为了研究探测器频带对光声成像分辨率的影响,采用有限元仿真实验,得出不同探测器频带与分辨率之间的经验公式,即对于mm量级的吸收体,探测器的截止频率大于2 MHz时,重建图像分辨率变化不明显,当探测器的截止频率小于2 MHz时,分辨率降低非常明显.该研究结果对光声成像探测器的选择、成像效果评估具有参考价值.%In order to research the influence of different bandwidths of transducer on photo-acoustic imaging resolution, finite element simulation experiments were carried out. An empirical formula was obtained between transducer bandwidth and photo-acoustic imaging resolution. Experimental results showed that the reconstructed image resolution of absorbers was unchanged in the order of millimeters when the cut-off frequency of transducer was greater than 2 MHz; however, it was contrary for the frequency less than 2 MHz. The results are helpful for the choice of transducer and the evaluation of image reconstruction.
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