Collimator performance evaluation by Monte-Carlo techniques

Conference · Wed May 01 04:00:00 EDT 1985 · J. Nucl. Med.; (United States)

OSTI ID:6793784

Milanesi, L; Bettinardi, V; Bellotti, E; Gilardi, M C; Todd-Pokropek, A; Fazio, F

A computer program using Monte-Carlo techniques has been developed to simulate gamma camera collimator performance. Input data include hole length, septum thickness, hole size and shape, collimator material, source characteristics, source to collimator distance and medium, radiation energy, total events number. Agreement between Monte-Carlo simulations and experimental measurements was found for commercial hexagonal parallel hole collimators in terms of septal penetration, transfer function and sensitivity. The method was then used to rationalize collimator design for tomographic brain studies. A radius of ration of 15 cm was assumed. By keeping constant resolution at 15 cm (FWHM = 1.3.cm), SPECT response to a point source was obtained in scattering medium for three theoretical collimators. Sensitivity was maximized in the first collimator, uniformity of resolution response in the third, while the second represented a trade-off between the two. The high sensitivity design may be superior in the hot spot and/or low activity situation, while for distributed sources of high activity an uniform resolution response should be preferred. The method can be used to personalize collimator design to different clinical needs in SPECT.

• Research Organization: Istituto San Raffaele
• OSTI ID: 6793784
• Report Number(s): CONF-850611-
• Conference Information: Journal Name: J. Nucl. Med.; (United States) Journal Volume: 26:5
• Country of Publication: United States
• Language: English

Related Subjects

440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
550601* -- Medicine-- Unsealed Radionuclides in Diagnostics
62 RADIOLOGY AND NUCLEAR MEDICINE
CAMERAS
COLLIMATORS
COMPUTERIZED SIMULATION
COMPUTERIZED TOMOGRAPHY
DESIGN
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
EVALUATION
GAMMA CAMERAS
IMAGE PROCESSING
MONTE CARLO METHOD
PERFORMANCE
PERFORMANCE TESTING
PROCESSING
RESOLUTION
SIMULATION
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
TESTING
TOMOGRAPHY