Signal processing in scanning thermoacoustic tomography in biological tissues.

Signal processing in scanning thermoacoustic tomography in biological tissues.
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生物组织中扫描热声断层扫描的信号处理。

DOI:
10.1118/1.1380436
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发表时间:
2001
期刊:
影响因子:
3.8
通讯作者:
Wang,LV
Wang,LV
中科院分区:
医学3区
文献类型:
--
作者:
Xu,Y;Wang,LV

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探索微波诱导热声断层扫描以成像生物组织。微波短脉冲辐照生物组织,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,以获得生物组织的二维断层图像。研究了轴向和横向分辨率对信号频谱的依赖关系。将整形滤波器应用于来自换能器的时域压电信号,以增加高频分量的权重,从而提高横向分辨率,并加宽信号的频谱,从而提高轴向分辨率。数值模拟验证了我们的信号处理方法。
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.
DOI: 10.1118/1.598688
发表时间: 1999-09-01
期刊: MEDICAL PHYSICS
影响因子: 3.8
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期刊: MEDICAL PHYSICS
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