AS/NZS 4966:2002

1 - AS/NZS 4966:2002 ULTRASONICS-PULSED DOPPLER DIAGNOSTIC SYSTEMS-TEST PROCEDURES TO DETERMINE PERFORMANCE
4 - PREFACE
5 - CONTENTS
7 - INTRODUCTION
9 - 1 Scope
9 - 2 Normative references
9 - 3 Definitions
9 - 3.1 6 dB spectral width
10 - 3.2 20 dB spectral width
10 - 3.3 acoustic working frequency
10 - 3.4 aliasing
10 - 3.5 baseline frequency shift
10 - 3.6 B-mode (brightness-modulated display)
10 - 3.7 clutter
10 - 3.8 dead zone
10 - 3.9 directional
10 - 3.10 direction resolving
11 - 3.11 Doppler angle
11 - 3.12 Doppler demodulator
11 - 3.13 Doppler frequency
11 - 3.14 Doppler output connector
11 - 3.15 Doppler output
11 - 3.16 Doppler spectrum
11 - 3.17 Doppler test object
11 - 3.18 Doppler ultrasound systems
11 - 3.19 duplex scanner
11 - 3.20 nominal Doppler beam direction axis
12 - 3.21 nominal first lateral Doppler beam axis
12 - 3.22 nominal second lateral Doppler beam axis
12 - 3.23 nominal sample volume length
12 - 3.24 non-directional
12 - 3.25 Nyquist limit frequency
12 - 3.26 observed velocity
12 - 3.27 output channel
12 - 3.28 output device
12 - 3.29 phase-quadrature demodulation
13 - 3.30 pulse repetition frequency (PRF)
13 - 3.31 range gate
13 - 3.32 reference signal
13 - 3.33 sample volume
13 - 3.34 scan plane
13 - 3.35 sonogram
13 - 3.36 spectral width
13 - 3.37 spectrum
13 - 3.38 string test object
13 - 3.39 system
14 - 3.40 target
14 - 3.41 target depth
14 - 3.42 triplex scanner
14 - 4 Symbols
14 - 5 Overall tests of complete systems
14 - 5.1 General considerations
14 - 5.1.1 Types of pulsed Doppler ultrasound systems
15 - 5.1.2 Worst-case conditions
16 - 5.1.3 Doppler beam axes
16 - 5.1.4 Probe/target distance variation and measurement
17 - 5.2 Initial conditions
17 - 5.2.1 Power supply
17 - 5.2.2 Target movement direction
17 - 5.2.3 Propagation medium
18 - 5.2.4 Penetration depth
18 - 5.2.5 Working depth
18 - 5.2.6 Focusing
18 - 5.2.7 Working Doppler angle
19 - 5.2.8 Wall-thump filter cut-off frequency
19 - 5.2.9 Transmitter output power
19 - 5.2.10 Working pulse repetition frequency (PRF)
19 - 5.2.11 Doppler (receiver) gain
19 - 5.2.12 Test frequency
19 - 5.2.13 Working sample volume length
19 - 5.2.14 Doppler signal power measurement
19 - 5.3 Zero signal noise level
20 - 5.4 Doppler frequency response
20 - 5.4.1 Frequency response range
20 - 5.4.2 Deviation from flat response
20 - 5.4.3 Large signal performance
21 - 5.5 Spatial response
21 - 5.5.1 Sample volume response
22 - 5.6 Sample volume position registration error
23 - 5.7 Beam position and orientation
24 - 5.8 Intrinsic broadening
24 - 5.9 Dead zone
24 - 5.10 Acoustic working frequency
24 - 5.11 Flow direction separation
24 - 5.12 Velocity estimation accuracy
24 - 5.13 Volume flow estimation accuracy
25 - 5.14 Maximum, mean, mode and median frequency estimation accuracy
27 - 5.15 Velocity waveform indices estimation accuracy
28 - 6 Doppler test objects
28 - 6.1 Test objects
28 - 6.2 Electronic test object
30 - Annex A - Description of pulsed Doppler ultrasound systems
30 - A.1 Single-channel system
31 - A.2 Multi-channel system
31 - A.3 Aliasing
31 - A.4 Duplex and triplex scanners
34 - Bibliography

Describes test methods for measuring the performance of pulsed Doppler ultrasound systems, and applies to tests made on overall pulsed Doppler ultrasound system which is not disassembled or disconnected, and to tests made on pulsed Doppler ultrasound systems whether they are stand-alone or as part of another ultrasound instrument. Electrical safety, acoustic output and electromagnetic compatibility (EMC) are not covered in this technical specification. It is identical with and reproduced from IEC TS 61895:1999.

This technical specification describes– test methods for measuring the performance of pulsed Doppler ultrasound systems;– Doppler test objects for carrying out these tests; and applies to– tests made on an overall pulsed Doppler ultrasound system, a system which is not disassembled or disconnected;– tests made on pulsed Doppler ultrasound systems whether they are stand-alone or as part of another ultrasound instrument.Electrical safety, acoustic output and electromagnetic compatibility (EMC) are not covered in this technical specification.The workload to perform all described tests is, in general, prohibitive. It is intended that a subset of the described tests is adopted for regular use. However, experience to give guidance for selection has still to be gathered and will be the subject of ongoing work.

First published as AS/NZS 4966:2002.