Figure 2.

Phantom imaging with the COE probe. (A) Optoacoustic image of the phantom obtained with the probe (outlined as a solid gray circle), in which four sutures (labeled as p₁p₄) were positioned around the capsule at different distances. The inset is the point spread function of pointp₁. Scale bar, 2 mm. (B) Transversal (solid line, open circles) and radial resolutions (dotted line, solid circles) along the depth direction, calculated from the FWHM values of the four sutures. (C) SNR for each suture in the phantom obtained following optoacoustic imaging with the miniature preamplifier attached to the transducer (solid line, open circles) or without the preamplifier (dotted line, solid circles). (D) Schematic of the geometric shapes printed on paper, and rolled around the capsule probe. (E) Corresponding RMIP (radial maximum intensity projection) image of the paper phantom in panel (E). Scale bar, 2 mm