NF EN 61220 : 1995

Introduction
Clause
1 Scope
2 Normative references
3 List of symbols
4 Types of medical ultrasonic equipment
    4.1 Pulse-echo and pulsed Doppler equipment
    4.2 Continuous-wave Doppler systems
    4.3 Therapy transducers
5 Measuring conditions
    5.1 Choice of size of the hydrophone active element
    5.2 Hydrophone cable length and amplifiers
    5.3 Rotation of the hydrophone
    5.4 Hydrophone positioning
    5.5 Avoiding reflection effects using membrane
         hydrophones
6 Simplified procedures and guidelines
    6.1 Procedures
    6.2 Useful relationships between acoustical
         parameters
7 Acoustic parameter specification
Annexes
A (normative) Bandwidth and spatial-averaging
               corrections
B (informative) Bibliography
ZA (normative) Other international standards quoted in
               this standard with the references of the
               relevant European publications

Gives advice on the practical measurement of the acoustic output of various types of medical ultrasonic equipment in the 0,5 MHz to 15 MHz frequency range based on the use of hydrophones. Also gives procedures for correcting for limitations caused by the use of hydrophones with finite bandwidth and active element size.