# [Glossary] PW mode measurement

**The glossary of “Auto Measure”**

- HR (bpm)ļ¼Heart rate
- PSV (cm/s)ļ¼Peak systolic velocity
- EDV (cm/s)ļ¼End diastolic velocity
- PIļ¼Pulsatility index (of Gosling)
- PI = (PSVāEDV)/MV
- MV (cm/s)ļ¼Mean velocity

- RIļ¼Resistance index (of Pourcelot)
- RI = (PSVāEDV)/PSV

- VTI (cm)ļ¼Velocity-time integral
- TAV Max (cm/s)ļ¼The maximum of time-averaged velocity
- S/Bļ¼The average RI of a cycle
- S/Dļ¼Systolic/Diastolic Ratio
- S/D = PSV/EDV

- ACCL (cm/sĀ²)ļ¼The acceleration index
- ACCL = (PSV ā EDV)/ACCT

- ACCT (s)ļ¼The time from the lowest (EDV) to the highest (PSV)
- VFM (ml/min)ļ¼Volume flow per minute
- VFM Max (ml/min)ļ¼The maximum of volume flow per minute
- Diam (mm) ļ¼Diameter

ā VFM, VFM Max, Diam values will be shown when you are in the frozen state.

**The glossary of measure tool “PW V, T, HR”**

- T (s)ļ¼Time
- HR (bpm)ļ¼Heart rate
- Range (cm/s)ļ¼The range of flow velocity

**The glossary of measure tool “**RI, S/D”

- PSV (cm/s)ļ¼Peak systolic velocity
- EDV (cm/s)ļ¼End diastolic velocity
- S/Dļ¼Systolic/Diastolic Ratio
- S/D = PSV/EDV

- RIļ¼Resistance index (of Poucelot)
- RI = (PSVāEDV)/PSV

**The glossary of measure tool “**PI”

- PSV (cm/s)ļ¼Peak systolic velocity
- D (cm/s)ļ¼End diastolic velocity
- Area (cmĀ²)ļ¼Blood vessel cross-sectional area
- Diam (mm)ļ¼Diameter
- PIļ¼Pulsatility index (of Gosling)
- PI = (PSVāEDV)/MV
- MV (cm/s)ļ¼Mean velocity

- VFM Max (ml/min)ļ¼The maximum of volume flow per minute
- TAV Max (cm/s)ļ¼The maximum of time-averaged velocity

**The glossary of measure tool “**VTI”

- VTI (cm)ļ¼Velocity-time integral

**The glossary of measure tool “**E/A Ratio”

- E Vel. (cm/s): E wave velocity
- A Vel. (cm/s): A wave velocity
- E/A Ratio: Ratio of E- to A-wave velocities
- DT (ms): Deceleration time, early filling velocity, time interval from peak E-wave along the slope of LV filing extrapolated to the zero-velocity baseline.
- DT Slope (cm/sĀ²): Deceleration Slope