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Acceleration index is an indirect sonographic sign to assess renal artery stenosis 1.
Acceleration index is used in the Doppler assessment of the renal arteries when assessing for renal artery stenosis.
Acceleration index is calculated by subtracting the initial systolic velocity from the peak systolic velocity and then dividing it by the time between those two points, known as the acceleration time.
Acceleration index = (v1-v0) / t
v1: peak systolic velocity (m/s)
v0: initial systolic velocity (m/s)
t: acceleration time (s)
The normal value of the acceleration index is >3 m/s2. Decreased values, together with other signs, may indicate renal artery stenosis.