Fig. 1. Flow chart of the proposed method.方法流程图

Fig. 2. Principle of synthetic aperture ultrasound: (a) Synthetic aperture focusing technique; (b) synthetic transmit aperture.合成孔径超声原理　(a)合成孔径聚焦; (b)发射合成孔径

Fig. 3. PSM model: (a) Single layer model; (b) multi-layer model.PSM模型　(a)单层介质模型; (b)多层介质模型

Fig. 4. Experiment setup.实验装置示意图

Fig. 5. Simulated results: (a) The first 30 bases of compressed sensing; (b) received signal of single element; (c) received signals of all elements; (d) compressed sensing based temporally adjusted received signals of all elements.仿真结果　(a)压缩感知前30个基底; (b)单通道接收信号; (c)单次发射全部通道接收信号; (d)压缩感知调整的单次发射全部通道接收信号

Fig. 6. Simulated reconstructed results: (a) Simulated reconstructed result without velocity model; (b) simulated reconstructed result with velocity model.仿真重建结果　(a)未建立声速模型的仿真重建结果; (b)建立声速模型的仿真重建结果

Fig. 7. Experiment results: (a) The first 30 bases of compressed sensing; (b) received signal of single element; (c) received signals of all elements; (d) compressed sensing based temporally adjusted received signals of all elements.实验结果　(a)压缩感知前30个基底; (b)单通道接收信号; (c)单次发射全部通道接收信号; (d)压缩感知调整的单次发射全部通道接收信号

Fig. 8. Experiment reconstructed results: (a) Experiment reconstructed result without velocity model; (b) experiment reconstructed result with velocity model.实验重建结果　(a)未建立声速模型的实验重建结果; (b)建立声速模型的实验重建结果

Fig. 9. Comparison of compressed sensing and Hilbert transform: (a) Origin signal and noisy signal; (b) result of compressed sensing; (c) result of Hilbert transform.压缩感知与Hilbert变换比较　(a)原始信号及带噪信号; (b)针对原始信号和带噪信号的压缩感知结果; (c)针对原始信号和带噪信号的Hilbert变换结果