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. 2016 Apr 28;6:25236. doi: 10.1038/srep25236

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(A) Main components of the collinear catheter before assembly. (B) Assembled IVPA catheter probe. (C) Zoom-in view of the catheter tip with illustration of collinear overlap between optical and ultrasonic waves. (D) Photograph of the fabricated catheter probe with a diameter of 1.6 mm, and the detailed structure of the catheter tip (inset).