Center for Proton Therapy, Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen, Switzerland.
Department of Physics, ETH Zurich, 8092, Zurich, Switzerland.
Radiat Oncol. 2021 May 12;16(1):87. doi: 10.1186/s13014-021-01804-7.
The Polaris product line from Northern Digital Inc. is well known for accurate optical tracking measurements in research and medical environments. The Spectra position sensor, to date often found in image guided radiotherapy suites, has however reached its end-of-life, being replaced by the new Vega model. The performance in static and dynamic measurements of this new device has been assessed in controlled laboratory conditions, against the strict requirements for system integration in radiation therapy. The system accuracy has improved with respect to the Spectra in both static (0.045 mm RMSE) and dynamic (0.09 mm IQR, < 20 cm/s) tracking and brings marginal improvement in the measurement latency (14.2 ± 1.8 ms). The system performance was further confirmed under clinical settings with the report of early results from periodic QA tests within specifications. Based on our tests, the Polaris Vega meets the quality standards of radiotherapy applications and can be safely used for monitoring respiratory breathing motion or verifying patient positioning.
北极星产品线来自 Northern Digital Inc.，以在研究和医疗环境中进行精确的光学跟踪测量而闻名。迄今为止，通常在图像引导放射治疗套件中发现的光谱位置传感器已达到其使用寿命终点，现已被新型 Vega 型号取代。该新型设备在静态和动态测量方面的性能已在受控实验室条件下进行了评估，以满足放射治疗中系统集成的严格要求。与 Spectra 相比，该系统在静态（0.045 毫米 RMSE）和动态（0.09 毫米 IQR，<20 厘米/秒）跟踪方面的精度都有所提高，并且在测量延迟（14.2 ± 1.8 毫秒）方面也略有提高。在临床环境下，通过报告符合规格的定期 QA 测试中的早期结果，进一步证实了系统性能。根据我们的测试，北极星 Vega 符合放射治疗应用的质量标准，可安全用于监测呼吸运动或验证患者定位。
