Therapy imaging: a signal-to-noise analysis of metal plate/film detectors
Journal Article
·
· Med. Phys.; (United States)
We have measured the modulation transfer functions (MTF (f)'s) and the noise power spectra (NPS (f)) of therapy x-ray detectors irradiated by /sup 60/Co, 6- and 18-MV radiotherapy beams. Using these quantities, we have calculated the noise-equivalent quanta (NEQ (f)) and the detective quantum efficiency (DQE (f)) to quantitate the limitations of therapy detectors. The detectors consisted of film or fluorescent screen-film combinations in contact with copper, lead, or tungsten metal plates. The resolution of the detectors was found to be comparable to fluorescent screen-film combinations used in diagnostic radiology, however, the signal-to-noise ratio (SNR (f)) of the detectors was limited due to film granularity. We conclude that improved images can be obtained by using alternative detector systems which have less noise or film granularity.
- Research Organization:
- Univ. of Toronto, Ontario
- OSTI ID:
- 5414727
- Journal Information:
- Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 14:6; ISSN MPHYA
- Country of Publication:
- United States
- Language:
- English
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440102* -- Radiation Instrumentation-- Radiation Dosemeters
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COBALT 60
COBALT ISOTOPES
IMAGE PROCESSING
IMAGES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
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MINUTES LIVING RADIOISOTOPES
NUCLEAR MEDICINE
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RADIATION DETECTORS
RADIOISOTOPES
RADIOLOGY
RADIOTHERAPY
SIGNAL-TO-NOISE RATIO
THERAPY
YEARS LIVING RADIOISOTOPES
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COBALT 60
COBALT ISOTOPES
IMAGE PROCESSING
IMAGES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MEASURING INSTRUMENTS
MEDICINE
MINUTES LIVING RADIOISOTOPES
NUCLEAR MEDICINE
NUCLEI
ODD-ODD NUCLEI
PROCESSING
RADIATION DETECTORS
RADIOISOTOPES
RADIOLOGY
RADIOTHERAPY
SIGNAL-TO-NOISE RATIO
THERAPY
YEARS LIVING RADIOISOTOPES