Wust P, Nadobny J, Fähling H, Riess H, Koch K, John W, Felix R
Klinikum Rudolf Virchow der Freien Universität Berlin, Abteilung Radiologie mit Poliklinik.
Strahlenther Onkol. 1991 Mar;167(3):172-80.
Clinical observables and phantom measurements (part 1) have suggested that the control of power deposition patterns can still be improved for the hyperthermia system BSD-2000. This is addressed to system-specific phase errors as well as inadequacies of phase selection (target point method), which might be corrected by modifications of the manufacturer. Furthermore, frequency-dependent physical effects (coupling, mode excitation) are existing, which might cause distortions and asymmetries of current distribution on antennas and consequently deteriorate the power deposition pattern (e.g. focussing capability). The application of a network analyzer system is described in order to determine electrical material constants, phase errors, coupling coefficients, reflection coefficients and current distributions on antennas. The analysis of the measurement datas suggests that ring-applicator has a variable frequency-optimum (supposed around 80 ... 95 MHz) characterized by minimal coupling and asymmetries.
临床观察结果和体模测量（第1部分）表明，对于BSD - 2000热疗系统，功率沉积模式的控制仍有改进空间。这与系统特定的相位误差以及相位选择（靶点法）的不足有关，制造商可能会通过修改来纠正这些问题。此外，存在频率相关的物理效应（耦合、模式激发），这可能会导致天线上电流分布的畸变和不对称，进而使功率沉积模式恶化（例如聚焦能力）。本文描述了应用网络分析仪系统来确定电介质常数、相位误差、耦合系数、反射系数以及天线上的电流分布。对测量数据的分析表明，环形 applicator具有可变的频率最优值（推测在80……95MHz左右），其特点是耦合和不对称最小。 （注：原文中“ring-applicator”未明确具体中文名称，暂保留英文）
