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題名 | 遠隔放射線治療之表面劑量測定 |
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作者姓名(中文) | 廖明雄; 陳合興; 李玉麟; | 書刊名 | 慈濟醫學 |
卷期 | 7:1 1995.03[民84.03] |
頁次 | 頁47-50 |
分類號 | 418.94 |
關鍵詞 | 表面劑量; 假體; 游離腔; 照野; Surface dose; Phantom; Ion chamber; Field size; |
語文 | 中文(Chinese) |
中文摘要 | 本研究之目的主要在測量不同機種及能量放射治療之表面劑量百分 比。包括三家醫院共四檯鈷六十及乙檯10MV直線加速器。所使用的測量儀器為 Capintec薄窗型游離腔並配合適當的聚苯乙烯(polystyrene)材質假體。測量時射源 至假體表面距離(SSD)保持80cm或65cm,照野由5X5cm�揭�25x25cm�揖B同一能量 參考深度均相同。由測量結果得知.對鈷六十而言,SSD 80cm時其表面劑量由 5X5cm�揪�20,至25x25cm�揪�59。SSD為65cm則其表面劑量較SSD 80cm者高,且 其數值隨照野之增大而增加。10MV直線加速器之表面劑量由5X5cm�揪�9至 25x25cm�揪�21。(慈濟器學 1995;7:47-50) |
英文摘要 | This is a study about surface dose on different teletherapy units. We measured the surface dose of four Co60 and one linear accelerator machine in three hospitals. The instrument we used included capintec thin windowtype ion chamber and solid phantom of polystyrene. In this experiment we set the source to surface distanc at80 cm and 65 cm, field size from 5x5 to 25x25 cm square and set ion chamber at the same energy. Judgingfrom this experiment, we obtained some results. The surface dose of Co-60 increase from 20 to 59 whenfield size increase from 5x5 cm square to 25x25 cm square. Besides, there was little difference for differentmachines. Similary. the surface dose increased from 9 to 21 for linear accelarator. In addition, the surfacedose set at SSD 65 cm was higher than that at SSD 80 cm. When the distance of source to surface wasshortened, collimator closed to surface of phantom. Low energy scatter radiation and electron contaminationwhich came from collimator made the surface dose increase. Surface dose decreased when energy increased, solow energy radiation is suitable to treat skin cancer. On the contrary, high energy radiation would reduce thesurface dose. (Tzu Chi Med J 1995; 7: 47-50) |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。