Fig. 5From: Chronic cranial window for photoacoustic imaging: a mini reviewa A schematic diagram of the ultrasound-sensing cranial window implant [42]. b Comparison of MRR Q-factors with and without the protection layer in whole blood. c A photograph of a fabricated chronic cranial window in mice. d A typical PA image of cortical vasculature in mice. e-h PA images of the cortical vasculature in the same area over a period of 28 daysBack to article page