DEVELOPMENT AND EVALUATION OF A PHANTOM FOR  MULTI-PURPOSE DOSIMETRY IN INTENSITY-MODULATED  RADIATION THERAPY

HAE SUN JEONG; YOUNGYIH HAN; 금오연; 김찬형; JOO HWAN PARK

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자료유형: 학술저널

저자정보: HAE SUN JEONG YOUNGYIH HAN 금오연 김찬형 JOO HWAN PARK

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제43권 제4호

발행연도: 2011.1

수록면: 399 - 404 (6page)

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A LEGO-type multi-purpose dosimetry phantom was developed for intensity-modulated radiation therapy (IMRT),which requires various types of challenging dosimetry. Polystyrene, polyethylene, polytetrafluoroethylene (PTFE), and polyurethane foam (PU-F) were selected to represent muscle, fat, bone, and lung tissue, respectively, after considering the relevant mass densities, elemental compositions, effective atomic numbers, and photon interaction coefficients. The phantom, which is composed of numerous small pieces that are similar to LEGO blocks, provides dose and dose distribution measurements in homogeneous and heterogeneous media. The phantom includes dosimeter holders for several types of dosimeters that are frequently used in IMRT dosimetry. An ion chamber and a diode detector were used to test dosimetry in heterogeneous media under radiation fields of various sizes. The data that were measured using these dosimeters were in disagreement when the field sizes were smaller than 1.5 1.5 cm2 for polystyrene and PTFE, or smaller than 3 3 cm2 for an air cavity. The discrepancy was as large as 41% for the air cavity when the field size was 0.7 0.7 cm2, highlighting one of the challenges of IMRT small field dosimetry. The LEGO-type phantom is also very useful for two-dimensional dosimetry analysis, which elucidates the electronic dis-equilibrium phenomena on or near the heterogeneity boundaries.

#IMRT #Phantom #Dosimetry #Heterogeneity

참고문헌 (19)

참고문헌 신청

/ / National Institute of Standards and Technology (NIST)

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