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Chapter 5.Measurements and Calculations 5 - 3

▐ M Mode

Measurement Type Range Accuracy Notes

Depth

25 cm +/- 2% or 2 mm

Time

0.01-10.2 sec +/- 2% or 0.2 sec

Velocity

0.01-1,000 cm /sec +/- 4 %

NOTE

1. The accuracies are calculated using following equations: Distance error (2% or

2mm ) = Image Pixel error (1% or 1mm) + Hardware error (1% or 1mm)

Time error (2% or 0.2 sec )= Image Pixel error (1% or 0.1 sec) + Hardware error

(1% or 0.1 sec)

Velocity error (4%)= Distance / Time

2. The phantom used is Multi-purpose phantom, RMI 413, from GAMMAX, Inc. USA

▐ DOPPLER Mode

Measurement Type Range Accuracy Notes

Time

0.01-4.3sec +/- 2% or 0.2 sec

Velocity

0.15-200 cm /sec +/- 15 %

NOTE

1. The phantom used is Doppler phantom, RMI 1425A, from GAMMAX, Inc., USA.

2. The accuracies cited in the above table arise from the positioning of the cursors on

the Doppler display and subsequent measurements made. The velocity tests can

therefore be used to check these values since these are not indicators of the

underlying absolute velocity assurance. The absolute velocity accuracy is tested

using a series of phantom measurements.

Absolute Doppler Velocity Accuracy:

Accuracy is defined as the difference between a calibrated phantom velocity and that annotated

as the time-averaged mean by the system. The time-averaged mean is calculated as the

average over a determined period of time of the intensity-weighted mean of the spectrum.

All probes have been tested to ensure that the time-averaged mean velocity falls within +/- 15%

of that annotated on the phantom. Due to Doppler phantom constraints, these tests have been

conducted in the range 15 cm/sec to 110 cm/sec.

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