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Title: SU-F-T-175: Absorbed Dose Measurement Using Radiophotoluminescent Glass Dosimeter in Therapeutic Proton Beam

Abstract

Purpose: To measure the absorbed dose to water Dw in therapeutic proton beam with radiophotoluminescent glass dosimeter (RGD), a methodology was proposed. In this methodology, the correction factor for the LET dependence of radiophotoluminescent (RPL) efficiency and the variation of mass stopping power ratio of water to RGD (SPRw, RGD) were adopted. The feasibility of proposed method was evaluated in this report. Methods: The calibration coefficient in terms of Dw for RGDs (GD-302M, Asahi Techno Glass) was obtained using 60Co beam. The SPRw, RGD was calculated by Monte Carlo simulation toolkit Geant4. The LET dependence of RPL efficiency was investigated experimentally by using a 70 MeV proton beam at National Institute of Radiological Sciences. For clinical usage, the residual range Rres was used as a quality index to determine the correction factor for RPL efficiency. The proposed method was evaluated by measuring Dw at difference depth in the 200 MeV proton beam. Results: For both modulated and non-modulated proton beam, the SPRw, RGD increases more than 3 % where Rres are less than 1 cm. RPL efficiency decreases with increasing LET and it reaches 0.6 at LET of 10 keV µm{sup −1}. Dw measured by RGD (Dw, RGD) shows goodmore » agreement with that measured by ionization chamber (Dw, IC) and the relative difference between Dw, RGD and Dw, IC are within 3 % where Rres is larger than 1 cm. Conclusion: In this work, a methodology for using RGD in proton dosimetry was proposed and the SPRw, RGD and the LET dependence of RPL efficiency in therapeutic proton beam was investigated. The results revealed that the proposed method is useful for RGD in the dosimetry of proton beams.« less

Authors:
 [1];  [2];  [3];  [1];  [2];  [2]; ;  [1];  [4]
  1. Tokyo Metropolitan University, Tokyo, Tokyo (Japan)
  2. (Japan)
  3. National Institute of Radiological Sciences, Chiba, Chiba (Japan)
  4. Nagoya Proton Therapy Center, Nagoya City West Medical, Kita-ku, Nagoya (Japan)
Publication Date:
OSTI Identifier:
22642416
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 43; Journal Issue: 6; Other Information: (c) 2016 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPES AND RADIATION SOURCES; 60 APPLIED LIFE SCIENCES; ABSORBED RADIATION DOSES; COBALT 60; COMPUTERIZED SIMULATION; DOSEMETERS; EFFICIENCY; GLASS; IONIZATION CHAMBERS; KEV RANGE 01-10; MEV RANGE 100-1000; MEV RANGE 10-100; MONTE CARLO METHOD; PROTON BEAMS; PROTON DOSIMETRY

Citation Formats

Chang, W, National Institute of Radiological Sciences, Chiba, Chiba, Koba, Y, Katayose, T, National Institute of Radiological Sciences, Chiba, Chiba, Chiba Cancer Center, Chuo-ku, Chiba, Hariu, M, Saitoh, H, and Yasui, K. SU-F-T-175: Absorbed Dose Measurement Using Radiophotoluminescent Glass Dosimeter in Therapeutic Proton Beam. United States: N. p., 2016. Web. doi:10.1118/1.4956312.
Chang, W, National Institute of Radiological Sciences, Chiba, Chiba, Koba, Y, Katayose, T, National Institute of Radiological Sciences, Chiba, Chiba, Chiba Cancer Center, Chuo-ku, Chiba, Hariu, M, Saitoh, H, & Yasui, K. SU-F-T-175: Absorbed Dose Measurement Using Radiophotoluminescent Glass Dosimeter in Therapeutic Proton Beam. United States. doi:10.1118/1.4956312.
Chang, W, National Institute of Radiological Sciences, Chiba, Chiba, Koba, Y, Katayose, T, National Institute of Radiological Sciences, Chiba, Chiba, Chiba Cancer Center, Chuo-ku, Chiba, Hariu, M, Saitoh, H, and Yasui, K. Wed . "SU-F-T-175: Absorbed Dose Measurement Using Radiophotoluminescent Glass Dosimeter in Therapeutic Proton Beam". United States. doi:10.1118/1.4956312.
@article{osti_22642416,
title = {SU-F-T-175: Absorbed Dose Measurement Using Radiophotoluminescent Glass Dosimeter in Therapeutic Proton Beam},
author = {Chang, W and National Institute of Radiological Sciences, Chiba, Chiba and Koba, Y and Katayose, T and National Institute of Radiological Sciences, Chiba, Chiba and Chiba Cancer Center, Chuo-ku, Chiba and Hariu, M and Saitoh, H and Yasui, K},
abstractNote = {Purpose: To measure the absorbed dose to water Dw in therapeutic proton beam with radiophotoluminescent glass dosimeter (RGD), a methodology was proposed. In this methodology, the correction factor for the LET dependence of radiophotoluminescent (RPL) efficiency and the variation of mass stopping power ratio of water to RGD (SPRw, RGD) were adopted. The feasibility of proposed method was evaluated in this report. Methods: The calibration coefficient in terms of Dw for RGDs (GD-302M, Asahi Techno Glass) was obtained using 60Co beam. The SPRw, RGD was calculated by Monte Carlo simulation toolkit Geant4. The LET dependence of RPL efficiency was investigated experimentally by using a 70 MeV proton beam at National Institute of Radiological Sciences. For clinical usage, the residual range Rres was used as a quality index to determine the correction factor for RPL efficiency. The proposed method was evaluated by measuring Dw at difference depth in the 200 MeV proton beam. Results: For both modulated and non-modulated proton beam, the SPRw, RGD increases more than 3 % where Rres are less than 1 cm. RPL efficiency decreases with increasing LET and it reaches 0.6 at LET of 10 keV µm{sup −1}. Dw measured by RGD (Dw, RGD) shows good agreement with that measured by ionization chamber (Dw, IC) and the relative difference between Dw, RGD and Dw, IC are within 3 % where Rres is larger than 1 cm. Conclusion: In this work, a methodology for using RGD in proton dosimetry was proposed and the SPRw, RGD and the LET dependence of RPL efficiency in therapeutic proton beam was investigated. The results revealed that the proposed method is useful for RGD in the dosimetry of proton beams.},
doi = {10.1118/1.4956312},
journal = {Medical Physics},
number = 6,
volume = 43,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2016},
month = {Wed Jun 15 00:00:00 EDT 2016}
}