Recent progress on single photon and positron emission tomography - From detectors to algorithms
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-; TRN: 87-015164
- Journal Information:
- IEEE Trans. Nucl. Sci.; (United States), Vol. NS-34:1; Conference: Nuclear science and nuclear power systems symposium, Washington, DC, USA, 29 Oct 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BRAIN
POSITRON COMPUTED TOMOGRAPHY
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
ALGORITHMS
ATTENUATION
CESIUM BROMIDES
CESIUM IODIDES
COLLIMATORS
CORRECTIONS
IMAGE PROCESSING
IMAGE SCANNERS
INCIDENCE ANGLE
ITERATIVE METHODS
NOISE
RADIOSENSITIVITY
SCINTILLATION COUNTERS
SPATIAL RESOLUTION
TIME-OF-FLIGHT METHOD
ALKALI METAL COMPOUNDS
BODY
BROMIDES
BROMINE COMPOUNDS
CENTRAL NERVOUS SYSTEM
CESIUM COMPOUNDS
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
HALIDES
HALOGEN COMPOUNDS
INORGANIC PHOSPHORS
IODIDES
IODINE COMPOUNDS
MATHEMATICAL LOGIC
MEASURING INSTRUMENTS
NERVOUS SYSTEM
ORGANS
PHOSPHORS
PROCESSING
RADIATION DETECTORS
RESOLUTION
TOMOGRAPHY
550602* - Medicine- External Radiation in Diagnostics- (1980-)
440101 - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments