Edge Ultrasound System Betriebsanweisung PDF herunterladen (Seite 70)

58 Exam-based calculations

4 Using the touchpad, trace the waveform.

To make a correction, select Undo on-screen,

backtrack with the touchpad, or press the

BACKSPACE key.

5 Press the

SET key to complete the trace.

6 Save the calculation. (See “To save a

calculation” on page 47.)

For information on the automatic trace tool, see

“To trace automatically (Doppler)” on

page 46.

To calculate Right Ventricular Systolic

Pressure (RVSP)

1 On a frozen Doppler spectral trace, press the

CALCS key.

2 From the calculations menu, select TV and then

select TRmax.

3 Position the caliper. (See “Working with

calipers” on page 43.)

4 Save the calculation. (See “To save a

calculation” on page 47.)

5 To adjust the RA pressure, see “To delete a

vascular or cardiac measurement” on

page 72.

Changing the RA pressure from the default 5

affects the RVSP calculation in the patient

report.

To calculate Pressure Half Time (PHT) in

MV, AI, or TV

1 On a frozen Doppler spectral trace, press the

CALCS key.

2 From the calculations menu, select MV, AV, or

TV, and then select PHT.

3 Position the first caliper at the peak, and press

the

SELECT key.

A second caliper appears.

4 Position the second caliper:

• In MV, position the caliper along the EF

slope.

• In AV, position the caliper at the end

diastole.

5 Save the calculation. (See “To save a

calculation” on page 47.)

To calculate Proximal Isovelocity Surface

Area (PISA)

The PISA calculation requires a measurement in 2D,

a measurement in Color, and two measurements in

Doppler spectral trace. After all measurements are

saved, the result appears in the patient report.

1 Measure from Ann D (2D):

a On a frozen 2D image, press the

CALCS key.

b From the calculations menu, locate PISA,

and then select Ann D.

c Position the calipers. (See “Working with

calipers” on page 43.)

d Save the calculation. (See “To save a

calculation” on page 47.)

2 Measure from Radius (Color):

a On a frozen Color image, press the

CALCS

key.

b From the calculations menu, select Radius.

c Position the calipers.

d Save the calculation.

3 On a frozen Doppler spectral trace, press the

CALCS key.

4 Do the following to measure from MR VTI and

again to measure from MV VTI (Doppler):

a From the calculations menu, select PISA and

then select MR VTI or MV VTI.

b Position the caliper at the start of the

waveform, and press the

SELECT key to start

the trace.

c Using the touchpad, trace the waveform.

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