Synchronization of RF Data in Ultrasound Open Platforms (UOPs) for High-Accuracy and High-Resolution Photoacoustic Tomography Using the "Scissors" Programming Method.
Synchronization of RF Data in Ultrasound Open Platforms (UOPs) for High-Accuracy and High-Resolution Photoacoustic Tomography Using the "Scissors" Programming Method.
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DOI：
10.1109/tuffc.2022.3164371
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发表时间：
2022-06
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Synchronization is important for photoacoustic tomography but some fixed delays between the data acquisition and the light pulse are a common problem degrading imaging quality. Here, we present a simple yet versatile method named “Scissors” to help synchronize ultrasound open platforms (UOPs) for photoacoustic imaging. Scissors is a programmed function that can cut or add a fixed delay to RF data and thus synchronize it before reconstruction. Scissors applies the programmable metric of UOPs and has several advantages: It is compatible with many setups regardless of the synchronization methods, light sources, transducers, and delays. The synchronization is adjustable in steps reciprocal to the UOPs’ sampling rate (20-ns step with 50-MHz sampling rate). Scissors works in real-time photoacoustic imaging, and no extra hardware is needed. We programmed Scissors in Vantage UOP (Verasonics), and then imaged two 30-μm nichrome wires with a 20.2-MHz central frequency transducer. The PA image was severely distorted by a 828-ns delay; over 90% delay was caused by our Q-switch laser. The axial and lateral resolution are 112 μm and 167 μm, respectively, after using Scissors. We imaged a human finger in vivo and the imaging quality is tremendously improved after solving the 828-ns delay by using Scissors.
