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1
題名:預防動靜脈?管阻塞之狹長型電子射束劑量分析     (32點)
DOSIMETRY OF SMALL AND ELONGATED ELECTRON BEAMS FIELDS FOR PREVENTING ARTERIOVENOUS FISTULA STENOSIS
著者:柯卉玲(Hui-Ling Ko) ;許淑惠(Shu-Hui Hsu) ;蕭安成(An-Cheng Shiau) ;李俊信(Jason J. S. Lee) ;林芳仁(Fang-Jen Lin) ;季匡華(Kwan-Hwa Chi)
出版地區:台灣
出版城市:台北市
學科:醫學綜合
關鍵字:電子射線 ; 動靜脈?管 ; 狹長型照野 ; Electron beam ; Arteriovenous fistula ; Small and elongated fields
刊名:放射治療與腫瘤學
頁碼:157-172
語言:繁體中文
摘要: 中文摘要PDF ; 英文摘要PDF

且且:本研究是想瞭解電子射束在狹長型照野中所產生自l明量特性,量測其( 1 )中心軸百分深度劑量值( pe rce n t depth dose of ce n甘al a xis ) 、(2) 照野因子(ou tpu t facto r ) 、(3) 劑量分佈(isodosedistribution ) ,提供一套劑量參考系統,不僅對於未來動靜脈癢管放射線?那方阻塞上能有所助益,也可提供小藍圖的皮膚站買頸部病姓之電子射線治療確七朋劑量遵循參考。 組輩革且主法:針對臨床上較常使用的八種照野來i~t量測與分析,包含2 X 5 、3 X 5 、4 X 5 、5 X 5 、2 X 10 、3 X 10 、4 X 10 、5 X 10 cm 2 ,戶牙齒辜的能量為動靜脈棲智主常使用的三種能量,包含6、B 、1 0 MeV '而使用的直線力居室器為S i em e n s K DS -2 並搭配的cm 的1 0 X10 cm 2 電子錐筒( ele ctron con e ) ,而射源到假體表面距離( so u r c e- to- su rf a ce distance , SSD)為1 0 0 cm 0 臺則其( 1 ) 中心軸百分深度劑量值( pe 陀e n t de pth dose of cen tra I axis ) 、( 2 ) 照野因子( ou tpu t factor ) 、(3) 劑量分佈(isodose di 的ib utio n ) 。為7產生狹小R恩野, 必須利用電子射束遮擋塊( e l e c tr o n b lock ) 來達到目的, 而遮擋塊放置的位置會影響電子射束的劑量分佈, 所以在本研究中也比較兩種遮擋塊位置(置於電子錐筒及假體表面) 不同所造成的劑量分佈、百分深度劑量值及照野因子的改變,以捏供日後臨末使用時參考。 益基舉畫畫ifti :在百分瀾荳劑量方面可以觀察出當深度小於d m制時, 狹長型照野相對於正方形照野有較高的百分深度劑量值;而深度大於d m ax 時,卻有相反的趨勢。此外,針對遮擋塊位於電子錐筒下方與假體表面的研究顯示,當ill輯塊位於電子錐筒下方時有較少的低能量散射電子, 使得百分深度劑量值的表現介於正方形照野與遮擋塊位於假體表面二者之間。在照野因子方面,當照野較小時,照野因子也較小,此外,當遮擋塊位於電子錐筒下方時,照野因子比沒有遮擋鉛塊有更劇烈的變化。在等劑量曲線分佈方面當遮擋塊位於電子錐筒下方時,等劑量曲線呈現較為鬆散的分佈。因此臨床上,遮擋塊的位置應儘可能的接近體表。等劑量曲線在高劑量區有明顯內縮情形,當能量愈大及照野愈小時,其內縮情況愈嚴重。因此,由本實驗可提供一套針對小而狹長型電子射束照野的劑量參考系統,不僅對於未來動靜脈棲管放射線預防再阻塞上能有所助益,也可應用車蚓、範圍的皮膚照射或E頁頸部病社之電子車拼寫台療劑量計算所參考。
Purpose : The purpose of this study is to evaluate dose distribution of small and elongated electron beam fields for further reference in arterio-venous fistula treatment. The percent depth dose, isodose curve, and output factor were measured as a function of electron energies and field sizes to provide a practical reference dose system. Material and Methods : According to clinical practices , eight field sizes were measured (including 2 ×5, 3 ×5, 4 ×5, 5 ×5, 2 ×10, 3 ×10, 4 ×10, 5 ×10 cm2) and energy of 6, 8, 10 MeV generated by SIEMENS KDS-2 Linac were used in this study. The distance from source to surface (SSD) is 100cm. To generate small and elongated field, the electron blocks were used in our study, and percent depth dose, isodose curves, and output factor were also compared with blocks on electron cone and on phantom surface. Result and Discussion : The percent depth dose, isodose curve, and output factor were measured as a function of electron energies and field sizes. The Dmax shifts towards the surface as the electron beam field size reduced. The smaller the field sizes, the greater the surface dose, and the dose fall-off region becomes more gradual. If the mean size of arterio-venous fistula is 1.5 cm in length and 5mm in width, the safe margin should add 8mm more for long and short axis to cover treatment target adequately. The closer between cerrobend blocks and skin, the better the dose distribution will be. Conclusion : The dialysis accesses (arterio-venous fistula) are suitable for electron-beam therapy because of their superficial location. The electron fields for arterio-venous fistula are usually small and elongated, dose distribution are usually unpredictable by conventional calculation table. The study provides a practical reference dose system for small and elongated field size electron beam dose calculation not only for arterio-venous fistula therapy, but also for skin, head and neck area treatment.


