Bly S H, Hussey R G, Kingsley J P, Dickson A W
Bureau of Radiation and Medical Devices, Health and Welfare Canada, Tunney's Pasture, Ottawa, Ontario.
Health Phys. 1989 Oct;57(4):637-43. doi: 10.1097/00004032-198910000-00017.
Clinical efficacy and safety may be compromised if output from ultrasonic therapy transducers differs significantly from the indicated value. Space-averaged effective intensities selected for treatment are a ratio of the emitted ultrasonic power to the effective radiating area (ERA). In this study, ERA measurements for 17 commercially available devices were obtained by using a hydrophone scanning technique, and sources of systematic error were assessed by computer simulation. Marginal differences in technique may lead to differences of up to 50% in measured values. Suggestions are made for the improvement of consistency in such measurements.
如果超声治疗换能器的输出与规定值有显著差异，临床疗效和安全性可能会受到影响。选定用于治疗的空间平均有效强度是发射的超声功率与有效辐射面积（ERA）的比值。在本研究中，通过水听器扫描技术获得了17种市售设备的ERA测量值，并通过计算机模拟评估了系统误差来源。技术上的微小差异可能导致测量值相差高达50%。针对提高此类测量的一致性提出了建议。
