System performance of a hexagonal bar positron camera
The performance of the hexagonal bar positron camera has been evaluated for a variety of applications. This single-slice whole-body scanner has six continuous NaI(Tl) detectors, which remain stationary during data acquisition. Each detector has a spatial resolution of 6.0 mm at low data rates, although an improved resolution of 4.0 mm has been demonstrated with certain modifications. The measured resolution in the reconstructed image is 6.5 mm FWHM, which is independent of the distance from the center of the patient port. At a high countrate of 200 K singles, which is encountered with Rb-82 imaging, the image resolution is 7.5 mm. Before an image is reconstructed, the nonlinearities associated with continuous detectors are corrected. The data are rebinned into a sinogram and then normalized. The gaps between the detectors result in a 10% loss of data. Because of the missing data, a filtered backprojection with interpolation of the data across the gaps results in artifacts in images of extended objects. The authors therefore use a maximum likelihood iterative algorithm based on that of a previous study. Images of the Derenzo phantom and the Hoffman brain phantom do not have noticeable artifacts using this algorithm. In addition to the phantom studies, the authors have imaged human brains with F-18 deoxyglucose and dog hearts with generator produced Rb-82.
- Research Organization:
- Hospital of the Univ. of Pennsylvania, Philadelphia, PA
- OSTI ID:
- 6919534
- Report Number(s):
- CONF-850611-; TRN: 87-005546
- Journal Information:
- J. Nucl. Med.; (United States), Vol. 26:5; Conference: 32. annual meeting of the Society of Nuclear Medicine, Houston, TX, USA, 2 Jun 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
62 RADIOLOGY AND NUCLEAR MEDICINE
BIOMEDICAL RADIOGRAPHY
CAMERAS
X-RAY EQUIPMENT
BRAIN
PERFORMANCE
ALGORITHMS
CAT SCANNING
DATA ACQUISITION SYSTEMS
IMAGE PROCESSING
NAI DETECTORS
NONLINEAR PROBLEMS
RUBIDIUM 82
SCINTISCANNING
SPATIAL RESOLUTION
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BODY
CENTRAL NERVOUS SYSTEM
COMPUTERIZED TOMOGRAPHY
COUNTING TECHNIQUES
DIAGNOSTIC TECHNIQUES
ELECTRON CAPTURE RADIOISOTOPES
EQUIPMENT
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL LOGIC
MEASURING INSTRUMENTS
MEDICINE
MINUTES LIVING RADIOISOTOPES
NERVOUS SYSTEM
NUCLEAR MEDICINE
NUCLEI
ODD-ODD NUCLEI
ORGANS
PROCESSING
RADIATION DETECTORS
RADIOISOTOPE SCANNING
RADIOISOTOPES
RADIOLOGY
RESOLUTION
RUBIDIUM ISOTOPES
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
TOMOGRAPHY
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments
550600 - Medicine