Fig. 7.

Multimodal endoscopy. (a-d) Tri-modal photoacoustic (PA), ultrasound (US), optical coherence tomography (OCT) imaging of a human artery. (a) PA; (b) US; (c) OCT, and (d) overlay. (a)-(d) was adapted from Ref. [116] with permission. (e) PA image of a mouse ear. (f) Co-registered PA and fluorescence image of a mouse ear at the same location with (e). (e)-(f) was adapted from Ref. [87] with permission. (g) PA image of a rabbit rectum. The blood oxygen saturation in two regions (dash boxes) are shown in corresponding hyperspectral images in (h) and (i). (g)-(i) was adapted from Ref. [118] with permission.