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題 名 | 楔型濾器在乳房相切照野技術對表面劑量及重要組織器官的影響評估=The Evaluation of Surface Dose and Critical Organ for Tangential Breast Irradiation with Virtual Wedge and Physical Wedge |
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作 者 | 劉幕台; 林招膨; 謝長堯; 黃昭源; 李必忍; 陳苑蓉; 蔡易達; | 書刊名 | 中華放射線醫學雜誌 |
卷 期 | 27:3 2002.06[民91.06] |
頁 次 | 頁103-109 |
分類號 | 416.226 |
關鍵詞 | 乳房腫瘤放射治療; 輻射劑量; 熱發光劑量計; 放射治療技術; Breast neoplasm therapy; Dosimetry; Therapeutic radiology experimental; TLD; |
語 文 | 中文(Chinese) |
中文摘要 | 對乳癌患者的相切照野放射治療技術中,以虛擬式楔型濾器代替一般傳統治療使用的實體式楔型濾器,評估兩種不同形式的楔型濾器對皮膚劑量及重要組織器官的影響,並探討楔型濾器在臨床放射治療的應用。在直線加速器Siemens PRIMUS下使用6 MV的光子能量,照射擬人假體(Rando phantom)的右側乳房,以熱發光劑量計(thermoluminescent dosimeter, TLD)做為皮膚劑量的量測工具,分別在右側乳房體表上、左右側的乳頭及兩眼眼球表面上佈點做吸收劑量的量測。測量結果顯示使用虛擬式楔形濾器照射時的皮膚劑量大於使用實體式楔形濾器,但在對側乳頭及左、右眼球部位,實體式楔形濾器下的皮膚劑量則大於虛擬式楔型濾器。而隨著實體式楔型濾器角度的增加,皮膚接受到的劑量反而減少,虛擬式楔型濾器也有此現象。當乳癌患者需要較多的皮膚劑量來治療擴展到皮膚的癌細胞時,可以利用虛擬式楔形濾器會引起較高皮膚劑量的特性來做治療,而且照野外的皮膚劑量少於實體式楔形濾器。虛擬式楔形濾器可以省去人工抽換的時間,此外,在相同的照射劑量下,虛擬式楔型濾器所需的機器MU輸出量比實體式楔型濾器來的小,並有15°至60°連續的角度可供選擇,故虛擬式揳形濾器在臨床放射治療應用上擁有其便利及優點。 |
英文摘要 | In this paper, we use virtual wedge replace physical wedge that used in conventional radiation therapy for the breast cancer patient treated with tangential radiation therapy. The purpose is to compare the surface doses and doses of critical organs between physical wedge and virtual wedge techniques. We also discuss the clinical application of virtual wedge in radiation therapy. Measurements are performed for 6 MV photon beam from the linear accelerator, Siemens PRIMUS. The right side breast of Rando phantom is exposed. The doses of breast are measured by thermoluminescent dosimeter (TLD). These TLD chips are placed at the surface of right breast, the nipples of right and left side, and the surface of two eyeballs. Surface doses of the breast are higher for virtual wedge than physical wedge. However, physical wedge generates more surface doses than virtual wedge in the opposite nipple, left and right eyeball. For physical wedge, the surface doses will decrease as the wedge angle increases. The virtual wedge has the same performances, too. We can use virtual wedge technique to treat breast cancer patient whose tumor extend to skin and need more surface doses. We can use virtual wedge technique to treat breast cancer patient whose tumor extend to skin and need more surface doses. Surface doses of non-irradiation area are less for virtual wedge than physical wedge. Virtual wedge technique can save time of technicians to put the physical Wedge on the head of LINAC. Besides, virtual wedge technique needs less monitor unit (MU) than physical wedge under the same exposure dose. For virtual wedge technique, we have wedge angles from 15° to 60° to use. That is more flexible than physical wedge. Virtual wedge technique really has its advantages in the clinical radiation therapy. |
本系統中英文摘要資訊取自各篇刊載內容。