title: Characterization of MOSFET detectors for in vivo dosimetry in interventional radiology and for dose reconstruction in case of overexposure.
abstract: As MOSFET (Metal Oxide Semiconductor Field Effect Transistor) detectors allow dose measurements in real time, the interest in these dosimeters is growing. The aim of this study was to investigate the dosimetric properties of commercially available TN-502RD-H MOSFET silicon detectors (Best Medical Canada, Ottawa, Canada) in order to use them for in vivo dosimetry in interventional radiology and for dose reconstruction in case of overexposure. Reproducibility of the measurements, dose rate dependence, and dose response of the MOSFET detectors have been studied with a Co source. Influence of the dose rate, frequency, and pulse duration on MOSFET responses has also been studied in pulsed x-ray fields. Finally, in order to validate the integrated dose given by MOSFET detectors, MOSFETs and TLDs (LiF:Mg,Cu,P) were fixed on an Alderson-Rando phantom in the conditions of an interventional neuroradiology procedure, and their responses have been compared. The results of this study show the suitability of MOSFET detectors for in vivo dosimetry in interventional radiology and for dose reconstruction in case of accident, provided a well-corrected energy dependence, a pulse duration equal to or higher than 10 ms, and an optimized contact between the detector and the skin of the patient are achieved.
authors: Institut de Radioprotection et de Sûreté Nucléaire (IRSN), BP17, 92262 Fontenay-aux-Roses cedex, France. celine.bassinet@irsn.fr
authors: Céline
authors: C
authors: Bassinet
authors: Christelle
authors: C
authors: Huet
authors: Marion
authors: M
authors: Baumann
authors: Cécile
authors: C
authors: Etard
authors: Jean-Luc
authors: JL
authors: Réhel
authors: Gilbert
authors: G
authors: Boisserie
authors: Jacques
authors: J
authors: Debroas
authors: Bernard
authors: B
authors: Aubert
authors: Isabelle
authors: I
authors: Clairand
mesh_terms: D019583:Dose Fractionation, Radiation; D006801:Humans; D009485:Neuroradiography; D019047:Phantoms, Imaging; D015642:Radiology, Interventional / Q000295:instrumentation* / Q000379:methods; D011874:Radiometry / Q000295:instrumentation*; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000295:instrumentation* / Q000379:methods