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김영범,황웅구,김유현,Kim, Young-Bum,Whang, Woong-Ku,Kim, You-Hyun 대한방사선치료학회 1994 大韓放射線治療技術學會誌 Vol.6 No.1
Proper evaluation about the penumbra is very important to improve the efficacy of radiation theraphy. There are two kinds of physical penumbra, geometric penumbra and transmission penumbra. In this study, we evaluated the variation of physical penumbra according to the varing enery level, changing the field size and depth. Physical penumbra width was decreased as the source size decreased, and as the SDD increased, but the consideration about the scatter radiation and mechanical stability is an important factor. For the two adjacent beams, upper collimator should be used and especially for Co-60 unit, it is efficient to use the extended collimator.
'Acryl판을 이용한 Moving Strip과 Mantle 치료 방법에 대한 고찰'
권영호,황웅구,김유현 대한방사선치료학회 1987 大韓放射線治療技術學會誌 Vol.2 No.1
Moving Strip과 Mantle치료 방법에 의한 환자 치료시 종래 치료 방법에 의해서 나타난 문제점들을 개선 해 보고자 아래의 방법을 고안하게 되었다. 이 치료 방법의 목적은 치료범위를 정확하게 재현하고 치료하는 전 기간 동안 환자가 치료 범위를 몸에 표시하고 있어야 하는 불편을 없애기 위함이다. 이 방법은 경제적인 부담이없이 저렴하고 만들기가 쉽다는 장점이 있다.
Tungsten eyeball shield block의 임상적용에 관한 고찰
정덕양,이병구,황웅구,Jeong, Deok-Yang,Lee, Byoung-Koo,Hwang, Woong-Koo 대한방사선치료학회 2002 大韓放射線治療技術學會誌 Vol.14 No.1
I. 목적 : Sebaceous gland carcinoma, Squamouse cell ca., basal cell ca., low grade MALToma 등에서 전자선을 이용하여 eyelid 치료시 안구의 선량은 될 수 있는 한 최소선량으로 관리되어야 한다. 그러나 upper나 lower eyelid 전부를 포함하는 조사면은 치료후 백내장등의 심각한 부작용을 만들어 낼 수 있다. 본원에서는 상용되는 Tungsten eyeball shielding block과 기존의 lead block에 의한 차폐시 안구의 선량을 비교하여 Tungsten eyeball shielding block의 유용성에 대해 평가해 보고자한다. 2. 재료 및 방법: 시판되고 있는 BOLX-I 물질을 이용하여 모형안구를 제작하고 안구의 6곳 주요지점을 선정한 후 TLD chip을 이용하여 주로 사용되는 6MeV와 9MeV electron beam의 선량을 측정, Tungsten eyeball shielding block과 lead block의 선량을 비교하였다. 3. 결과 : Tungsten eyeball shielding block의 사용이 안구의 주요 지점인 각막, 망막, 시신경부위의 선량을 lead block사용 때보다 $90\%$에서 $50\%$의 감소효과가 있었다. 4. 결론 : Tungsten eyeball shielding block은 6MeV 전자선 치료시 보다 뛰어난 차폐효과를 보여 임상에서의 유용성이 인정되었다. 그러나 안구에 삽입시 환자의 고통과 불쾌감을 줄일 수 있는 방안이 모색되어야 하는 숙제를 남겼다. During radiation therapy with electron beam to eyelid, we must keep the minimal dose on eyeball as possible. especially in the treatment of Sebaceous gland carcinoma, Squamouse cell ca., and basal cell ca. of eyelid and low grade MALToma etc. But if radiation field covered the upper & lower eyelid, it makes a cataract on lens of treated eye, in late complications. Now we reports the advantages of Tungsten eyeball shielding block compare to previously used lead block. with BOLX-I material, we made a eyeball model and measured the absorbed dose of 6MeV & 9MeV electron hem at 6 point of eyeball model with TLD chip. And compare the absorbed dose to previously lead block and other types of Tungsten eyeball shielding block.
전자선 조사야 결합부분의 선량분포 개선을 위한 Acrylic Electron Wedge의 제작 및 사용
김영범,권영호,황웅구,김유현,Kim Young Bum,Kwon Young Ho,Whang Woong Ku,Kim You Hyun 대한방사선치료학회 1998 大韓放射線治療技術學會誌 Vol.10 No.1
Treatment of a large diseased area with electron often requires the use of two or more adjoining fields. In such cases, not only electron beam divergence and lateral scattering but also fields overlapping and separation may lead to significant dose inhomogeneities(${\pm}20\%$) at the field junction area. In this study, we made Acrylic Electron Wedges to improve dose homogeneities(${\pm}5\%$) in these junction areas and considered application it to clinical practices. All measurements were made using 6, 9, 12, 16, 20MeV Electron beams from a linear accelerator for a $10{\times}10cm$ field at 100cm SSD. Adding a 1 mm sheet of acryl gradually from 1 mm to 15 mm, We acquired central axis depth dose beam profile and isodose curves in water phantom. As a result, for all energies, the practical range was reduced by approximately the same distance as the thickness of the acryl insert, e.g. a 1 mm thick acryl insert reduce the practical range by approximately 1 mm. For every mm thickness of acryl inserted, the beam energy was reduced by approximately 0.2MeV. These effects were almost independent of beam energy and field size. The use of Acrylic Electron Wedges produced a small increase $(less\;than\;3\%)\;in\;the\;surface\;dose\;and\;a\;small\;Increase(less\;than\;1\%)$ in X-ray contamination. For acryl inserts, thickness of 3 mm or greater, the penumbra width increased nearly linear for all energies and isodose curves near the beam edge were nearly parallel with the incident beam direction, and penumbra width was $35\;mm{\sim}40\;mm$. We decide heel thickness and angle of the wedge at this point. These data provide the information necessary to design Acrylic Electron Wedge which can be use to improve dose uniformity at electron field junctions and it will be effectively applicated in clinical practices.