Table 1 Porcine muscle.
| Probe | Linear | Convex | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Frequency | 9 MHz | 2.5 MHz | 6 MHz | |||||||
| Fiber Direction | Longitudinal | Cross-section | Longitudinal | Cross-section | Longitudinal | |||||
| Insertion depth (cm) | SWV (m/s) | CV | SWV (m/s) | CV | SWV (m/s) | CV | SWV (m/s) | CV | SWV (m/s) | CV |
| 0 | n.m. | n.m. | n.m. | n.m. | 1.89 | 8% | 1.75 | 16% | 1.60 § | 15% |
| 1 | 4.56 | 1% | 3.42° | 1% | 2.17 | 7% | 1.87° | 13% | 2.18 | 13% |
| 2 | 3.68 | 3% | 3.02° | 8% | 2.67 | 5% | 2.47 | 11% | 2.55 § | 4% |
| 3 | 2.48 | 8% | 1.99° | 28% | 2.74 | 5% | 2.75 | 18% | 2.81 | 8% |
| 4 | 1.81* | 34% | 1.34* | 19% | 2.35 | 5% | 2.60° | 6% | 2.31 | 9% |
| 5 | n.m. | n.m. | n.m. | n.m. | 2.22 | 4% | 2.55° | 5% | 2.24 | 13% |
| 6 | n.m. | n.m. | n.m. | n.m. | 1.91 | 103% | 2.04 | 11% | 1.95 | 19% |
| Mean | 3.13* | 2.44*° | 2.28 | 2.29 | 2.23 | |||||
Mean shear wave velocities (SWV) and coefficient of variation (CV) at different insertion depths, probes, probe frequencies and fiber orientations. n.m.=measurement failed. *= mean includes misfiring with less than twelve, but six or more successful measurements. °=significant mean difference of longitudinal and cross-section fiber directions. § =significant mean difference of convex probe operating at 2.5 MHz vs. 6 MHz