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[Preprint]. 2023 Mar 15:2023.03.14.532661. [Version 1] doi: 10.1101/2023.03.14.532661

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Fig. 1 — a,b, Schematic of the PACTER system in the calibration (a) and imaging (b) procedures. HWP, half-wave plate; PBS, polarizing beamsplitter; BT, beam trap; DAQ, data acquisition unit. The differences between the two modes are highlighted in the black dotted boxes. c, Schematic of the single-element ultrasonic transducer fabricated on the ER. d, 1D (t) PACTER signals detected by the ultrasonic transducer at time instances t₀, t₁, and t_N. e, Reconstruction of a 4D (xyzt) image of human palmar vessels from the signals in d. Norm., normalized. Scale bar, 1 mm.