Journal
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS
Volume 47, Issue -, Pages 16-22Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ejmp.2018.02.009
Keywords
OSL; Dosimetry; Instrumentation; Computed Tomography; Radiology
Funding
- CNPq (Brazilian National Council for Research and Development) [132554/2015-1]
- CNPq/FAPESP by INCT - Metrology of Ionizing Radiation in Medicine [2008/57863-2]
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This study describes the characterization of an Al2O3:C OSLD (Landauer's Luxel T tape) for dose evaluation in Computed Tomography. The irradiations were conducted using both a constant potential X-ray equipment and a 64-slice clinical CT scanner, and the readouts were performed using a Riso TL/OSL reader. The following aspects were studied: batch homogeneity, energy response, linearity of dose response, reproducibility, reusability, and effect of uncertainties with the normalization of OSL signals per their response to beta radiation. A group of 330 dosimeters from the 452 irradiated with the same dose presented OSL signals within the interval of 4.7% from the average. The dosimeters presented energy-dependent response in good agreement with results found in the literature. The air kerma response of the OSL signal showed a linear trend for both the constant potential X-ray device and the clinical CT scanner, with differences in their slopes of approximately 10%. Reproducibility, reusability, and effect of beta normalization were analyzed by separating 72 dosimeters in 3 groups. The results obtained in this study together with those of previous works indicate that this type of dosimeter is adequate for dose evaluation in CT clinical applications.
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