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조정희,방동완,박재일,Jo, Jeong-Hui,Bang, Dong-Wan,Park, Jae-Il 대한방사선치료학회 1996 大韓放射線治療技術學會誌 Vol.8 No.1
When high energy photon beam is incident upon an air cavity interface the effect of ionization build-up observed . This phenomenon is resulting from the surface layers of the lesions are significant deficiency of electrons reaching the layers because of the replacement, of solid scattering material by the air cavity, that is lack of electronic equilibrium. Measurement have been made in an acrylic phantom with a parallel plate chamber and high energy photon beams, CO-60, 4MV, 6MV and 10MV X-rays have been investigated. The result of our study show that a significant effect was measured and was determined to be very dependent on field size, air cavity dimension and photon energy. The reductions were much larger for 10MV beam, underdosage at the interface was 12, 12.2, 16.9 and $20.6\%$ for the CO-60, 4MV, 6MV and 10MV, respectively. It was found that this non-equilibrium effect at the interface is more severe for the higher energy beams than that of lower energy beams and the larger cavity dimensions the larger beam reductions occur. This problem is of clinical concern when lesions such as carcinoma beyond air cavities are irradiated, such as larynx, glottic and the patients with maxillectomy and ethmoidectomy and so forth.
제5차 대한간학회 춘계학술대회 초록집 : 포스터 전시 순서 ; 다발성 신농양을 동반한 원발성 담즙성 간경변증 1예
신정우 ( Sin Jeong U ),김인호 ( Kim In Ho ),최정 ( Choe Jeong ),송일한 ( Song Il Han ),임창영 ( Im Chang Yeong ),김정원 ( Kim Jeong Won ),노임환 ( No Im Hwan ),조종태 ( Jo Jong Tae ),조정희 ( Jo Jeong Hui ) 대한간학회 1999 Clinical and Molecular Hepatology(대한간학회지) Vol.5 No.1(S)
조영제 사용 전${\cdot}$후 불균질 조직 보정 알고리즘에 따른 선량변화에 대한 연구
김주호,조정희,이석,전병철,박재일,Kim, Ju-Ho,Jo, Jeong-Hui,Lee, Seok,Jeon, Byeong-Cheol,Park, Jae-Il 대한방사선치료학회 2001 大韓放射線治療技術學會誌 Vol.13 No.1
Purpose : The aim of this study is to investigate the effect of tissue inhomogeneities when appling to contrast medium among Homogeneous, Batho and ETAR dose calculation method in RTP system. Method and Material : We made customized heterogeneous phantom it filled with water or contrast medium slab. Phantom scan data have taken PQ 5000 (CT scanner, Marconi, USA) and then dose was calculated in 3D RTP (AcQ-Plan, Marconi, USA) depends on dose calculation algorithm (Homogeneous, Batho, ETAR). The dose comparisons were described in terms of 2D isodose distribution, percent depth dose data, effective path length and monitor unit. Also dose distributions were calculated with homogeneous and inhomogeneous correction algorithm, Batho and ETAR, in each patients with different clinical sites. Results : Result indicated that Batho and ETAR method gave rise to percent depth dose deviation $1.5{\sim}2.7\%,\;2.3{\sim}3.5\%$ (6MV, field size $10{\times}10cm^2$) in each status with and without contrast medium. Also show that effective path lengths were more increase in contrast status (23.14 cm) than Non-contrast (22.07 cm) about $4.9\%$ or 10.7 mm (In case Hounsfield Unit 270) and these results were similary showned in each patient with different clinical site that was lung. prostate, liver and brain region. Concliusion : In conclusion we shown that the use of inhomogeneity correction algorithm for dose calculation in status of injected contrast medium can not represent exact dose at GTV region. These results mean that patients will be more irradiated photon beam during radiation therapy.