IVPA imaging of a lipid-mimicking phantom comprised of a butter rod and a piece of porcine intramuscular fat.
(A) IVPA image in green color map. (B) IVUS image in gray color map. (C) Merged photoacoustic and ultrasound image. The 1 mm scale bar applies to all panels. The shapes and positions of butter and fat are highlighted in yellow ellipses in panel (A).