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By C. B Colby

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Ultrasonic Evaluation of Deeply Located Trabecular Bones – Preliminary Results b Amplitude a 47 62 64 66 68 t [µs] Fig. 1 (a) Scanner probe. 5 MHz The choice of the frequency range was a trade-off between the bone attenuation and the size of the transducer (15 mm diameter) and its backing damping. Transmitted signal duration and its shape is programmable. 5 MHz sine pulse is presented in Fig. 1b. 41. The scanner acquires backscattered RF data. The received sequences are online envelope detected, sampled at 20 MHz frequency and displayed as B-mode image.

4 the axial profiles at x ¼ 6:6 mm Fig. 4a and the lateral profiles at z ¼ 44 mm Fig. 4b taken from each image of Fig. 3 are shown. The black solid curves show the profiles achieved with the proposed tomographic reconstruction. The gray dashed curves indicate the profiles obtained with the delay-and-sum algorithm. According to the chosen profiles in Fig. 4 both approaches yield virtually identical À6 dB-widths in axial and lateral direction (260 mm and 457 mm, respectively). However, as can be seen in Fig.

The color scale represents the strain percentage 4 Conclusion The HFR averaging method for elastography purpose has been reported. The results show that when the elastograms frame rate is appropriate with respect to the speed of compression, the averaging does not introduce significant improvements. However, in all other cases averaging is demonstrated to significantly increase the quality of elastograms, whatever is the displacement estimation algorithm. The effect of averaging is to increase the signal-to-noise ratio of elastography images.

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