Ultrasonics - Transducers - Definitions and measurement methods regarding focusing for the transmitted fields

IEC 61828:2020

- provides definitions for the transmitted field characteristics of focusing and nonfocusing transducers for applications in medical ultrasound;

- relates these definitions to theoretical descriptions, design, and measurement of the transmitted fields of focusing transducers;

- gives measurement methods for obtaining defined field characteristics of focusing and nonfocusing transducers;

- specifies beam axis alignment methods appropriate for focusing and nonfocusing transducers.

IEC 61828:2021 relates to focusing ultrasonic transducers operating in the frequency range appropriate to medical ultrasound (0,5 MHz to 40 MHz) for both therapeutic and diagnostic applications. It shows how the characteristics of the transmitted field of transducers can be described from the point of view of design, as well as measured by someone with no prior knowledge of the construction details of a particular device. The transmitted ultrasound field for a specified excitation is measured by a hydrophone in either a standard test medium (for example, water) or in a given medium. This document applies only to media where the field behaviour is essentially like that in a fluid (i.e. wh