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Number of vascular branching points seen on MRI and PAI. (a) Image from a patient with invasive carcinoma acquired by PAI. Scale bar, 20 mm. (b) Image from the same patient acquired by MRI. Scale bar, 20 mm. (c) Comparison of the number of vascular branching points between MRI and PAI based on MRI images. *p < 0.01 (Wilcoxon signed-rank test), MRI, magnetic resonance imaging; PAI, photoacoustic imaging.
