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

Journal Article · Fri Feb 15 04:00:00 EST 2008 · Medical Physics

DOI:https://doi.org/10.1118/1.2828200· OSTI ID:21036167

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 ^[1]

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1. School of Medical Sciences, RMIT University, Bundoora, Victoria 3083 (Australia)

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%.

• OSTI ID: 21036167
• Journal Information: Medical Physics, Journal Name: Medical Physics Journal Issue: 2 Vol. 35; ISSN 0094-2405; ISSN MPHYA6
• Country of Publication: United States
• Language: English

Related Subjects

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