Figure, B-Mode ultrasound showing main portal] - StatPearls - NCBI Bookshelf

B-Mode ultrasound showing main portal vein diameter of 15.1 millimeters. This is an indirect finding of portal hypertension. Contributed by Brian Covello, MD

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Figure, Ultrasound Phased Array Probe Contributed by Chris Borowy, DO] - StatPearls - NCBI Bookshelf

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Can a false negative for a carotid ultrasound be the result of incorrect technique by a technician? - Quora