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A technical analysis of an intraoperative radiation detection probe
Author(s) -
Wilson Latresia A.,
Kuhn Joseph A.,
Corbisiero Raffael M.,
Smith Merle,
Beatty J. David,
Williams Lawrence E.,
Rusnak Miro,
Kondo Russell L.,
Demidecki Andre J.
Publication year - 1992
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596754
Subject(s) - medical physics , medical imaging , dosimetry , medicine , nuclear medicine , radiology
A technical evaluation was made of a commercial intraoperative radiation probe. This device utilizes a CsI(Tl) scintillation detector and light pipe arrangement to count gamma radiation in vivo . After determining the optimal window and threshold setting, additional evaluations included linearity, distance response function, detector dead time, counter reproducibility, detector sensitivity, angular resolution, and energy resolution. Detector dead time (21.2 μs) was found to be characteristic of a nonparalysable system. Activity response for each radionuclide was linear ( R =0.99) both with and without collimation. Energy resolution, 25% at 210 keV, was not sufficient to separate the two photons (172 and 247 keV) emitted by 111 In. Detector sensitivity was 1136 and 626 counts per s per microcurie of 111 In and 99m Tc, respectively. The mean effective distance from the face of the uncollimated probe to the crystal was determined to be 2.03 cm in air.