| 赵瑞,王震岳,李莎,陆军,朱向辉,高行新.射波刀影像追踪中X射线曝光条件对脊柱追踪错误节点及辐射剂量的影响[J].中华放射医学与防护杂志,2014,34(2):133-135 |
| 射波刀影像追踪中X射线曝光条件对脊柱追踪错误节点及辐射剂量的影响 |
| Effect of X-ray exposure parameters on the false-node rate and radiation dose in CyberKnife spine tracking |
| 投稿时间：2013-07-04 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.02.014 |
| 中文关键词: 射波刀 影像引导 脊柱追踪 辐射剂量 |
| 英文关键词:CyberKnife Image-guidance Spine tracking Radiation dose |
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| 中文摘要: |
| 目的 研究和探讨射波刀脊柱追踪影像引导放疗中X射线曝光条件与错误节点比率的关系。方法 利用脊柱追踪放疗计划，采用不同X射线曝光条件对体模进行影像引导定位，观察脊柱追踪错误节点比率及体模表面吸收剂量的变化规律，确定X射线曝光条件与脊柱追踪错误节点比率之间是否存在优化曝光剂量。结果 脊柱追踪错误节点比率随着X射线曝光条件增加而降低，初期明显，但随着曝光条件的增加到一定水平，脊柱追踪错误节点比率不再降低；体模表面吸收剂量随着X射线曝光条件增加而增加；在≤5%的错误节点标准范围内，当平均错误节点为2.77%、1.07%、1.0%时，体模表面吸收剂量分别为0.11、0.26、0.31~0.46 mGy，相差1~3倍。结论 在射波刀影像引导放疗中，X射线曝光条件与脊柱追踪错误节点之间存在优化曝光剂量，使用最优X射线影像曝光剂量可大幅降低患者辐射剂量，对放疗患者的辐射防护具有非常重要的意义。 |
| 英文摘要: |
| Objective To explore the relationship of X-ray exposure parameters and false-node rate during image-guidance treatment with CyberKnife spine tracking. Methods Using spine tracking planning on a chest phantom, several combinations of X-ray exposure parameters were used to locate. The false-node ratio and the surface absorbed dose were investigated and the radiation dose was optimized. Results The false-node ratio and surface absorbed radiation dose decreased when the X-ray exposure parameters increased until they saturated. In the range of ≤5.0% false-node rate, the surface absorbed radiation dose was 0.11, 0.26 mGy, and 0.31-0.46 mGy, when the false-node rate was 2.77%,1.07% and 1.0%, respectively. Conclusions In image-guided treatment of CyberKnife, the radiation dose would be optimized,and the patient's radiation dose would be reduced greatly, which is important to protect the patients. |
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