Image reconstruction method for photoacoustic imaging accounting for impulse responses and directivity of ultrasonic detector
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摘要:
在光声成像中, 假设超声探测器为具有全向响应的理想点探测器通常会导致图像分辨率下降。为了解决探测器效应引起的图像质量下降问题, 提出一种考虑探测器特性的光声图像重建方法, 建立包含探测器方向性和脉冲响应的前向成像模型, 通过迭代求解前向模型的逆问题, 实现光吸收能量分布图的高质量重建。仿真和仿体实验结果表明, 与未考虑或未充分考虑探测器特性的传统重建方法和其他重建增强方法相比, 所提方法可以显著提高图像分辨率和对比度, 改善图像质量。
Abstract:In photoacoustic imaging, image reconstruction suffers from the assumption of an ideal point detector with omnidirectional response, resulting in a degradation in the resolution of the reconstructed image. An image reconstruction method that takes into account the impulse responses and directionality of the ultrasonic detector is proposed in this paper. A high-quality image representing the optical absorption distribution is reconstructed by iteratively solving the inverse problem of the forward model incorporating the detector directivity and impulse response. Results of simulation and phantom experiments show that the proposed method can significantly improve image resolution and contrast compared with traditional reconstruction methods and other reconstruction enhancement methods that do not or not fully account for detector characteristics.
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表 1 仿真模型的组织特性参数
组织名称 平均折射率 吸收系数 (cm‒1) 散射系数 (cm‒1) 各向异性因子 平均声速 (m/s) 平均密度 (kg/L) 点阵 1.40 0.99 450 0.80 1635 1.30 血管壁 外膜 1.39 0.70 5 1600 1.02 中膜 0.40 1580 1.07 内膜 0.20 1560 1.07 钙化斑块 1.42 0.60 550 1650 0.94 脂质斑块 0.90 500 1500 0.96 巨噬细胞 0.96 450 1620 0.97 坏死核 0.80 450 1620 0.97 混合斑块 0.60 550 1650 0.94 管腔 1.32 1.00 600 0.99 1540 1.13 
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