Journal article
Characterization of a water-equivalent fiber-optic coupled dosimeter for use in diagnostic radiology
Medical physics (Lancaster), Vol.36(5), pp.1711-1716
05/2009
DOI: 10.1118/1.3116362
PMID: 19544788
Abstract
This work reports on the characterization of a new fiber-optic coupled (FOC) dosimeter for use in the diagnostic radiology energy range. The FOC dosimeter was constructed by coupling a small cylindrical plastic scintillator,
500
μ
m
in diameter and 2 mm in length, to a 2 m long optical fiber, which acts as a light guide to transmit scintillation photons from the sensitive element to a photomultiplier tube (PMT). A serial port interface on the PMT permits real-time monitoring of light output from the dosimeter via a custom computer program. The FOC dosimeter offered excellent sensitivity and reproducibility, allowing doses as low as 0.16 mGy to be measured with a coefficient of variation of only 3.64%. Dose linearity was also excellent with a correlation coefficient of 1.000 over exposures ranging from 0.16 to 57.29 mGy. The FOC dosimeter exhibited little angular dependence from axial irradiation, varying by less than 5% over an entire revolution. A positive energy dependence was observed and measurements performed within a scatter medium yielded a 10% variation in sensitivity as beam quality changed due to hardening and scatter across a 16 cm depth range. The current dosimetry system features an array of five PMTs to allow multiple FOC dosimeters to be monitored simultaneously. Overall, the system allows for rapid and accurate dose measurements relevant to a range of diagnostic imaging applications.
Details
- Title: Subtitle
- Characterization of a water-equivalent fiber-optic coupled dosimeter for use in diagnostic radiology
- Creators
- Daniel E Hyer - University of Florida, 202 Nuclear Sciences Center, P.O. Box 118300, Gainesville, Florida 32611Ryan F Fisher - University of Florida, 202 Nuclear Sciences Center, P.O. Box 118300, Gainesville, Florida 32611David E Hintenlang - University of Florida, 202 Nuclear Sciences Center, P.O. Box 118300, Gainesville, Florida 32611
- Resource Type
- Journal article
- Publication Details
- Medical physics (Lancaster), Vol.36(5), pp.1711-1716
- DOI
- 10.1118/1.3116362
- PMID
- 19544788
- ISSN
- 0094-2405
- eISSN
- 2473-4209
- Number of pages
- 6
- Grant note
- DE-GF07-05ID14700 / DOE
- Language
- English
- Date published
- 05/2009
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Radiation Oncology
- Record Identifier
- 9984046809402771
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