Attenuation maps for SPECT determined using cone beam transmission computed tomography

Conference · Sun Apr 01 04:00:00 EDT 1990 · IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA)

OSTI ID:6609198

Manglos, S H; Bassano, D A; Duxbury, C E; Capone, R B ^[1]

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1. Dept. of Radiology, SUNY Health Science Center, Syracuse, NY (US)

This paper presents a new method for measuring non-uniform attenuation maps, using a cone beam geometry CT scan acquired on a standard rotating gamma camera normally used for SPECT imaging. The resulting map is intended for use in non-uniform attenuation compensation of SPECT images. The method was implemented using a light-weight point source holder attached to the camera. A cone beam collimator may be used on the gamma camera, but the cone beam CT scans may also be acquired without collimator. In either implementation, the advantages include very high efficiency and resolution limited not by the collimator but by the intrinsic camera resolution (about 4 mm). Several phantoms tested the spatial uniformity, noise, linearity as a function of attenuation coefficient, and spatial resolution. Good quality attenuation maps were obtained, at least for the central slices where no truncation was present.

• OSTI ID: 6609198
• Report Number(s): CONF-900143--
• Conference Information: Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA) Journal Volume: 37:2
• Country of Publication: United States
• Language: English

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655003 -- Medical Physics-- Dosimetry
BEAM OPTICS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAMERAS
COLLIMATORS
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
DOSES
DOSIMETRY
EMISSION COMPUTED TOMOGRAPHY
GAMMA CAMERAS
HOURS LIVING RADIOISOTOPES
IMAGE PROCESSING
IMAGE SCANNERS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MOCKUP
NUCLEI
ODD-EVEN NUCLEI
PHANTOMS
PROCESSING
RADIATION DOSES
RADIOISOTOPES
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
STRUCTURAL MODELS
TECHNETIUM 99
TECHNETIUM ISOTOPES
TECHNOLOGY ASSESSMENT
TOMOGRAPHY
YEARS LIVING RADIOISOTOPES