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A radiographic study of intrarenal arteries. Mediscope 1973;16(1):19.
Doppler US with measurement of the RI in the intrarenal arteries is very useful as obstruction (except in the peracute stage) leads to intrarenal vasoconstriction with a consecutive increase of the RI above the upper limit of 0.7; however the case is different for non-obstructive dilatation.