Gafchromic EBT2필름과 다양한 검출기를 이용하여3 cm2 이하의 소조사면에서 출력비율의 선량검증

Title
Gafchromic EBT2필름과 다양한 검출기를 이용하여3 cm2 이하의 소조사면에서 출력비율의 선량검증
Other Titles
Dosimetric Verifications of the Output Factors in the Small Field Less Than 3 cm2 Using the Gafchromic EBT2 Films and the Various Detectors
Author(s)
김성규오세안[오세안]예지원이레나[이레나]박헌보[박헌보]
Keywords
소조사면; 출력비율; EDGE 검출기; Gafchromic EBT2 필름; Small field; Output factors; EDGE detector; Gafchromic EBT2 film
Issue Date
201412
Publisher
한국의학물리학회
Citation
의학물리, v.25, no.4, pp.218 - 224
Abstract
The small field dosimetry is very important in modern radiotherapy because it has been frequently usedto treat the tumor with high dose hypo-fractionated radiotherapy or high dose single fraction stereotacticradiosurgery (SRS) with small size target. But, the dosimetry of a small field (<3×3 cm2) has been greatchallenges in radiotherapy. Small field dosimetry is difficult because of (a) a lack of lateral electronicequilibrium, (b) steep dose gradients, and (c) partial blocking of the source. The objectives of this studywere to measure and verify with the various detectors the output factors in a small field (<3 cm) forthe 6 MV photon beams. Output factors were measured using the CC13, CC01, EDGE detector,thermoluminescence dosimeters (TLDs), and Gafchromic EBT2 films at the sizes of field such as0.5×0.5, 1×1, 2×2, 3×3, 5×5, and 10×10 cm2. The differences in the output factors with the variousdetectors increased with decreasing field size. Our study demonstrates that the dosimetry for a smallphoton beam (<3×3 cm2) should use CC01 or EDGE detectors with a small active volume. And also,Output factors with the EDGE detectors in a small field (<3×3 cm2) coincided well with the GafchromicEBT2 films. 
URI
http://hdl.handle.net/YU.REPOSITORY/30271http://dx.doi.org/10.14316/pmp.2014.25.4.218
ISSN
1226-5829
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의과대학 > 방사선종양학교실 > Articles
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