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

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 de...

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Bibliographic Details
Published in:Medical physics (Lancaster) 2008-02, Vol.35 (2), p.744-752
Main Authors: 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.
Format: Article
Language:English
Subjects:
aneurysm clip
Applications
biomedical MRI
BRAIN
Calibration
COMPUTERIZED SIMULATION
DOSEMETERS
dosimetry
Dosimetry/exposure assessment
Film Dosimetry - methods
Gafchromic film
gel dosimeter
GELS
Humans
Image scanners
Intracranial Aneurysm - radiotherapy
Intracranial Aneurysm - surgery
magnetic resonance imaging
Medical imaging
MONTE CARLO METHOD
Monte Carlo methods
NMR IMAGING
PERTURBATION THEORY
PHANTOMS
Phantoms, Imaging
PLATINUM
Polymerization
RADIATION DOSES
radiation therapy
RADIOLOGY AND NUCLEAR MEDICINE
Radiosurgery
Radiosurgery - methods
RADIOTHERAPY
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted - methods
Reproducibility of Results
Sensitivity and Specificity
Simulation
Stereotactic radiosurgery
stereotactic radiotherapy
SURGERY
Surgical Instruments
TITANIUM
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Description
Summary: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 % .
ISSN:0094-2405
2473-4209
DOI:10.1118/1.2828200