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Example ultrasound blood flow images taken from a rabbit kidney. (a) Conventional color Doppler flow imaging is limited to the larger vessels, predominantly in the medullary region. (b) Ultra-sensitive Doppler, enabled by ultra-fast ultrasound imaging, reveals small vessels in the kidney cortex (reprinted from [76]). (c) Super-resolution ultrasound imaging can resolve these cortical microvessels without sacrificing penetration depth (reprinted from [77]).
