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Full-field 3D photoacoustic imaging based on plane transducer array and spatial phase-controlled algorithm.

机译：基于平面换能器阵列和空间相位控制算法的全场3D光声成像。

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PURPOSE: Photoacoustic imaging (PAI) used for noninvasive imaging of biological tissue has been reported in many literature. However, there are still some disadvantages in the novel technique, such as the poor efficiency of imaging. In the current PAI, multiple excitation of laser and multiple acquisition of signal are necessary for image reconstruction. In this case, laser pulses may injure biological tissue due to energy accumulation. To popularize PAI in clinical applications, it is necessary to develop a new imaging approach to increase the efficiency of PAI. METHODS: A spatial phase-controlled algorithm is presented for full-field three-dimensional (3D) image reconstruction. By using the algorithm, photoabsorption sources at different depths can be reconstructed using just one set of data acquired in single laser shot. Unfocused plane transducer array and parallel data-acquisition (PDA) equipment are used for real-time photoacoustic (PA) signal detection and acquisition. RESULTS: The spatial resolution of the 3D PAI system was analyzed. Two graphite rods at various positions in a simulation model and two bifurcate vessels in the ear of rabbit were imaged. In addition, the motion trace of one particle flowing at constant velocity was captured dynamically. Experimental results showed that spatial phase-controlled algorithm based on plane transducer array and PDA system was capable of static and dynamic 3D PAI. CONCLUSIONS: Spatial phase-controlled algorithm is introduced for 3D image reconstruction. The PA signals are collected by plane transducer array and PDA system in single pulse excitation. The acquired volumetric data are sufficient for 3D image reconstruction. Therefore, tissue can avoid the long-term exposure to light source and it is safer than the current PAI for in vivo imaging. With an increase in the repetition rate of laser pulse and speed of image display, the imaging method will realize real-time 3D imaging, which will be significant in clinical detection and medical diagnosis.
机译：目的：在许多文献中已经报道了用于生物组织的非侵入性成像的光声成像（PAI）。但是，该新技术仍存在一些缺点，例如成像效率差。在当前的PAI中，激光的多次激发和信号的多次采集对于图像重建是必需的。在这种情况下，激光脉冲可能会由于能量积聚而伤害生物组织。为了在临床应用中普及PAI，有必要开发一种新的成像方法以提高PAI的效率。方法：提出了一种空间相位控制算法，用于全场三维（3D）图像重建。通过使用该算法，仅使用一次激光照射中获得的一组数据就可以重建不同深度的光吸收源。未聚焦的平面换能器阵列和并行数据采集（PDA）设备用于实时光声（PA）信号检测和采集。结果：分析了3D PAI系统的空间分辨率。对模拟模型中不同位置的两个石墨棒和兔子耳朵中的两个分叉血管成像。另外，动态捕获了一个恒速流动的粒子的运动轨迹。实验结果表明，基于平面换能器阵列和PDA系统的空间相位控制算法能够实现静态和动态3D PAI。结论：引入了空间相位控制算法进行3D图像重建。 PA信号由平面换能器阵列和PDA系统在单脉冲激励下收集。所获取的体积数据足以用于3D图像重建。因此，组织可以避免长期暴露在光源下，并且比目前用于体内成像的PAI更安全。随着激光脉冲重复频率的提高和图像显示速度的提高，该成像方法将实现实时3D成像，这对临床检测和医学诊断具有重要意义。

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