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Comparison of imaging resolution and imaging penetration depth for different modalities that are capable of vascular imaging. (2-photon: two-photon microscopy; LSF: laser-speckle flow imaging; MRI: magnetic resonance imaging; OCT: optical coherence tomography; PAM: photoacoustic microscopy (optical resolution); PET: positron emission tomography; US: ultrasound; VSD: voltage sensitive dye imaging).
