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验证SRS MapCHECK对CyberKnife患者特定质量保证的验证:面对小圆尺寸的挑战

Dohyeon Yoo¹, Taeho Kim¹, Hojae Kim¹

¹Department of Radiation Oncology, Yonsei Cancer Center, Heavy Ion Therapy Research Institute, Yonsei University College of Medicine, Seoul, Republic of Korea.

Frontiers in oncology

|January 26, 2026

概括

SRS MapCHECK对于具有较大的场域的CyberKnife患者特定QA有效,但对小场域 (≤12.5毫米) 显示显著的低测量误差. 对于小领域,准确的剂量测量需要仔细考虑其局限性.

科学领域:

医学物理医学物理
辐射瘤学辐射瘤学

背景情况:

该CyberKnife系统用于立体射线手术 (SRS) 和立体体射线疗法 (SBRT).
SRS MapCHECK是放射治疗中患者特定质量保证 (PSQA) 的一个工具.

研究的目的:

为了评估SRS MapCHECK在CyberKnife PSQA中的性能.
为了确定PSQA对小辐射场的分析中的不准确性.
推使用SRS MapCHECK与CyberKnife一起使用的最佳实践.

主要方法:

在12个CyberKnife患者计划中使用SRS MapCHECK进行了PSQA.
应用了场面大小和门架角度的校正因子.
静态剂量递送被测试在不同的机器人手臂角度和形大小.
评估了校正因子对剂量计准确度的影响.

主要成果:

在形大小和绝对剂量测量误差 (ρ = -0.87,p < 0.0001) 之间观察到显著的负相关性.
小型固定 (≤12.5毫米) 的低测量比大型 (≥15毫米) 显著更大.
在SRS MapCHECK的校正因子显示,对于≤12.5mm的圆的有效性有限.

结论:

SRS MapCHECK适用于具有较大的固定圆尺寸的CyberKnife PSQA.
对于使用非常小的固定圆 (≤12.5毫米) 的图案,SRS MapCHECK 不能确保剂量计准确性.
对于可靠的CyberKnife PSQA,必须解决SRS MapCHECK对小领域的局限性.

关键词:

网络刀网络刀在SRS MapCHECK中检查地图.视角纠正的角度纠正患者特定的质量保证.小场剂量测量小场剂量测量立体的放射外科手术.

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