Abstract
The anisotropy of frequency dependent backscatter coefficient, attenuation, and speed of sound is assessed in fresh rat skeletal muscle within 5 hours post mortem. Excised rat semimembranosus and soleus muscles are measured in 37 °C Tyrode solution, with the muscle fibers at 90° and 45° orientations to the incident sound beam. Reflected and through transmission signals from either a 6 or 10 MHz focussed transducer give frequency dependent information in the 4-14 MHz range. The attenuation coefficient in each muscle is consistently 60±25% lower for propagation perpendicular to the fibers than at 45°, whereas speed of sound shows a much milder anisotropy (slightly faster for the 90° orientation) which is inconclusive within experimental error. The largest anisotropy is seen in the backscatter coefficient, most notably in the semimembranosus where the magnitude at 90° is over an order of magnitude greater than at 45°, with the frequency dependence in both cases giving a power law close to 2.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1369-1372 |
| 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