    

本卷期目次
放射治療與腫瘤學
Metaplastic Carcinoma of the Breast: One Case Report and Literature Review/ Daniel WinardiShi-Long LianChih-Jen HuangKun-Bow TsaiJui-Sheng HsuMing-Feng Hou
Treatment Results of Langerhans Cell Histiocytosis: A Long Term Follow-Up/ Chun-Shu LinJing-Min HwangYee-Min JenYi-Jen PengLi-Ping ChangHsing-Lung ChaoDai-Wei LiuHon-Yi LinWeng-Yoon Shum
Granulocytic Sarcoma of the Uterine Cervix: A Case Report and Review of the Literature / Ming-Yii HuangShi-Long LianChih-Jen HuangSheng-Fung LinKun-Bow TsaiCheng-Hui Yang
癌症患者放射治療後迴診追蹤中斷的原因及分析/ 林奎利郭珍妮林立青林逢嘉蘇玫綺
Bile Duct Cancer, Its Survival and Local-Control after Radiotherapy/ Fu-Ti ChangNgan-Ming TsangYou-Kang ChangWai-Man Leung
預防動靜脈瘻管阻塞之狹長型電子射束劑量分析/ 柯卉玲許淑惠蕭安成李俊信林芳仁季匡華
An Evaluation of the Contents and Quality of Radiation Oncology Homepages in Taiwan/ Yu-Jie HuangChong-Jong WangChang-Yu WangChing-Hui HsiehShiao-Hen Chang
頭頸部放射治療的活體劑量驗證/ 王慧娟羅素花董傳中吳嘉明王重榮
BILE DUCT CANCER, ITS SURVIVAL AND LOCAL-CONTROL AFTER RADIOTHERAPY/ Fu-Ti ChangNgan-Ming TsangYou-Kang ChangWai-Man Leung
AN EVALUATION OF THE CONTENTS AND QUALITY OF RADIATION ONCOLOGY HOMEPAGES IN TAIWAN/ Yu-Jie HuangChong-Jong WangChang-Yu WangChing-Hui HsiehShiao-Hen Chang
癌症患者放射治療後迴診追蹤中斷的原因及分析/ 林奎利郭珍妮林立青林逢嘉蘇玫綺
預防動靜脈?管阻塞之狹長型電子射束劑量分析/ 柯卉玲許淑惠蕭安成李俊信林芳仁季匡華
頭頸部放射治療的活體劑量驗證/ 王慧娟羅素花董傳中吳嘉明王重榮陳惠君
TREATMENT RESULTS OF LANGERHANS CELL HISTIOCYTOSIS: A LONG TERM FOLLOW-UP/ Chun-Shu LinJing-Min HwangYee-Min JenYi-Jen PengLi-Ping ChangHsing-Lung ChaoDai-Wei LiuHon-Yi LinWeng-Yoon Shum
GRANULOCYTIC SARCOMA OF THE UTERINE CERVIX: A CASE REPORT AND REVIEW OF THE LITERATURE/ Ming-Yii HuangShi-Long LianChih-Jen HuangSheng-Fung LinKun-Bow TsaiCheng-Hui Yang
METAPLASTIC CARCINOMA OF THE BREAST: ONE CASE REPORT AND LITERATURE REVIEW/ Daniel WinardiShi-Long LianChih-Jen HuangKun-Bow TsaiJui-Sheng HsuMing-Feng Hou
 
   
 
   

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