Korean J Med Phys.  2007 Mar;18(1):13-19.

Determination of Output Factors for the Gamma Knife using a Radiophotoluminescent Glass Rod Detector

Affiliations
  • 1Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea. suhsanta@catholic.ac.kr
  • 2Gamma Knife Center, Kyung Hee University Medical Center.
  • 3Department of Radiation Oncology, College of Medicine, Kyung Hee University.
  • 4Radiation Health Research Institute.

Abstract

The purpose of study is to investigate whether glass rod detector (GRD) would be suitable for dosimeter of radiotherapy units. A GRD is used for the measurement of the output factors and x-axis beam profiles from Gamma Knife. The output factors measured with GRD from the 14, 8 and 4 mm collimators relative to the 18 mm collimator are 0.980+/-0.013, 0.949+/-0.013 and 0.872+/-0.012, respectively. The output factors obtained with a GRD are within 1.0% in good agreement with the values recommended by the manufacture. The full width at half maximum (FWHM) of x-axis beam profiles measured with GRD are 5.9 mm at a 4 mm collimator.

Keyword

Radiophotoluminescent glass rod detector; Output factor; x-axis dose profile; FWHM

MeSH Terms

Glass*
Radiotherapy
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