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Title: Determination of dosimetric perturbations caused by aneurysm clip in stereotactic radiosurgery using gel phantoms and EBT-Gafchromic films

Abstract

Some radiotherapy patients are treated with titanium surgical aneurysm clips in the radiation field. This is of particular importance for stereotactic radiosurgery brain treatments, where the length of the blade of the clip may be comparable to the size of the radiation field. This study seeks to determine the extent of the dosimetric effects caused by surgical clips in stereotactic radiosurgery, using polyacrylamide gel phantoms and EBT type Gafchromic films. Using gel phantoms scanned with magnetic resonance imaging scanner, dose enhancement of around 20% was noted at distances less than 2 mm away from the clip surface. Gafchromic films showed about 6% variations in the dose up to few millimeters from the clip. These experimental results confirmed results predicted by Monte Carlo simulation techniques for higher density material surgical clips such as lead and platinum. Moreover, these experimental measurements clearly indicate dose reduction due to radiation attenuation behind the clip of about 4%.

Authors:
; ; ; ; ; ; ; ; ; ; ;  [1]
  1. School of Medical Sciences, RMIT University, Bundoora, Victoria 3083 (Australia)
Publication Date:
OSTI Identifier:
21036167
Resource Type:
Journal Article
Journal Name:
Medical Physics
Additional Journal Information:
Journal Volume: 35; Journal Issue: 2; Other Information: DOI: 10.1118/1.2828200; (c) 2008 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-2405
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; BRAIN; COMPUTERIZED SIMULATION; DOSEMETERS; FILMS; GELS; MONTE CARLO METHOD; NMR IMAGING; PERTURBATION THEORY; PHANTOMS; PLATINUM; RADIATION DOSES; RADIOTHERAPY; SURGERY; TITANIUM

Citation Formats

Geso, M, Ackerly, T, Brown, S, Chua, Z, He, C, Wong, C J, Powell, C E, Ho, A, Qiao, G, Solomon, D H, Patterson, W, Droege, J M, Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Victoria 3010, Radiation Oncology Victoria, East Melbourne, Victoria 3002, and William Buckland Radiotherapy Centre, Alfred Hospital, Melbourne, Victoria 3004. Determination of dosimetric perturbations caused by aneurysm clip in stereotactic radiosurgery using gel phantoms and EBT-Gafchromic films. United States: N. p., 2008. Web. doi:10.1118/1.2828200.
Geso, M, Ackerly, T, Brown, S, Chua, Z, He, C, Wong, C J, Powell, C E, Ho, A, Qiao, G, Solomon, D H, Patterson, W, Droege, J M, Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Victoria 3010, Radiation Oncology Victoria, East Melbourne, Victoria 3002, & William Buckland Radiotherapy Centre, Alfred Hospital, Melbourne, Victoria 3004. Determination of dosimetric perturbations caused by aneurysm clip in stereotactic radiosurgery using gel phantoms and EBT-Gafchromic films. United States. https://doi.org/10.1118/1.2828200
Geso, M, Ackerly, T, Brown, S, Chua, Z, He, C, Wong, C J, Powell, C E, Ho, A, Qiao, G, Solomon, D H, Patterson, W, Droege, J M, Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Victoria 3010, Radiation Oncology Victoria, East Melbourne, Victoria 3002, and William Buckland Radiotherapy Centre, Alfred Hospital, Melbourne, Victoria 3004. 2008. "Determination of dosimetric perturbations caused by aneurysm clip in stereotactic radiosurgery using gel phantoms and EBT-Gafchromic films". United States. https://doi.org/10.1118/1.2828200.
@article{osti_21036167,
title = {Determination of dosimetric perturbations caused by aneurysm clip in stereotactic radiosurgery using gel phantoms and EBT-Gafchromic films},
author = {Geso, M and Ackerly, T and Brown, S and Chua, Z and He, C and Wong, C J and Powell, C E and Ho, A and Qiao, G and Solomon, D H and Patterson, W and Droege, J M and Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Victoria 3010 and Radiation Oncology Victoria, East Melbourne, Victoria 3002 and William Buckland Radiotherapy Centre, Alfred Hospital, Melbourne, Victoria 3004},
abstractNote = {Some radiotherapy patients are treated with titanium surgical aneurysm clips in the radiation field. This is of particular importance for stereotactic radiosurgery brain treatments, where the length of the blade of the clip may be comparable to the size of the radiation field. This study seeks to determine the extent of the dosimetric effects caused by surgical clips in stereotactic radiosurgery, using polyacrylamide gel phantoms and EBT type Gafchromic films. Using gel phantoms scanned with magnetic resonance imaging scanner, dose enhancement of around 20% was noted at distances less than 2 mm away from the clip surface. Gafchromic films showed about 6% variations in the dose up to few millimeters from the clip. These experimental results confirmed results predicted by Monte Carlo simulation techniques for higher density material surgical clips such as lead and platinum. Moreover, these experimental measurements clearly indicate dose reduction due to radiation attenuation behind the clip of about 4%.},
doi = {10.1118/1.2828200},
url = {https://www.osti.gov/biblio/21036167}, journal = {Medical Physics},
issn = {0094-2405},
number = 2,
volume = 35,
place = {United States},
year = {Fri Feb 15 00:00:00 EST 2008},
month = {Fri Feb 15 00:00:00 EST 2008}
}