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Photoacoustic–Ultrasound Tomography With S-Sequence Aperture Encoding

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A combined photoacoustic–ultrasound (PAUS) tomography system is introduced using ring-array and novel aperture encoding schemes. The ultrasound subsystem is able to achieve diffraction limited half-wavelength isotropic in-plane spatial resolution unlike… Click to show full abstract

A combined photoacoustic–ultrasound (PAUS) tomography system is introduced using ring-array and novel aperture encoding schemes. The ultrasound subsystem is able to achieve diffraction limited half-wavelength isotropic in-plane spatial resolution unlike previous systems. S-sequence aperture encoding improves signal-to-noise ratio (SNR) for the ultrasound tomography (UST) subsystem. We measured an average resolution of $139 \pm 44~\mu \text{m}$ for S-sequence UST and a resolution of $180 \pm 32~\mu \text{m}$ for photoacoustic tomography. We were able to measure SNR improvement using S-sequence spatial encoding using tissue-mimicking phantoms, and we displayed a composite PAUS phantom image.

Keywords: tomography; photoacoustic ultrasound; aperture encoding; sequence; sequence aperture

Journal Title: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Year Published: 2017

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