DIN EN 61828:2016-02 (Draft)
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
Ultrasonics - Focusing transducers - Definitions and measurement methods for the transmitted fields (IEC 87/573/CD:2015)
Hardcopy , PDF
German, German - English
01-02-2016
26-11-2022
INTRODUCTION
1 Scope
2 Normative references
3 General
3.1 Focusing methods
3.2 System and measurement requirements
3.3 General focused field descriptions
4 Focusing definitions
4.1 Background information
4.2 Definitions
5 List of symbols
6 Measurement procedures
6.1 General
6.2 Finding the beam axis
6.3 Determining if transducer is focusing
6.4 Measuring other focal parameters of a focusing transducer
Annex A (informative) Background for the transmission/Characteristics
of focusing transducers
Annex B (informative) Methods for determining the beam axis for
well-behaved beams
B.1 Comparisons of beam axis search methods
B.2 Beamwidth midpoint method
Annex C (informative) Methods for determining the beam axis for beams
that are not well-behaved
Annex ZA (normative) Normative references to international publications
with their corresponding European publications
Figure 1 - Transducer options - Top: Transducer with a radius of
curvature R and a focal length equal to R - Middle:
Transducer with a plano-concave lens - Bottom: Transducer
with a plano-convex lens
Figure 2 - Definitions for focusing measurements when the transducer
geometry is unknown
Figure 3 - Field parameters for non-focusing and focusing transducers
Figure 4 - Beam contour plot - Contours at -6, -12, and -20 dB for
a 5 MHz transducer with a diameter of 25 mm and a radius
of curvature of 50 mm centred at location 0,0 (bottom
centre of graph)
Figure 5 - Parameters for describing a focusing transducer of a known
geometry
Figure 6 - Path difference parameters for describing a focusing
transducer of a known geometry
Figure 7 - Beamwidth focus in a principal longitudinal plane
Figure 8 - Types of geometric focusing
Figure 9 - Pressure focus in a principal longitudinal plane
Figure B.1 - X-axis scan at 9 cm depth for the first focal zone with
beam centre
Figure B.2 - X-axis scan at 4,4 cm depth for the second focal zone
Figure C.1 - Asymmetric beam showing beamwidth midpoint method
Table B.1 - Standard deviations for x and y scans using three
methods of determining the centre of the beam
Table B.2 - -dB beamwidth levels for determining midpoints
Specifies the definitions for the transmitted field characteristics of focusing transducers for applications in medical ultrasound.
| DevelopmentNote |
DRAFT 2016 issued in February 2016. (02/2016)
|
| DocumentType |
Draft
|
| Pages |
105
|
| PublisherName |
German Institute for Standardisation (Deutsches Institut für Normung)
|
| Status |
Superseded
|
| SupersededBy |
| Standards | Relationship |
| NF EN 61828 : 2006 | Identical |
| IEC 61828:2001 | Identical |
| NBN EN 61828 : 2002 | Identical |
| I.S. EN 61828:2001 | Identical |
| BS EN 61828:2002 | Identical |
| EN 61828:2001 | Identical |
| UNE-EN 61828:2003 | Identical |
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