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Title: SU-F-P-49: Comparison of Mapcheck 2 Commission for Photon and Electron Beams

Abstract

Purpose: We will investigate the performance variation of the MapCheck2 detector array with different array calibration and dose calibration pairs from different radiation therapy machine. Methods: A MapCheck2 detector array was calibrated on 3 Elekta accelerators with different energy of photon (6 MV, 10 MV, 15 MV and 18 MV) and electron (6 MeV, 9 MeV, 12 MeV, 15 MeV, 18 MeV and 20 MeV) beams. Dose calibration was conducted by referring a water phantom measurement following TG-51 protocol and commission data for each accelerator. A 10 cm × 10 cm beam was measured. This measured map was morphed by applying different calibration pairs. Then the difference was quantified by comparing the doses and similarity using gamma analysis of criteria (0.5 %, 0 mm). Profile variation was evaluated on a same dataset with different calibration pairs. The passing rate of an IMRT QA planar dose was calculated by using 3 mm and 3% criteria and compared with respect to each calibration pairs. Results: In this study, a dose variation up to 0.67% for matched photons and 1.0% for electron beams is observed. Differences of flatness and symmetry can be as high as 1% and 0.7% respectively. Gamma analysis shows amore » passing rate ranging from 34% to 85% for the standard 10 × 10 cm field. Conclusion: Our work demonstrated that a customized array calibration and dose calibration for each machine is preferred to fulfill a high standard patient QA task.« less

Authors:
; ; ;  [1]
  1. University of Mississippi Med. Center, Jackson, MS (United States)
Publication Date:
OSTI Identifier:
22626719
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:
60 APPLIED LIFE SCIENCES; 61 RADIATION PROTECTION AND DOSIMETRY; ACCELERATORS; CALIBRATION; DATASETS; ELECTRON BEAMS; PATIENTS; PERFORMANCE; PHANTOMS; RADIATION DOSES; RADIOTHERAPY; SYMMETRY

Citation Formats

Lu, J, Yang, C, Morris, B, and Markovich, A. SU-F-P-49: Comparison of Mapcheck 2 Commission for Photon and Electron Beams. United States: N. p., 2016. Web. doi:10.1118/1.4955756.
Lu, J, Yang, C, Morris, B, & Markovich, A. SU-F-P-49: Comparison of Mapcheck 2 Commission for Photon and Electron Beams. United States. doi:10.1118/1.4955756.
Lu, J, Yang, C, Morris, B, and Markovich, A. Wed . "SU-F-P-49: Comparison of Mapcheck 2 Commission for Photon and Electron Beams". United States. doi:10.1118/1.4955756.
@article{osti_22626719,
title = {SU-F-P-49: Comparison of Mapcheck 2 Commission for Photon and Electron Beams},
author = {Lu, J and Yang, C and Morris, B and Markovich, A},
abstractNote = {Purpose: We will investigate the performance variation of the MapCheck2 detector array with different array calibration and dose calibration pairs from different radiation therapy machine. Methods: A MapCheck2 detector array was calibrated on 3 Elekta accelerators with different energy of photon (6 MV, 10 MV, 15 MV and 18 MV) and electron (6 MeV, 9 MeV, 12 MeV, 15 MeV, 18 MeV and 20 MeV) beams. Dose calibration was conducted by referring a water phantom measurement following TG-51 protocol and commission data for each accelerator. A 10 cm × 10 cm beam was measured. This measured map was morphed by applying different calibration pairs. Then the difference was quantified by comparing the doses and similarity using gamma analysis of criteria (0.5 %, 0 mm). Profile variation was evaluated on a same dataset with different calibration pairs. The passing rate of an IMRT QA planar dose was calculated by using 3 mm and 3% criteria and compared with respect to each calibration pairs. Results: In this study, a dose variation up to 0.67% for matched photons and 1.0% for electron beams is observed. Differences of flatness and symmetry can be as high as 1% and 0.7% respectively. Gamma analysis shows a passing rate ranging from 34% to 85% for the standard 10 × 10 cm field. Conclusion: Our work demonstrated that a customized array calibration and dose calibration for each machine is preferred to fulfill a high standard patient QA task.},
doi = {10.1118/1.4955756},
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}
}