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AS/NZS 4190:1994

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AS/NZS 4190:1994

Ultrasonics - Fields - Guidance for the measurement and characterization of ultrasonic fields generated by medical ultrasonic equipment using hydrophones in the frequency range 0.5 MHz to 15 MHz

Standards Australia

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Table of Contents

1 -  AS/NZS 4190:1994 ULTRASONICS - FIELDS - GUIDANCE FOR THE MEASUREMENT AND CHARACTERIZATION OF ULTRASONIC FIELDS GENERATED B...
4 -  PREFACE
 5 -  CONTENTS
 6 -  1 Scope
 6 -  2 Normative references
 6 -  3 List of symbols
 7 -  4 Types of medical ultrasonic equipment
7 -  4.1 Pulse-echo and pulsed Doppler equipment
 8 -  4.2 Continuous-wave Doppler systems
 9 -  4.3 Therapy transducers
 10 -  5 Measuring conditions
10 -  5.1 Choice of size of the hydrophone acti ve element
 11 -  5.2 Hydrophone cable l ength and ampli fiers
 13 -  5.3 Rotation of the hydrophone
 13 -  5.4 Hydrophone posit i oni ng
 13 -  5.5 Avoiding reflecti on effects usi ng membrane hydrophones
 14 -  6 Simplified procedures and gui delines
14 -  6.1 Procedures
 15 -  6.2 Useful relationships between acoustical parameters
 16 -  7 Acoustic parameter specification
 18 -  Annex A - Bandwidth and spatial-averaging corrections
18 -  A.1 Non-linear distortion
 21 -  A.2 Spatial averaging
 23 -  A.3 Uncertainties
 28 -  Annex B - Bibliography

Abstract

Provides guidance on the practical measurement of the acoustic output of various types of medical ultrasonic equipment in the frequency range of 0.5 MHz to 15 MHz based on the use of hydrophones. It is identical with and reproduced from IEC 1220:1993.

Scope

This technical report provides guidance on the practical measurement of the acoustic output of various types of medical ultrasonic equipment in the frequency range 0,5 MHz to 15 MHz based on the use of hydrophones.
It gives simplified procedures and guidelines for the measurement of the acoustic output of medical ultrasonic equipment. Procedures for correcting for limitations caused by the use of hydrophones with finite bandwidth and finite active element size are also given.

General Product Information

Document Type Standard
Status Current
Publisher Standards Australia
ProductNote Pending Revision indicates that as a result of the Aged Standards review process, the document needs updating. If no project proposal, meeting the quality criteria, is received within the 12 month timeframe, the document shall be withdrawn.
Committee HE-003