Abstract
The purpose of this contribution is to estimate the temperature increase for transabdominal obstetrical exposures. The monopole-source solution was used to calculate the 3D complex acoustic pressure field for focused circular apertures from which the 3D temperature distribution was calculated using the bio-heat transfer equation in a layered, perfused media. For the 114 cases, the acoustic field was normalized to the transmit acoustic power required for the derated spatial peak, temporal average intensity ISPTA.3 equal to 720 mW/cm2 for the applicable homogeneous tissue model, the maximum value allowed by the FDA 510(k) diagnostic ultrasound equipment approval process. For the ISPTA.3 = 720 mW/cm2 condition, the axial temperature increase profiles and maximum temperature increases were determined within the anterior abdominal wall and conceptus. Also, from the normalized acoustic field, the soft-tissue thermal index TIS was determined according to the procedures of the Output Display Standard. The results suggest that the TIS is an adequate indicator for monitoring the myometrium's, and possibly the fetus', maximum temperature increase.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1405-1408 |
| Number of pages | 4 |
| Journal | Proceedings of the IEEE Ultrasonics Symposium |
| Volume | 2 |
| State | Published - 1998 |
| Event | Proceedings of the 1998 International Ultrasonics Symposium - Sendai, Miyagi, Jpn Duration: Oct 5 1998 → Oct 8 1998 |
ASJC Scopus subject areas
- Acoustics and Ultrasonics