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頁籤選單縮合
題名 | 化學氣相沉積鑽石薄膜運用於放射治療空腔劑量量測之研究=The Study of Chemical Vapor Deposition Diamond Films for Radiotherapy Air Cavity Dose |
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作者姓名(中文) | 丁健益; 林招膨; 黃文濤; 朱鐵吉; | 書刊名 | 臺灣應用輻射與同位素雜誌 |
卷期 | 3:1 2007.03[民96.03] |
頁次 | 頁243-251 |
分類號 | 416.36 |
關鍵詞 | 化學氣相沉積鑽石薄膜; 空腔劑量; 放射治療; CVD diamond films; Air cavity dose; Radiotherapy; |
語文 | 中文(Chinese) |
中文摘要 | 放射治療中空腔與不同組織界質界面劑量之影響,一直爲放射腫瘤科醫師及醫學物理師所關切的問題。例如鼻咽癌放射治療中鼻咽腔空腔界面劑量或肺癌放射治療胸腔壁空腔界面之劑量。組織內空腔界面電子不平衡可能會導致腫瘤在治療過程中所接受到劑量過多或不足,當所接受劑量不足會引發腫瘤細胞再復發的情形,而過多劑量產生熱區對正常組織亦衍生併發症。 本文使用CVD鑽石薄膜作爲熱發光劑量計,以西門子(Siemens Primus)直線加速器治療機進行不同形狀空腔劑量之研究,利用改變不同形狀之空腔分別爲方形,正三角形,倒三角形及圓形,將CVD鑽石薄膜熱發光劑量計置於不同形狀空腔之界面處進行量測,研究光子射東進入不同組織空腔劑量之變化。結果顯示,在不同形狀假體空腔中,方形空腔界面劑量衰減值到70.8%左右。三角形空腔界面劑量衰減值到70.8%左右。圓形空腔界面劑量衰減值到70.8%左右。爲減少空腔之影響,使用水球來減少空腔體積,結果顯示,在方形所導致之劑量影響衰減值爲84.9%,三角形所導致之劑量影響衰減值減少爲92%,圓形所導致之劑量影響衰減值減少爲90%。研究證實不同組織空腔確實會導致治療界面劑量的不足或過多,所以在臨床放射治療計畫上,需考量空腔界面劑量所造成之影響。實務上可減少使用小照野治療或是減少空腔大小。減少不同組織空腔界面的影響,以增進癌症病患的治療品質。 |
英文摘要 | Clinically, the issue of air cavity interface dose is the major concern of radiation oncologists and medical physicists. Underdosing of the treatment target in radiation therapy can occur when tumors are situated near natural air cavities due to charged particle disequilibrium around air-tissue interfaces. The measurement is performed using a Siemens Primus linear accelerator equipped with 6 MV and 15 MV photons. The study use CVD diamond thermoluminescent dosimeter to measure the air cavity dose. The variables of the problem included x-ray energy, cavity shape and dimension. The study results indicate the square air cavity interface dose increase 18%. In triangular form air cavity interface dose increase 6% and circular form air cavity interface dose increase 8%. In order to reduce air cavity interface dose effect. The adding the water balloon in air cavity to reduce air cavity content will improve electron disequilibrium effect. |
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