| Zugriffsnummer | 25544 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | A thermal technique for local ultrasound intensity measurement: part 2. Application to exposimetry on a medical diagnostic device |
| Autor(in); Institution |
Wilkens, Volker; 1.6, Schall, PTB-Braunschweig
|
| Quelle/Jahr | Measurement Science and Technology: 21 (2010), 11, 115806-1 - 115806-10 |
| ISSN | 0957-0233 (PRINT) ; 1361-6501 (ONLINE) |
| DOI | |
| URL | |
| Verlag | Bristol: IOP Publishing |
| Klassifikationscode | PACS: 87.63.-d ; PACS: 43.80.Qf ; PACS: 43.80.Vj ; PACS: 87.19.Pp |
| Freie Schlagworte | ultrasound exposimetry ; diagnostic ultrasound ; thermal sensor |
| Zusammenfassung | Acoustic output measurements on medical ultrasound equipment are usually performed using radiation force balances to determine the output power and using hydrophones to determine pressure and intensity parameters. The local temporal-average ultrasound intensity can be measured alternatively by thermal sensors. The technique was described and prototype sensors were characterized in a preceding paper. Here, the application of such a thermal intensity sensor to the output beam characterization of a typical medical diagnostic device is described. Two transducers, a 7.5 MHz linear array and a 3.5 MHz convex array were investigated in different operating modes. For comparison, hydrophone measurements were also performed. If the spatial averaging effect is taken into account, good agreement is found between both measurement methods. The maximum deviations of the spatial-peak temporal-average intensities ISPTA obtained with the thermal sensor from the corresponding hydrophone-based results were below 12%. The simple thermal technique offers advantages for intensity measurements especially in the case of scanning and combined modes of the diagnostic device, where the synchronization between hydrophone measurements and the complex pulse emission pattern can be difficult. |
