PIXEL-BASED CORRECTION METHOD FOR GAFCHROMIC®EBT FILM DOSIMETRY

HAE SUN JEONG; YOUNGYIH HAN; 금오연; 김찬형; SANG GYU JU; JUNG SUK SHIN; 김진성; JOO HWAN PARK

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자료유형: 학술저널

저자정보: HAE SUN JEONG YOUNGYIH HAN 금오연 김찬형 SANG GYU JU JUNG SUK SHIN 김진성 JOO HWAN PARK

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제42권 제6호

발행연도: 2010.1

수록면: 670 - 679 (10page)

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In this paper, a new approach using a pixel-based correction method was developed to fix the non-uniform responses offlat-bed type scanners used for radiochromic film dosimetry. In order to validate the method’s performance, two cases weretested: the first consisted of simple dose distributions delivered by a single port; the second was a complicated dose distributioncomposed of multiple beams. In the case of the simple individual dose condition, ten different doses, from 8.3 cGy to 307.1cGy, were measured, horizontal profiles were analyzed using the pixel-based correcton method and compared with resultsmeasured by an ionization chamber and results corrected using the existing correction method. A complicated inverse pyramiddose distribution was made by piling up four different field shapes, which were measured with GAFCHROMIC®EBT filmand compared with the Monte Carlo calculation; as well as the dose distribution corrected using a conventional method. Theresults showed that a pixel-based correction method reduced dose difference from the reference measurement down to 1% inthe flat dose distribution region or 2 mm in a steep dose gradient region compared to the reference data, which were ionizationchamber measurement data for simple cases and the MC computed data for the complicated case, with an exception for verylow doses of less than about 10 cGy in the simple case. Therefore, the pixel-based scanner correction method is expected toenhance the accuracy of GAFCHROMIC®EBT film dosimetry, which is a widely used tool for two-dimensional dosimetry.

#EBT Film #Flat-Bed Scanner #Non-Uniform Dose Correction

참고문헌 (19)

참고문헌 신청

/ / ISP Paper / http://www.ispcorp.com/products/dosimetry/ content/gafchromic/content/products/ebt/pdfs/EffectLight. pdf / / Product manual / http://online1.ispcorp.com/_layouts/ Gafchromic/content/products/ebt/pdfs/EBTwhitepaper.pdf A. Sankar / 2006 / Comparison of Kodak EDR2 and Gafchromic EBT Film for Intensity-modulated Radiation Therapy Dose Distribution Verification / Med Dosim 31 : 273 ~

B. E. Nelms / 2007 / A survey on planar IMRT QA analysis / J. Appl. Clin. Med. Phys 8 : 76 ~

C. Fiandra / 2006 / Clinical Use of EBT Model GafchromicTM Film in Radiotherapy / Med. Phys 33 : 4314 ~

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