| 徐义果,徐志勇,陈俊超,等.陀螺旋转式60Co伽玛刀的性能测试[J].中华放射医学与防护杂志,2012,32(3):308-310.XU Yi-guo,XU Zhi-yong,CHEN Jun-chao,et al.Commissioning of a GyroKnife digital 60Co system[J].Chin J Radiol Med Prot,2012,32(3):308-310 |
| 陀螺旋转式60Co伽玛刀的性能测试 |
| Commissioning of a GyroKnife digital 60Co system |
| 投稿时间：2011-10-13 |
| DOI：10.3760/cma.j.issn.0254-5098.2012.03.022 |
| 中文关键词: 伽玛刀 陀螺刀 质量保证 |
| 英文关键词:Gamma knife GyroKnife Quality assurance |
| 基金项目: |
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| 中文摘要: |
| 目的 评价陀螺旋转式60Coγ刀的性能特性。方法 用辐射剂量仪测量防护要求各点的剂量率。用千分尺测量治疗床在三维方向的运动精度,用量角器测量机架的旋转运动范围。用Φ160 mm有机玻璃球模和胶片测量辐射半高宽和半影宽度,并测量各准直器等中心与辐射野中心的偏差。结果 防护安全性满足临床要求,床的运动精度最大误差在z轴方向为0.2 cm,机架角运动精度最大误差为0.1°。4个准直器辐射半高宽分别为2.55、5.40、10.50和18.55 mm,平均半影宽分别为5.0、12.4、30.1和51.5 mm。辐射等中心与机械等中心偏差最大为1.41 mm。结论 陀螺型γ刀具有良好的机械特性,适合用于临床上的立体定向放疗。 |
| 英文摘要: |
| Objective To introduce and evaluate the characteristics of a GyroKnife Digital Cobalt-60 System for stereotactic radiotherapy and radiosurgery in mechanical aspect.Methods To test the radiation safety, the dose rate required for radiation protection was measured by using an ionization survey meter (Inovision Model 451B, Cleveland, OH). Micrometer was used to verify the accuracy of the table in movement and protractor to verify the rotation movement range. The 160 mm diameter polystyrene spherical phantom and film were used in measurement of the radiation Full Width at Half Maximum. And the difference between radiation isocenter and mechanical isocenter was also verified.Results Clinical requirement in radiation protection was met. The maximum error of table movement accuracy was 0.2 cm at Z axis; the maximum error of gantry movement accuracy was 0.1°. For all the collimators, radiation Full Width at Half Maximum (FWHM) was 2.55,5.40,10.50,and 18.55 mm and average penumbra was 5.0,12.4,30.1,and 51.5 mm, respectively. The maximum difference between mechanical center and radiation center was 1.41 mm.Conclusions Stereotactic radiotherapy and radiosurgery has good mechanical characteristics and is suitable clinic applications. |
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