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首页> 外文会议>Photons Plus Ultrasound: Imaging and Sensing 2006; Progress in Biomedical Optics and Imaging; vol.7, no.9 >A photoacoustic imaging system employing a curved-phased ultrasonic array and parallel electronics
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A photoacoustic imaging system employing a curved-phased ultrasonic array and parallel electronics

机译：使用弯曲相控超声阵列和并行电子器件的光声成像系统

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摘要

Real-time photoacoustic imaging requires ultrasonic array receivers and parallel data acquisition systems for the simultaneous detection of weak photoacoustic signals. In this paper, we introduce a newly completed ultrasonic receiving array system and report preliminary results of our measured point spread function. The system employs a curved ultrasonic phased array consisting of 128-elements, which span a quarter of a complete circle. The center frequency of the array is 5 MHz and the bandwidth is greater than 60%. In order to maximize the signal-to-noise ratio for photoacoustic signal detection, we utilized special designs for the analog front-end electronics. First, the 128 transducer-element signals were routed out using a 50-Ohm impedance matching PCB board to sustain signal integrity. We also utilize 128 low-noise pre-amplifiers, connected directly to the ultrasonic transducer, to amplify the weak photoacoustic signals before they were multiplexed to a variable-gain multi-stage amplifier chain. All front-end circuits were placed close to the transducer array to minimize signal lose due to cables and therefore improve the signal-to-noise ratio. Sixteen analog-to-digital converters were used to sample signals at a rate of 40 mega-samples per second with a resolution of 10-bits per sample. This allows us to perform a complete electronic scan of all 128 elements using just eight laser pulses.
机译：实时光声成像需要超声阵列接收器和并行数据采集系统来同时检测微弱的光声信号。在本文中，我们介绍了一个新近完成的超声波接收阵列系统，并报告了我们测得的点扩展函数的初步结果。该系统采用由128个元素组成的弯曲超声相控阵，该元素跨越一个完整的圆的四分之一。阵列的中心频率为5 MHz，带宽大于60％。为了使光声信号检测的信噪比最大化，我们为模拟前端电子设备采用了特殊设计。首先，使用50欧姆阻抗匹配的PCB板将128个换能器元件信号发送出去，以保持信号完整性。我们还利用了128个低噪声前置放大器，它们直接连接到超声换能器，以放大弱的光声信号，然后将它们复用到可变增益多级放大器链上。所有前端电路均放置在靠近换能器阵列的位置，以最大程度地减少由于电缆引起的信号损失，从而提高信噪比。使用十六个模数转换器以每秒40兆样本的速率对信号进行采样，每个样本的分辨率为10位。这样，我们仅使用八个激光脉冲就可以对所有128个元素执行完整的电子扫描。

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