Fig. 4From: Recent advances in applications of multimodal ultrasound-guided photoacoustic imaging technologya PA spectra of 2 mg/mL SPNs2–3, PBS, and FBS; b PA signal of SPNs2–3 at various concentrations; c PA/US co-registered images without injection of SPNs2–3 (control) and with intratumoral injection of 50 μL, 500 μg/mL SPNs2–3 (dashed circles); d Fitted PA signal curves of SPNs2–3 solutions (1 mg/mL) at various depths in chicken breast tissue [22]Back to article page