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首页> 外文会议>Photons Plus Ultrasound: Imaging and Sensing 2007; Progress in Biomedical Optics and Imaging; vol.8 no.14; Proceedings of SPIE-The International Society for Optical Engineering; vol.6437 >Photoacoustic Imaging Using Array Transducer
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Photoacoustic Imaging Using Array Transducer

机译：使用阵列换能器的光声成像

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摘要

To perform ultrasound imaging using an array transducer, a focused ultrasound beam is transmitted in a particular direction within the tissue and the received backscattered ultrasound wave is then dynamically focused at every position along the beam. The ultrasound beam is scanned over the desired region to form an image. The photoacoustic imaging, however, is distinct from conventional ultrasound imaging. In photoacoustic imaging the acoustic transients are generated simultaneously in the entire volume of the irradiated tissue - no transmit focusing is possible due to light scattering in the tissue. The photoacoustic waves are then recorded on every element of the ultrasound transducer array at once and processed to form an image. Therefore, compared to ultrasound imaging, photoacoustic imaging can utilize dynamic receive focusing only. In this paper, we describe the image formation algorithms of the array-based photoacoustic and ultrasound imaging system and present methods to improve the quality of photoacoustic images.rnTo evaluate the performance of photoacoustic imaging using an array transducer, numerical simulations and phantom experiments were performed. First, to evaluate spatial resolution, a point source was imaged using a combined ultrasound and photoacoustic imaging system. Next, image quality was assessed by imaging tissue imaging phantoms containing a circular inclusion. Finally, the photoacoustic and ultrasound images from the combined imaging system were analyzed.
机译：为了使用阵列换能器执行超声成像，在组织内沿特定方向发射聚焦的超声波束，然后将接收到的反向散射超声波动态聚焦在沿该束的每个位置。在所需区域上扫描超声波束以形成图像。然而，光声成像不同于常规的超声成像。在光声成像中，在被照射的组织的整个体积中会同时生成声音瞬变-由于组织中的光散射，无法进行透射聚焦。然后，将光声波立即记录在超声换能器阵列的每个元件上，并进行处理以形成图像。因此，与超声成像相比，光声成像只能利用动态接收聚焦。在本文中，我们描述了基于阵列的光声和超声成像系统的图像形成算法，并提出了提高光声图像质量的方法。为了评估使用阵列换能器的光声成像的性能，进行了数值模拟和幻像实验。首先，为了评估空间分辨率，使用超声和光声成像组合系统对点源成像。接下来，通过对包含圆形夹杂物的组织成像体模进行成像来评估图像质量。最后，分析了来自组合成像系统的光声和超声图像。

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