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5-16
Measurements and calculations
Calculation results for each measurement include s (systolic) and d (diastolic).
To perform an Arterial calculation
1
On a frozen Doppler spectral trace, tap
Calcs
.
2
Do the following for each measurement you want to take:
Left
CCA
Proximal
Middle
Distal
Bulb
ICA
Proximal
Middle
Distal
ECA
Proximal
VA
Volume Flow
a
Diam(2D),TAM, TAP, or TAV (Doppler)
b
WARNINGS
Trace only a single heartbeat. The VTI calculation is not valid if measured with
more than one heartbeat.
Diagnostic conclusions about blood flow based on VTI alone can lead to
improper treatment. Accurate blood flow volume calculations require both the
vessel area and velocity of blood flow. In addition, accurate blood flow velocity
is dependent on a correct Doppler angle of incidence.
Table 5-3: Arterial calculations
Calculation list
Measurement name
a
See
“Considerations”
on page on page 5-12 for factors to consider when performing a volume flow calculation.
b
When the Doppler trace is measured, the result includes velocity time integral and time averaged velocity
calculations depending upon the trace type. When the waveform is manually traced, TAV and VTI are displayed.
When the waveform is automatically traced using Peak, Time Averaged Peak (TAP) and VTI are displayed. When
the waveform is automatically traced using Mean, Time Averaged Mean (TAM) is displayed and VTI is not
displayed.
Summary of Contents for SONOSITE X-PORTE
Page 1: ...USER GUIDE ...
Page 75: ...Setting up the system 3 39 ...
Page 76: ...3 40 Setting up the system ...
Page 128: ...4 52 Imaging ...
Page 186: ...5 58 Measurements and calculations ...
Page 210: ...6 24 Measurement references ...
Page 234: ...8 16 Cleaning and disinfecting ...
Page 262: ...9 28 Safety ...
Page 334: ...10 72 Acoustic output ...
Page 364: ...B 14 Index printing 5 56 zoom 4 23 ...
Page 365: ......
Page 366: ...P14645 05 P14645 05 ...