Clinical tests of large area thermoluminescent detectors under radiotherapy beams

被引:9
作者
Marrazzo, L. [1 ]
Pallotta, S. [2 ]
Klosowski, M. [3 ]
Czopyk, L. [3 ]
Bucciolini, M. [2 ]
Olko, P. [3 ]
Waligorski, M. P. R. [4 ]
机构
[1] Azienda Osped Univ Careggi, SOD Fis Med, I-50134 Florence, Italy
[2] Univ Florence, Dept Clin Physiopathol, I-50134 Florence, Italy
[3] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland
[4] Maria Sklodowska Curie Mem Inst Oncol, Ctr Oncol, PL-31115 Krakow, Poland
关键词
TLD sheets; 2-D dose verification; Full plan dose verification; GAFCHROMIC EBT FILM; QUALITY-ASSURANCE; DOSIMETRIC CHARACTERIZATION; QUANTITATIVE-EVALUATION; ENERGY-DEPENDENCE; IMRT; IMPLEMENTATION; THERAPY; PHANTOM;
D O I
10.1016/j.radmeas.2013.02.006
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
Two-dimensional (2D) thermoluminescence (TL) dosimetry systems based on LiF:Mg,Cu,P, together with the newly developed, based on CaSO4:Dy, were tested under radiotherapy beams. The detectors were irradiated in a water phantom with 6 MV X-ray beams from linac and read with a dedicated TLD reader. Dose distributions of differently shaped fields and of a full stereotactic plan were measured and compared with planned distributions. Maximum distance-to-agreement (DTA) in the penumbra region was 1 mm for both LiF:Mg,Cu,P and CaSO4:Dy U sheets, for all the measured fields. Maximum percentage dose difference (DA%) between planned and measured dose value in low dose gradient regions was up to 11% for LiF:Mg,Cu,P TL sheets and 18% for CaSO4:Dy TL sheets. Concerning the full stereotactic plan, the percentage of points with gamma-index below 1 is 54.9% for the LiF:Mg,Cu,P-based foil and 96.9% for the CaSO4:Dy U sheets. Both 2D detector types can be considered to be a promising tool for bi-dimensional dose measurements in radiotherapy. Non-homogeneity, presumably due to the TL sheets manufacture, still affects dosimetric distribution and the agreement between planned and measured distributions may depend on the chosen sample. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:25 / 30
页数:6
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