FujiFilm SonoSite X-Porte User Manual page 208

PSV = peak systolic velocity
EDV = end diastolic velocity
V = mean flow velocity throughout the entire cardiac cycle
Note
Zwiebel, W. J. Introduction to Vascular Ultrasonography
PI = (PSV - MDV) / V (no units)
where:
PSV = peak systolic velocity
MDV = Minimum diastolic velocity
V = TAP (Time Averaged Peak) flow velocity throughout the cardiac cycle
Resistive Index (RI)
Kurtz, A.B., W.D. Middleton. Ultrasound-the Requisites. Mosby Year Book, Inc., (1996), p.467.
RI = ((Velocity A – Velocity B)/Velocity A) in measurements
where:
A = velocity cursor +
B = velocity cursor x
Time Averaged Mean (TAM) in cm/s
TAM = mean (mean Trace)
Time Averaged Peak (TAP) in cm/s
TAP = mean (peak Trace)
Volume (Vol)
Beyer, W.H. Standard Mathematical Tables, 28th ed., CRC Press, Boca Raton, FL, (1987), p.131.
Volume Bladder
Dicuio, M., et al. "Measurements of urinary bladder volume: comparison of five ultrasound calculation
methods in volunteers." Arch. Ital. Urol Androl
Volume Flow (VF) in ml/m
Allan, Paul L. et al. Clinical Doppler Ultrasound, 4th ed., Harcourt Publishers Limited. (2000), p.36-38.
One of the following, depending on the Live Trace setting:
VF = CSA * TAM * 60
VF = CSA * TAP * 60
VF = CSA * TAV * 60 (When manual trace is used)
6-22
When using Auto Measure, the mean flow velocity is TAP (Time Average Peak).
6th Edition, W.B. Saunders Company, 2012.
,
(2005) Mar:77(1): p.60-2.
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Measurement references