| Zugriffsnummer | 23217 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Output beam characterization of medical diagnostic ultrasound systems using a thermal technique for intensity measurements |
| Autor(in); Institution |
Wilkens, Volker; 1.6, Schall, PTB-Braunschweig
|
| Quelle/Jahr | NAG/DAGA 2009 : International Conference on Acoustics, Rotterdam, 23 - 26 March 2009 ; proceedings:(2009), 317 - 320 |
| Availability | [CD-ROM] ; file name:data\\articles\\000122.pdf |
| Herausgeber(in) |
Boone, Marinus M.
|
| ISBN | 978-3-9808659-6-8 |
| Verlag | Berlin: DEGA |
| Konferenzangaben | International Conference on Acoustics, NAG/DAGA 2009, Rotterdam, 23-26, March, 2009, The Netherlands |
| Klassifikationscode | PACS: 43.35.+d ; PACS: 43.58.+z ; PACS: 43.38.+n |
| Zusammenfassung | Ultrasound exposure measurements for medical ultrasound systems are essential as regards aspects of safety and quality assurance. International standards require the characterization of output beams regarding, for instance, power, intensity, peak pressure, and lateral dimension. Spatial-peak temporal-average intensities are particularly important since they are related to thermal hazard for the patient. Commonly, local intensity parameters are derived from hydrophone measurements. Alternatively, a simple and low-cost thermal intensity sensor technique recently developed at PTB can be applied to precise ultrasound time-averaged intensity determination. The applicability of these sensors is demonstrated by extensive exposure measurements on a representative diagnostic ultrasound system. Output beams of different operation modes and working frequencies are characterized by line scans along the beam axis and by beam profile measurements. For non-scanning modes of the diagnostic device, these results are compared with additional hydrophone-based intensity measurements. With respect to typical uncertainties of intensity parameters within the range of 20% to 30%, the agreement is very good. However, the advantages of the thermal sensor technique are especially evident for intensity measurements in the case of scanning and combined modes of the diagnostic device, where the synchronization between hydrophone measurements and the complex pulse emission pattern is difficult. |
