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Measurement references
6-3
Sources of measurement errors
In general, two types of errors can be introduced into the measurement:
Acquisition Error:
Includes errors introduced by the ultrasound system electronics relating to signal
acquisition, signal conversion, and signal processing for display. Additionally, computational and display
errors are introduced by the generation of the pixel scale factor, application of that factor to the caliper
positions on the screen, and the measurement display.
Algorithmic Error:
The error introduced by measurements, which are input to higher order calculations.
This error is associated with floating-point versus integer-type math, which is subject to errors introduced
by rounding versus truncating results for display of a given level of significant digit in the calculation.
Heart Rate
< +/- 2% plus (Full Scale
c
* Heart Rate/100)%
Acquisition
Phantom
d
5-923 bpm
Table 6-3: PW Doppler Mode Measurement and Calculation Accuracy and Range
Doppler Mode
Measurement
Accuracy and Range
System Tolerance
Accuracy By
Test Method
a
Range
Velocity cursor
< +/- 2% plus 1% of full
scale
b
Acquisition
Phantom
0.01 cm/sec-
550 cm/sec
Frequency cursor
< +/- 2% plus 1% of full
scale
b
Acquisition
Phantom
0.01kHz-20.8
kHz
Time
< +/- 2% plus 1% of full
scale
c
Acquisition
Phantom
0.01-10 sec
a
FUJIFILM SonoSite special test equipment was used.
b
Full scale for frequency or velocity implies the total frequency or velocity magnitude, displayed on the scrolling
graphic image.
c
Full scale for time implies the total time displayed on the scrolling graphic image.
Table 6-2: M Mode Measurement and Calculation Accuracy and Range
M Mode Measurement
Accuracy and Range
System Tolerance
Accuracy By
Test Method
Range
a
Full scale for distance implies the maximum depth of the image.
b
An RMI 413a model phantom with 0.7 dB/cm MHz attenuation was used.
c
Full scale for time implies the total time displayed on the scrolling graphic image.
d
FUJIFILM SonoSite special test equipment was used.
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 ...