Hawley M S, Conway J, Anderson A P, Cudd P A
Department of Medical Physics and Clinical Engineering, Weston Park Hospital, Sheffield, U.K.
Int J Hyperthermia. 1988 Jul-Aug;4(4):427-35. doi: 10.3109/02656738809016495.
Non-invasive thermal imaging and temperature measurement by microwave radiometry has been investigated for medical diagnostic applications and monitoring hyperthermia treatment of cancer, in the context of heterogeneous body structure. The temperature measured by a radiometer is a function of the emission and propagation of microwaves in tissue and the receiving characteristics of the radiometric probe. Propagation of microwaves in lossy media was analysed by a spectral diffraction approach. Extension of this technique via a cascade transmission line model provides an efficient algorithm for predicting the field patterns of aperture antennas contacting multi-layered tissue. A coherent radiative transfer analysis was used to relate the field pattern of a radiating antenna to its receiving characteristics when used as a radiometer probe, leading to a method for simulating radiometric data. Measurements and simulations were used to assess the effect of overlying fat layers upon radiometer response to temperature hot spots in muscle-type media. Results suggest that dielectric layering in tissue greatly influences measured temperatures and should be accounted for in the interpretation of radiometric data.
在非均匀人体结构的背景下，已经对用于医学诊断应用和监测癌症热疗的非侵入式热成像和通过微波辐射测量进行温度测量进行了研究。辐射计测量的温度是微波在组织中的发射和传播以及辐射测量探头接收特性的函数。通过光谱衍射方法分析了微波在有损介质中的传播。通过级联传输线模型对该技术的扩展提供了一种预测与多层组织接触的孔径天线场模式的有效算法。当用作辐射计探头时，使用相干辐射传输分析将辐射天线的场模式与其接收特性相关联，从而产生一种模拟辐射测量数据的方法。测量和模拟用于评估覆盖脂肪层对辐射计对肌肉型介质中温度热点响应的影响。结果表明，组织中的介电分层对测量温度有很大影响，在解释辐射测量数据时应予以考虑。
