweep the camera tube target a considerable increase in signal-to-noise ratio could be achieved. Building on this concept Lasser, et a1,2 achieved true fluoroscopic longitudinal tomography. This was done by placing a negative voltage on the camera target during the long period (l, 2 sec) required for the x-ray tube-image receptor motion to be completed. Excellent tomographic images having slice thicknesses of less than 2 mm were produced at exposure levels of 25-60 mR. Images were recorded for several motion patterns found on standard clinical tomographic equipment. These were; linear, circular, and hypocycloidal.

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