TC 87

Ultrasonics

 

Detail

Committee
Working Groups
Project Leader

Current

Status

Frcst Pub

Date

Stability

Date

TC 87WG 6Mr Thomas L. SzaboBPUB2020-122021

History

Stage
Document
Downloads
Decision Date
Target Date
AMW
87/572/RR PDF file 93 kB
2015-06-05 
1CD
87/573/CD PDF file 2218 kB
2015-06-062015-06
ACDV
87/585/CC Word file 79 kB
PDF file 577 kB
2015-09-182015-10
ACD
87/585A/CC PDF file 421 kB
Word file 76 kB
2017-07-282017-07
2CD
87/663/CD PDF file 1944 kB

2017-08-042017-07
PCC
2017-10-272017-10
ACDV
87/670/CC PDF file 864 kB
Word file 57 kB
2017-11-032017-12
ACDV
87/670A/CC PDF file 365 kB
Word file 88 kB
2017-11-032017-12
TCDV
2018-07-232018-07
CCDV
87/699/CDV
PDF file 2884 kB
2018-09-142018-09
CCDV
87/699(F)/CDV PDF file 2978 kB
2018-09-142018-09
PRVC
2018-12-072018-12
AFDIS
87/724/RVC PDF file 495 kB
Word file 52 kB
2019-08-302019-08
TFDIS
2019-09-042019-08
AFDIS
87/724A/RVC PDF file 658 kB
Word file 66 kB
2019-09-182019-09
DECFDIS
2020-05-262019-09
RFDIS
2020-06-082020-06
CFDIS
87/746/FDIS
2020-09-042020-08
PRVD
2020-10-162020-10
APUB
87/749/RVD PDF file 161 kB
2020-10-232020-10
BPUB
2020-10-232020-10
PPUB
 2020-12

Abstract

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. where the influence of shear waves and elastic anisotropy is small), including soft tissues and tissue-mimicking gels. Any aspects of the field that affect their theoretical description or are important in design are also included. These definitions would have use in scientific communications, system design and description of the performance and safety of systems using these devices.
IEC 61828:2021 incorporates definitions from other related standards where possible, and supplies more specific terminology, both for defining focusing characteristics and for providing a basis for measurement of these characteristics.

IEC 61828:2021 cancels and replaces the first edition published in 2001. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Clause 6 on Measurement procedures has been replaced by Clause 6: "Acoustic field measurement: equipment" and Clause 7: "Measurement procedure" and related definitions.
b) Reorganization of definitions and measurement section to accommodate specific sets of measurements for focusing, nonlinearity, beam axis alignment, beam area, beam maximum, numerical projection, plane wave, high intensity therapeutic ultrasound, multiple sources, spatial impulse response and compound plane waves. Clause 3 has been moved to Annex B.
c) The normative references have been updated and the Bibliography has been expanded from 8 to 40 references.
d) Twelve figures have been updated and seven new figures (B.1, B.3, B.7, B.10, B.11, B.12, B.13, B.14) have been added to facilitate measurements and be consistent with measurement terminology.
e) New measurements have been added for time delays, arrays, plane waves and spatial impulse response.
f) Annex A has been expanded to provide general guidance on pulsed waves, system responses, focusing gains and minimum beamwidth estimation.
g) New annexes have been added:
• Annex B (informative) Rationale for focusing and nonfocusing definitions
• Annex E (informative) Uncertainties;
• Annex F (informative) Transducer and hydrophone positioning systems;
• Annex G (informative) Planar scanning of a hydrophone to determine acoustic output power;
• Annex H (informative) Properties of water;
In addition, Annex A was reorganized and new Clauses A.1, A.5 and A.6 were added.
h) Guidelines for remaining within the manufacturer’s pressure and intensity hydrophone limits and the determination of the extent of nonlinearity in the field have been added.

Project

IEC 61828 ED2

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

 

 

Associated Documents:

87/546A/RM

PDF file 142 kB