Fig. 4. Photoacoustic images of a mouse bearing a HT29 tumor before and after intravascular injection of SiNc. Greyscale background is overlaid with the signal from SiNc (hot scale).
A) Pre-injection image, indicating tumor (dashed white circle) and surrounding blood vessels (BV, dotted red circles), overlaid with deoxygenated (blue scale) and oxygenated (red scale) hemoglobin signal. (B–F) Images acquired after 5 (B), 15 (C), 30 (D), 45 (E), 60 (F) minutes after intravenous injection of SiNc in a tumor-bearing animal. Reproduced with publisher permission.36