Hornsleth S N, Frydendal L, Mella O, Dahl O, Raskmark P
Department of Radiophysics, Haukeland Hospital, Bergen, Norway.
Int J Hyperthermia. 1997 Mar-Apr;13(2):169-85. doi: 10.3109/02656739709012381.
Today most treatments with regional hyperthermia are applied using radiofrequency systems with 'focus' steering by amplitude and phase control. This paper deals with quality assurance procedures developed to ensure controlled and safe treatments in such systems. Our results show how the deviations between requested and observed phase and amplitude vary with frequency, and how these deviations depend on both the geometry of the object (phantom) inside the system and the power level applied. The results also indicate that the investigated systems' internal quality assurance procedures were inadequate and that additional procedures should be applied. Since the system parameters depend on patient and treatment specific conditions it is concluded that there is a need for QA measurements before or during treatment. This paper deals specifically with the commercial BSD-2000 system from BSD Medical Corp. in Salt Lake City, Utah, as installed in Bergen, but the procedure outlined can be applied to other phase and amplitude-controlled RF-RHT systems with only minimal adjustments.
如今，大多数区域热疗治疗是通过具有幅度和相位控制的“聚焦”转向的射频系统进行的。本文论述了为确保此类系统中治疗的可控性和安全性而制定的质量保证程序。我们的结果表明，所要求的与观察到的相位和幅度之间的偏差如何随频率变化，以及这些偏差如何既取决于系统内部物体（体模）的几何形状又取决于所施加的功率水平。结果还表明，所研究系统的内部质量保证程序并不充分，应采用额外的程序。由于系统参数取决于患者和治疗的特定条件，因此得出结论，在治疗前或治疗期间需要进行质量保证测量。本文专门论述了安装在卑尔根的、来自犹他州盐湖城BSD医疗公司的商用BSD - 2000系统，但所概述的程序只需进行最小调整即可应用于其他具有幅度和相位控制的射频区域热疗系统。
