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提出用固定孔径的换能器虚拟阵列探测器进行数据采集,该换能器只需对样品进行180°扫描。实验中,使用调QNd:YAG激光器作为光源,激光器输出激光波长为532nm,重复频率为10Hz,脉宽为7ns;使用非聚焦换能器进行光声信号探测,其接收面直径为6mm,中心频率为2.25MHz,接收到光声信号用逆拉东变换进行图像重建。以小白鼠的离体爪子作为成像对象,换能器由旋转电机控制并以2°作为旋转步长进行180°旋转扫描获取实验数据,运用逆拉东变换进行了图像重建。所重建的图像比较清晰地反映了爪子内部的骨骼分布。由此表明,逆拉东变换可以用于光声成像,并且实现了有限角度的光声成像。
A fixed-aperture transducer virtual array detector is proposed for data acquisition, which requires only a 180 ° scan of the sample. In the experiment, QNd: YAG laser was used as the light source. The laser output laser wavelength was 532nm, the repetition frequency was 10Hz and the pulse width was 7ns. The photoacoustic signal was detected by non-focusing transducer. The receiving surface diameter was 6mm, the center frequency For 2.25MHz, received the photoacoustic signal with the inverse pull East transformation for image reconstruction. The isolated paws of mice were used as the imaging objects. The transducer was controlled by a rotating motor and rotated 180 ° with 2 ° rotation steps to obtain the experimental data. The images were reconstructed by the inverse Radon transform. The reconstructed images more clearly reflect the skeletal distribution inside the paw. Thus, it is shown that the inverse pull-to-east transform can be used for photoacoustic imaging, and the photoacoustic imaging with limited angle is realized.