AN EVALUATION OF THE BASIC CHARACTERISTICS OF A PLASTIC SCINTILLATING FIBRE DETECTOR IN CT RADIATION FIELDS

The ionisation chamber for computed tomography (CT) is an instrument that is most commonly used to measure the computed tomography dose index. However, it has been reported that the 10 cm effective detection length of the ionisation chamber is insufficient due to the extent of the dose distribution...

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Bibliographic Details
Published in:Radiation protection dosimetry 2016-12, Vol.171 (4), p.527-533
Main Authors: Terasaki, Kento, Fujibuchi, Toshioh, Toyoda, Takatoshi, Yoshida, Yutaka, Akasaka, Tsutomu, Nohtomi, Akihiro, Morishita, Junji
Format: Article
Language:English
Subjects:
Calibration
Humans
Monte Carlo Method
Phantoms, Imaging
Plastics
Radiation Dosage
Radiometry - methods
Reproducibility of Results
Scintillation Counting - instrumentation
Scintillation Counting - methods
Tomography, X-Ray Computed - methods
X-Rays
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Summary:The ionisation chamber for computed tomography (CT) is an instrument that is most commonly used to measure the computed tomography dose index. However, it has been reported that the 10 cm effective detection length of the ionisation chamber is insufficient due to the extent of the dose distribution outside the chamber. The purpose of this study was to estimate the basic characteristics of a plastic scintillating fibre (PSF) detector with a long detection length of 50 cm in CT radiation fields. The authors investigated position dependence using diagnostic X-ray equipment and dependencies for energy, dose rate and slice thickness using an X-ray CT system. The PSF detector outputs piled up at a count rate of 10 000 counts ms in dose rate dependence study. With calibration, this detector may be useful as a CT dosemeter with a long detection length except for the measurement at high dose rate.
ISSN:0144-8420
1742-3406
DOI:10.1093/rpd/ncv473