Measurement of Compton scattering in phantoms by germanium detectors

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

OSTI ID:6587518

Zasadny, K R; Koral, K F ^[1]; Floyd, Jr, C E; Jaszczak, R J ^[2]

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1. Michigan Univ., Ann Arbor, MI (USA). Medical Center
2. Duke Univ., Durham, NC (USA). Dept. of Radiology

Quantitative Anger-camera tomography requires correction for Compton scattering. The Anger camera spectral-fitting technique can measure scatter fractions at designated positions in an image allowing for correction. To permit verification of those measurements for {sup 131}I, the authors have determined scatter fractions with a high-purity germanium (HPGe) detector and various phantom configurations. The scatter fraction values for {sup 99m}Tc were also measured and are compared to results from Monte Carlo simulation. The phantom consisted of a 22.2 cm diameter {times} 18.6 cm high cylinder filled with water and a 6 cm diameter water-filled sphere placed at various locations inside the cylinder. Radioisotope is added to either the sphere or the cylinder. The source is collimated by an Anger camera collimator and the active area of the HPGe detector is defined by a 0.6 cm diameter hole in a lead shielding mask. Corrections include accounting for the HPGe detector efficiency as a function of gamma-ray energy, the finite energy resolution of detector and the HPGe detector energy resolution compared to that for a NaI(Tl) Anger camera.

• OSTI ID: 6587518
• 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

Related Subjects

440103* -- Radiation Instrumentation-- Nuclear Spectroscopic Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
61 RADIATION PROTECTION AND DOSIMETRY
654001 -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
655003 -- Medical Physics-- Dosimetry
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BASIC INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAMERAS
COLLIMATORS
COMPTON EFFECT
DAYS LIVING RADIOISOTOPES
DETECTION
EFFICIENCY
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
GAMMA CAMERAS
GAMMA DETECTION
GE SEMICONDUCTOR DETECTORS
HOURS LIVING RADIOISOTOPES
IMAGE PROCESSING
INTERACTIONS
INTERMEDIATE MASS NUCLEI
IODINE 131
IODINE ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MEASURING INSTRUMENTS
MOCKUP
MONTE CARLO METHOD
NAI DETECTORS
NUCLEI
ODD-EVEN NUCLEI
PHANTOMS
PROCESSING
RADIATION DETECTION
RADIATION DETECTORS
RADIOISOTOPES
SCATTERING
SCINTILLATION COUNTERS
SEMICONDUCTOR DETECTORS
SOLID SCINTILLATION DETECTORS
STRUCTURAL MODELS
TECHNETIUM 99
TECHNETIUM ISOTOPES
YEARS LIVING RADIOISOTOPES