Xu Y, Wang L V
Optical Imaging Laboratory, Texas A&M University, College Station 77843-3120, USA.
Med Phys. 2001 Jul;28(7):1519-24. doi: 10.1118/1.1380436.
Microwave-induced thermoacoustic tomography was explored to image biological tissues. Short microwave pulses irradiated tissues to generate acoustic waves by thermoelastic expansion. The microwave-induced thermoacoustic waves were detected with a focused ultrasonic transducer to obtain two-dimensional tomographic images of biological tissues. The dependence of the axial and the lateral resolutions on the spectra of the signals was studied. A reshaping filter was applied to the temporal piezoelectric signals from the transducer to increase the weight of the high-frequency components, which improved the lateral resolution, and to broaden the spectrum of the signal, which enhanced the axial resolution. A numerical simulation validated our signal-processing approach.
对微波诱导热声层析成像技术用于生物组织成像进行了研究。短微波脉冲照射组织，通过热弹性膨胀产生声波。用聚焦超声换能器检测微波诱导的热声波，以获取生物组织的二维断层图像。研究了轴向分辨率和横向分辨率对信号频谱的依赖性。对来自换能器的时间压电信号应用了一种整形滤波器，以增加高频成分的权重，从而提高横向分辨率，并拓宽信号频谱，进而提高轴向分辨率。数值模拟验证了我们的信号处理方法。
