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題名 | 楊桃細菌性斑點病之病因探討及防治成果 |
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作者 | 蔡志濃; 安寶貞; 許秀惠; 林俊義; | 書刊名 | 技術服務 |
卷期 | 10:1=37 1999.03[民88.03] |
頁次 | 頁7-8 |
分類號 | 435.36 |
關鍵詞 | 楊桃; 細菌性斑點病; |
語文 | 中文(Chinese) |
中文摘要 | 放射治療近十幾年來蓬勃發展,對於治療精確度要求也越來越高,因此所使用治療之輔助物就更加重視。例如阻擋物之應用在放射治療,亦是一個重要之觀念,諸如重要器官之阻擋及相鄰照野中重疊部分之阻擋等。而一理想的阻擋物必需吻合射線之斜率,但有時基於某些因素而採用手擺無斜率之阻擋物,因此本篇即針對阻擋物的幾何問題-斜率對照野之影響來做一深入探討,並尋求一誤差最小且能通用於各大小之照野的有斜率阻擋物。 本實驗利用Siemens KDS及Varian 2100C之機器選擇四種大小之照野(10 × 10、15 × 15、20 × 20、30 × 30cm�插^,首先在模擬攝影時SSD(Source-Skin Distance)100 cm之X光片於四個照野中右上角阻擋4 × 4cm�握j小,然後升至四種SSD(94、92、90、88cm),在各照野中畫出阻擋物大小,再以手擺無斜率之鉛塊分別於SSD94、92、90、88 cm阻擋,最後阻擋物不動,再降至100 cm處,比較各照野在不同SSD時阻擋物投射之差。以同樣方式我們製作一塊4 × 4 cm�揭b照野為20 × 20 cm�揹犰陰袉v的通用阻擋物,然後在不同照野下用此通用阻擋物去和不同照野但無斜率的阻擋物的結果作比較,以便比較有斜率的通用阻擋物和手擺無斜率的阻擋物之優缺點。 從實驗中我們可得到些結果:當照野愈大時使用無斜率的阻擋物誤差愈大;深度愈深誤差也愈大;以20 × 20 cm�握丹陰袉v的阻擋物可通用於各照野,且誤差較小。 從結果我們可知,如果要使治療更為精確,惟有灌製正確斜率的阻擋物,否則需考慮會出現以上之誤差,因此使用通用有斜率的阻擋物,以使誤差降至最小。 |
英文摘要 | New innovations and technical advances has been markedly developed in the field of radiation therapy during the past two decades. Precision of treatment accessories is vital in routine practice to achieve accuracy of dose delivery. Shielding blocks are one of the devices used extensively. An ideal lead block should have edges that match with the divergent characteristic of radiation beam. However, sometimes blocks with a straight-sided edge are used in most of the department. This study is to compare the geometrical accuracy of alignment in different field size and divergent of block edge. In this investigation, field sizes of 10 × 10, 15 × 15, 20 × 20 and 30 × 30 cm�� were driven on Siemens KDS and Varian 2100C. Initially, simulation films with these field sizes were taken at SSD (source-skin distance) 100cm and a 4 × 4 cm�� shielding block was drawn to block the right upper corner of each field. Then, block size were drawn at four different SSDs (94,92,90,88 cm). To verify if a straight-sided edge shielding block matches exactly with the field drawn under a divergent condition, we place a straight-cut edge block at each of the four SSDs, and then set the couch to SSD 100cm. With the same procedures, we placed a 4 × 4 cm�� block with slant edge to block the right upper corner of a 20 × 20 cm�� field. From our experiment, we found the 1) the deviation increases with the field size when using a straightside block instead of a slant-sided block; 2) the deviation increases with depth; 3) slant-sided block fabricated with a 20 × 20 cm�� was universal for all different field sizes. This study suggests that the treatment can be delivered more accurately when a shielding block with a slant-sided block is used. |
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