Samsung SA8000 SE Manual do Utilizador descarregar pdf (Página 19)

Chapter 5.Measurements and Calculations 5 - 19

 Doppler Measurement Items

Result Calculation Date Equation

PSV (Peak Systolic Velocity) Velocity cm/s

EDV (End Diastolic Velocity) Velocity cm/s

Vmean (Mean Velocity) Velocity Calculated cm/s

Gmean (Mean Gradient) Gradient mmHg

Gpeak (Peak Gradient) Calculation mmHg 4 × PSV × PSV

RI (Resistively Index) Calculation Ratio (PSV – EDV) / PSV

S/D (PSV/EDV) Calculation Ratio PSV / EDV

PI (Pulsatility Index) Calculation Ratio (PSV – EDV) / Vmean

TAM(Time Average Mean) Velocity cm/s

Fetal HR HR BPM HR = #beats × 60 / Time

▐ Volume Flow Measurement Method

■ Both Volume Flow and stenosis can be measured.

■ Measure Volume Flow by selecting Volume Flow in the measurement menu and

measuring related items. Also, the Volume Flow value can be calculated by measuring

other items.

■ The following are the calculation formulas for Volume Flow.

60)(

= TAMAreaAVolumeFlow

)(

××

= TAM

DVolumeFlow

■ Use Vessel Area, TAM values to calculate Volume Flow.

- There are two ways to measure Vessel Area: one uses the circumference (Vessel

Area) and the other uses the distance (Vessel Dist). For further information, refer to

‘Basic Measurements’ in this chapter.

- The TAM (Time Avg. Mean Velocity) value is calculated only when Auto trace or

Limited trace is activated. For more information, refer to ‘Doppler Spectrum

Measurement Method’ in this chapter.

■ There are two ways to measure Stenosis % of each vascular system: one using the

area (%StA ), and the other using the distance ( %StD ).

- %Stenosis Area. : Calculates stenosis ratio using the area of vessels.

1. Select the %StA menu, and a cursor appears in 2D Mode.

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Samsung SA8000 SE Manual do Utilizador Página 19