User guide

Chapter 4: Measurements and Calculations 57
Measurements
c Using the touchpad, trace the left ventricular
(LV) cavity.
To make a correction, select Undo on-screen
or press the
BACKSPACE key.
d Complete the trace, and press the
SET key.
e Save the calculation. (See “To save a
calculation” on page 47.)
To calculate MV or AV area
1 On a frozen 2D image, press the CALCS key.
2 In the calculations menu, locate Area, and then
select MV or AV.
3 Position the caliper where you want to begin the
trace, and press the
SELECT key.
4 Using the touchpad, trace the desired area.
To make a correction, select Undo on-screen or
press the
BACKSPACE key.
5 Complete the trace, and press the
SET key.
6 Save the calculation. (See “To save a
calculation” on page 47.)
To calculate LV Mass
1 On a frozen 2D image, press the CALCS key.
2 In the calculations menu, locate LV Mass.
3 Do the following for EPI and then for Endo:
a Select the measurement name from the
calculations menu.
b Position the caliper where you want to begin
the trace, and press the
SELECT key.
c Using the touchpad, trace the desired area.
To make a correction, select Undo on-screen
or press the
BACKSPACE key.
d Complete the trace, and press the
SET key.
e Save the calculation. (See “To save a
calculation” on page 47.).
4 Select Apical from the calculations menu.
5 Positioning the calipers, measure the ventricular
length. (See “Working with calipers” on
page 43.)
6 Save the calculation.
To measure peak velocity
For each cardiac measurement, the system saves
up to five individual measurements and calculates
their average. If you take more than five
measurements, the most recent measurement
replaces the fifth one. If you delete a saved
measurement from the patient report, the next
measurement taken replaces the deleted one in the
patient report. The most recently saved
measurement appears at the bottom of the
calculations menu.
1 On a frozen Doppler spectral trace, press the
CALCS key.
2 From the calculations menu, select MV, TV, TDI,
or P. Vein.
3 Do the following for each measurement you
want to take:
a Select the measurement name from the
calculations menu.
b Position the calipers. (See “Working with
calipers” on page 43.)
c Save the calculation. (See “To save a
calculation” on page 47.)
To calculate Velocity Time Integral (VTI)
Note: This calculation computes other results in
addition to VTI. See the table
“Cardiac
Calculations”
on page 53.
1 On a frozen Doppler spectral trace, press the
CALCS key.
2 From the calculations menu, select VTI under
MV, AV, TV, PV, or LVOT.
3 Position the caliper at the start of the waveform,
and press the
SELECT key to start the trace.