DEVELOPMENT AND EVALUATION OF A PHANTOM FOR MULTI-PURPOSE DOSIMETRY IN INTENSITY-MODULATED RADIATION THERAPY
- Title
- DEVELOPMENT AND EVALUATION OF A PHANTOM FOR MULTI-PURPOSE DOSIMETRY IN INTENSITY-MODULATED RADIATION THERAPY
- Author
- 김찬형
- Keywords
- IMRT; Phantom; Dosimetry; Heterogeneity
- Issue Date
- 2011-08
- Publisher
- KOREAN NUCLEAR SOC, NUTOPIA BLDG, 342-1 JANGDAE-DONG, DAEJEON, 305-308, SOUTH KOREA
- Citation
- Nuclear engineering and technology : an international journal of the Korean Nuclear Society, v.43, no.4, pp.399 - 404
- Abstract
- 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 x 1.5 cm(2) for polystyrene and PTFE, or smaller than 3 x 3 cm(2) for an air cavity. The discrepancy was as large as 41% for the air cavity when the field size was 0.7 x 0.7 cm(2), 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.
- URI
- http://koreascience.or.kr/article/ArticleFullRecord.jsp?cn=OJRHBJ_2011_v43n4_399http://hdl.handle.net/20.500.11754/40456
- ISSN
- 1738-5733; 1225-9292
- DOI
- 10.5516/NET.2011.43.4.399
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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