AS/NZS 4190:1994

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

Published
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If no project proposal, meeting the quality criteria, is received within the 12 month timeframe, the document shall be withdrawn.
Pages
ISBN
Committee	HE-003