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A: Number of regions containing extravasations as a function of ultrasound frequency. B: The density of extravasations vs. frequency. This density was defined as the number of areas with extravasation divided by πr2, where r is the half width of beam plots measured in water with a needle hydrophone. Lower ultrasound frequencies had fewer cells per unit area on average, but substantial variation was present. C: MRI contrast enhancement. Mean ± standard deviation shown.
