
5-7
Chapter 5 Measurements And Calculations
2D Mode
Measurements
System Tolerance:
(Whichever is greater)
Test
Methodology
Accuracy
(1)
Based on
Range
(2)
Axial Distance < +/- 4% or 2mm Phantom Acquisition .01 – 25 cm
Lateral Distance < +/- 4% or 2mm Phantom Acquisition .01 – 35 cm
Axial Resolution < +/- 4% or 3mm Phantom Acquisition .01 – 25 cm
Lateral Resolution < +/- 4% or 3mm Phantom Acquisition .01 – 35 cm
(1)
The accuracy of the measurement diers depending on the user’s skill level as well as the table
above.
(2)
The unit of distance and circumference is cm. It is given in up to two decimal points.
M Mode
Measurements
System Tolerance:
(whichever is greater)
Test
Methodology
Accuracy
(1)
Based on
Range
(2)
Depth <+/- 5% or 3 mm Phantom Phantom 1 - 25 cm
Time < +/- 5%. Signal generator Phantom .01 - 11.3 sec
(1)
The accuracy of the measurement diers depending on the user’s skill level as well as the table
above.
(2)
The unit of distance and circumference is cm. The unit of velocity is cm/s. It is given in up to two
decimal points.
PW Spectral Doppler Mode
Doppler
Measurement
System Tolerance
(whichever is greater)
Methodology Range
(2)
Velocity < ± 15% Phantom 0.1cm/s – 8.8 m/s
Time < +/- 5%. Signal generator .01 - 11.3 sec
(1)
The accuracy of the measurement diers depending on the user’s skill level as well as the table
above.
(2)
The unit of distance and circumference is cm. The unit of velocity is cm/s. It is given in up to two
decimal points.
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