A GAMMA camera-fanbeam collimator system for total body longitudinal tomography

Conference · Wed May 01 04:00:00 EDT 1985 · J. Nucl. Med.; (United States)

OSTI ID:5958701

Halama, J R; Henkin, R E

The Anger tomographic scanner (ATS) has proven to be a useful total body imaging device. ATS tomogram are longitudinal rather than transaxial, formed by focusing of activity at depth. The authors propose a new system that is based on whole body imaging gamma camera, a computer interface, and fanbeam collimator (FBC). FBC holes converge along one axis, but remain parallel along the perpendicular axis. Tomograms are achieved by moving the detector under computer control longitudinally over the patient with the FBC converging axis aligned perpendicular to the direction of motion. No latitudinal detector motion is required. A prototype was tested with a FBC designed for SPECT with a focal axis at 60 cm depth. Images were acquired in a step-and-shoot mode. A computer program was developed to reconstruct tomograms at desired depths. Tomograms of a clock phantom with 6 cm slice thicknesses were achieved with an interslice resolution of 1 cm at 8 cm depth. The authors believe a need still exists for longitudinal total body emission tomography. This system is potentially inexpensive using much of the available laboratory equipment, and is mechanically simple to implement. Shortening the FBC focal axis depth to 30 cm would greatly improve tomographic definition. Development of deconvolution algorithms would be needed to further improve tomographic definition.

• Research Organization: Loyola Univ. Medical Center, Maywood, IL
• OSTI ID: 5958701
• Report Number(s): CONF-850611-
• Conference Information: Journal Name: J. Nucl. Med.; (United States) Journal Volume: 26:5
• Country of Publication: United States
• Language: English

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ALGORITHMS
CAMERAS
CAT SCANNING
COLLIMATORS
COMPUTERIZED TOMOGRAPHY
DESIGN
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
GAMMA CAMERAS
IMAGE PROCESSING
IMAGE SCANNERS
MATHEMATICAL LOGIC
PROCESSING
RESOLUTION
SENSITIVITY
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
TOMOGRAPHY