Delay-and-sum beamforming (DSB) of photoacoustic data does not incorporate a priori spatial sparsity of the imaging target. By incorporating this information into beamforming for limited-view photoacoustic computed tomography, we experimentally obtained enhanced resolution images of wires at a depth of 8.5 mm in a tissue mimicking scattering medium. Using a 21 MHz transducer, we improved the resolution from the 200 to 250 μm achieved by DSB to 75 μm. The sparsity-based technique also generated a cleaner image with a background signal level of roughly $-50\mathrm{dB}$, much lower than the roughly $-18\mathrm{dB}$ background signal level of DSB.

中文翻译：

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基于稀疏性的散射介质深处超分辨有限视图光声计算机断层扫描的重建

光声数据的延迟和求和波束形成（DSB）不包含成像目标的先验空间稀疏性。通过将此信息合并到用于有限视图光声计算机断层扫描的波束成形中，我们在模仿散射介质的组织中实验获得了深度为8.5 mm的导线的增强分辨率图像。使用21 MHz的换能器，我们将分辨率从DSB的200微米提高到了250微米，提高到了75微米。基于稀疏性的技术还生成了背景信号电平大约为2的清晰图像。$-50\mathrm{D\; b}$，远低于大致 $-\mathrm{18岁}\mathrm{D\; b}$ DSB的背景信号电平。