Recent progress on single photon and positron emission tomography - From detectors to algorithms

Conference · Sun Feb 01 04:00:00 EST 1987 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:6700172

Tanaka, E

In the last few years, great efforts have been made to achieve higher sensitivity, higher spatial resolution, better image quality and quantification. In the SPECT, collimators and scanning methods have been improved. 180/sup 0/ sagittal scan is proposed for brain imaging. Practical correction methods for uniform attenuation are compared from a view point of noise propagation. In the PET system, current status of TOF-PET, high resolution PET are reviewed. CsI(Br) scintillator is a candidate of a new PET detector. For stationary PET using discrete detectors, an iterative method is preferable for the image reconstruction, because it does not need to satisfy the conventional sampling requirement for projections. Recent ECT technology tends to be sophisticated both in data acquisition and processing. It needs more powerful and versatile algorithms. Iterative reconstruction methods should be reconsidered as a tool of routine use. The EM algorithm is attractive, but it seems to need a trick to accelerate the convergence. A fast maximum likelihood algorithm is proposed, which can provide satisfactory images by a few iterations.

• Research Organization: Div. of Physics, National Institute of Radiological Sciences, 9-1, Anagawa-4-chome, Chiba-shi 260
• OSTI ID: 6700172
• Report Number(s): CONF-861007-
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: NS-34:1
• Country of Publication: United States
• Language: English

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62 RADIOLOGY AND NUCLEAR MEDICINE
ALGORITHMS
ALKALI METAL COMPOUNDS
ATTENUATION
BODY
BRAIN
BROMIDES
BROMINE COMPOUNDS
CENTRAL NERVOUS SYSTEM
CESIUM BROMIDES
CESIUM COMPOUNDS
CESIUM IODIDES
COLLIMATORS
COMPUTERIZED TOMOGRAPHY
CORRECTIONS
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
HALIDES
HALOGEN COMPOUNDS
IMAGE PROCESSING
IMAGE SCANNERS
INCIDENCE ANGLE
INORGANIC PHOSPHORS
IODIDES
IODINE COMPOUNDS
ITERATIVE METHODS
MATHEMATICAL LOGIC
MEASURING INSTRUMENTS
NERVOUS SYSTEM
NOISE
ORGANS
PHOSPHORS
POSITRON COMPUTED TOMOGRAPHY
PROCESSING
RADIATION DETECTORS
RADIOSENSITIVITY
RESOLUTION
SCINTILLATION COUNTERS
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
SPATIAL RESOLUTION
TIME-OF-FLIGHT METHOD
TOMOGRAPHY