| 华宏雨,刘海宽,吴锦海,顾乃谷.移动式术中放疗电子加速器手术室剂量场与防护实验研究[J].中华放射医学与防护杂志,2012,32(6):652-655 |
| 移动式术中放疗电子加速器手术室剂量场与防护实验研究 |
| Experimental research of dose distribution and protection for mobile intra-operative radiotherapy accelerator in operating room |
| 投稿时间：2012-05-22 |
| DOI：10.3760/cma.j.issn.0254-5098.2012.06.027 |
| 中文关键词: 术中放射治疗 Mobetron加速器 剂量分布 |
| 英文关键词:Intraoperative radiotherapy Mobetron accelerator Dose distribution |
| 基金项目: |
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| 摘要点击次数: 3428 |
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| 中文摘要: |
| 目的 研究移动式术中放疗电子加速器(Mobetron)在手术室中的剂量分布特征,为制定相应防护措施与标准提供基础数据。方法 对于常用的电子束能量9 MeV,在50、100、150和200 cm 4个高度平面,每个平面在每隔45°的8个方位上,距中心轴每隔50 cm处分别布放热释光剂量计。选择高度为100 cm的平面,对电子束能量为4、6、9、12 MeV的4个能量档位,进行对比测量。在10 Gy/min条件下出束10 Gy后测读热释光剂量计。结果 9 MeV时,在高度为100 cm的平面上,距中心参考点50、100、150和200 cm 处的剂量当量平均值分别为169、756、395和241 μSv;在距中心参考点50 cm不同角度上的剂量与平均值最大相差9.1%。9 MeV时50、100、150和200 cm 4个高度平面各方向距中心轴100 cm处,平均剂量分别为527、756、570和141 μSv。而4、6、9和12 MeV在100 cm高度平面90°上,距中心轴100 cm处的剂量分别为573、486、689和781 μSv。结论 同一能量时,同一平面各角度上剂量都随距离增大呈幂指数衰减;同一高度平面,不同角度的剂量分布基本一致。不同高度平面上,100 cm平面的剂量最大。在不同能量档,剂量随能量的升高而增大。 |
| 英文摘要: |
| Objective To study the dose distribution characteristics formobile intra-operative radiotherapy accelerator (Mobetron) in an operating room, and to provide basic data for developing appropriate radiation protection measures and protection standard. Methods For most commonly used electron energy 9 MeV, TLD dosimeters were placed at 50, 100, 150 and 200 cm high plane, respectively. For each plane, the measurement points were selected at every 50 cm from the central axis at every 45° at eight different directions. Also different electron energies, such as 4, 6, 9 and 12 MeV, were taken into consideration at the plane at 100 cm height. After 10 Gy with a dose rate of 10 Gy/min were delivered, the TLD dosimeters were used to read out the data. Results For 9 MeV, at the phantom plane(100 cm high plane), the average doses were 169, 756, 395 and 241 μSv at 50, 100, 150 and 200 cm from the central axis, respectively. Themaximum deviation between the doses at 50 cm from the central axis in different angles and their average values were 9.1%. In the identical angle, the average doses of 50,100, 150 and 200 cm high planes at the distance of 100 cm from central axis were 527, 756, 570 and 141 μSv, respecitvely. For the energies of 4, 6, 9 and 12 MeV, the average doses were 573, 486, 689 and 781 μSv at 100 cm from the central axis at 90° of 100 cm high plane. Conclusions For the same energy, the dose values at different directions were decreased by the minus exponential function law with the distance. The doses were uniformly distributed at different directions at the same distance from the central axis. The doses on the plane of 100 cm height were much higher than those at other heights, and the dose values were increased with the election energy. |
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