A solid-state intraoperative beta probe system

Successful beta-sensitive intraoperative probes must be capable of detecting relatively small amounts of beta-emitting radionuclides in an environment where a significant photon background exists. The probe system described in this investigation utilized a new photon correction scheme consisting of...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2000-08, Vol.47 (4), p.1696-1703
Main Author: Raylmann, R.R.
Format: Article
Language:English
Subjects:
Beta
Computational modeling
Computer simulation
Computerized monitoring
Contamination
Data acquisition
Detectors
Disks
Ion implantation
Monitors
Neoplasms
Oncology
Photons
Pollution measurement
Positrons
Probes
Radioisotopes
Radiotherapy
Semiconducting silicon
Solid state circuits
Tumors
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Summary:Successful beta-sensitive intraoperative probes must be capable of detecting relatively small amounts of beta-emitting radionuclides in an environment where a significant photon background exists. The probe system described in this investigation utilized a new photon correction scheme consisting of a stark of two ion-implanted-silicon detectors (IISDs) mounted in a compact unit. The rear detector operated as a photon monitor, whose data was used to correct for photon contamination present in the front detector's readings. The completely battery-powered system incorporated a computer-controlled data acquisition and processing system. Positron and photon detection sensitivities were measured using fluorine-18. The probe was found to have a positron detection sensitivity of 7.21/spl plusmn/0.11 cps/nCi and a 0.0001/spl plusmn/0.0389 cps/nCi photon detection sensitivity. In a simulated search for tumor remnants following a tumor resection using a phantom presenting a realistic annihilation photon background, the intraoperative probe was capable of definitively identifying 12-mm- and 6-mm-diameter, 1-mm-thick disks of simulated tumor.
ISSN:0018-9499
1558-1578
DOI:10.1109/23.870863