BS EN 61391-2:2010
$167.15
Ultrasonics. Pulse-echo scanners – Measurement of maximum depth of penetration and local dynamic range
| Published By | Publication Date | Number of Pages |
| BSI | 2010 | 42 |
IEC 61391-2:2010 defines terms and specifies methods for measuring the maximum depth of penetration and the local dynamic range of real time ultrasound B MODE scanners. The types of transducers used with these scanners include: – mechanical probes; – electronic phased arrays; – linear arrays; – curved arrays; – two-dimensional arrays; – three-dimensional scanning probes based on a combination of the above types. All scanners considered are based on pulse-echo techniques. The test methodology is applicable for transducers operating in the 1 MHz to 15 MHz frequency range operating both in fundamental mode and in harmonic modes that extend to 15 MHz. However, testing of harmonic modes above 15 MHz is not covered by this standard.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | CONTENTS |
| 8 | INTRODUCTION |
| 10 | 1 Scope 2 Normative references 3 Terms and definitions |
| 15 | 4 General requirement 5 Environmental conditions |
| 16 | 6 Equipment and data required 6.1 General 6.2 Phantoms |
| 17 | 6.3 Test equipment for measuring local dynamic range |
| 18 | Figures Figure 1 – Arrangement for measuring local dynamic range using an acoustic-signal injection technique |
| 19 | 6.4 Digitized image data Figure 2 – Arrangement for measuring local dynamic range using an acoustically-coupled burst generator |
| 21 | 7 Measurement methods 7.1 System sensitivity: maximum depth of penetration |
| 22 | Figure 3 – Image of the penetration phantom |
| 23 | Figure 4 – Mean digitized image data value vs. depth for the phantom image data (A(j)) and for the noise image data (A'(j)) |
| 24 | 7.2 Local dynamic range |
| 25 | Figure 5 – Digitized-image data vs. attenuator setting during local dynamic range measurements using acoustic signal injection |
| 26 | Figure 6 – Image of phantom with inclusions (circles) |
| 27 | Figure 7 – Ensemble-average mean pixel value vs. backscatter contrast of inclusions |
| 28 | Annex A (informative) Phantom for Determining Maximum Depth of Penetration Figure A.1 – Phantom for maximum depth of penetration tests |
| 30 | Annex B (informative) Local dynamic range using acoustical test objects |
| 31 | Figure B.1 – Possible arrangement of reflectors for determining local dynamic range |
| 32 | Figure B.2 – Displayed intensity (or image pixel value) vs. reflector reflection coefficient |
| 34 | Figure B.3 – Flat ended wire test object for determining local dynamic range |
| 35 | Figure B.4 – The experimentally observed backscattering cross section of flat-ended stainless-steel wires as a function of diameter for three frequencies: 9.6 MHz; 4.8 MHz; 2.4 MHz [33] |
| 37 | Bibliography |
