FujiFilm SonoSite M-Turbo User Manual page 74

• In AV, position the caliper at the end
diastole.
Save the calculation. (See "To save a
5
calculation" on page 51.)
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
b From the calculations menu, locate PISA,
and then select Ann D.
c Position the calipers. (See "Working with
calipers" on page 47.)
d Save the calculation. (See "To save a
calculation" on page 51.)
2 Measure from Radius (Color):
a On a frozen Color image, press the
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
key.
CALCS
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
start the trace.
c Using the touchpad, trace the waveform.
62 Exam-based calculations
For information on the automatic trace tool, see
"To trace automatically (Doppler)" on page 50.
To calculate Isovolumic Relaxation Time
(IVRT)
1 On a frozen Doppler spectral trace, press the
2 From the calculations menu, select MV and
key.
CALCS
3 Using the touchpad, position the caliper at the
4 Press the
5 Using the touchpad, position the second
CALCS
6
To calculate Delta Pressure: Delta Time
(dP:dT)
To perform the dP:dT measurements, the CW
Doppler scale must include velocities of 300 cm/s
or greater on the negative side of the baseline.
(See "Spectral trace options" on page 32.)
1 On a frozen CW Doppler spectral trace, press
2 From the calculations menu, select MV, and
key to
SELECT
3 Position the first caliper along the waveform
To make a correction, select Undo
on‐screen, backtrack with the touchpad, or
press the
BACKSPACE
d Press the key to complete the trace.
SET
e Save the calculation.
key.
CALCS
then select IVRT.
A vertical caliper appears.
aortic valve closure.
key.
SELECT
A second vertical caliper appears.
caliper at onset of mitral inflow.
Save the calculation. (See "To save a
calculation" on page 51.)
the key.
CALCS
then select dP:dT.
A horizontal dotted line with an active caliper
appears at 100 cm/s.
at 100 cm/s.
key.