Application of IAEA TRS-398 Protocol to Gamma Knife Model C / 의학물리
Korean Journal of Medical Physics
;
: 194-201, 2007.
Article
in Korean
| WPRIM
| ID: wpr-213246
ABSTRACT
Although Gamma Knife irradiates much more radiation in a single session than conventional radiotherapy, there were only a few studies to measure absolute dose of a Gamma Knife. Especially, there is no report of application of International Atomic Energy Agency (IAEA) TRS-398 which requires to use a water phantom in radiation measurement to Gamma Knife. In this article, the authors reported results of the experiments to measure the absorbed dose to water of a Gamma Knife Model C using the IAEA TRS-398 protocol. The absorbed dose to water of a Gamma Knife model C was measured using a water phantom under conditions as close as possible to the IAEA TRS-398 protocol. The obtained results were compared with values measured using the plastic phantom provided by the Gamma Knife manufacturer. Two Capintec PR-05P mini-chambers and a PTW UNIDOS electrometer were used in measurements. The absorbed dose to water of a Gamma Knife model C inside the water phantom was 1.38% larger than that of the plastic phantom. The current protocol provided by the manufacturer has an intrinsic error stems from the fact that a plastic phantom is used instead of a water phantom. In conclusion, it is not possible to fully apply IAEA TRS-398 to measurement of absorbed dose of a Gamma Knife. Instead, it can be a practical choice to build a new protocol for Gamma Knife or to provide a conversion factor from a water phantom to the plastic phantom. The conversion factor can be obtained in one or two standard laboratories.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Plastics
/
Radiotherapy
/
Water
/
Nuclear Energy
Type of study:
Practice guideline
/
Prognostic study
Language:
Korean
Journal:
Korean Journal of Medical Physics
Year:
2007
Type:
Article
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