Figure - PMC

Skip to main content

View full-text article in PMC

. Author manuscript; available in PMC: 2019 Nov 1.

Published in final edited form as: Ultrasound Med Biol. 2018 Aug 7;44(11):2358–2370. doi: 10.1016/j.ultrasmedbio.2018.05.013

Variance of power spectrum estimates among eleven 6C1 transducers (solid line; Eq. (6)), five Acuson S3000 systems (dash-dot line; Eq. (5)), and the theoretical speckle variance (horizontal dashed line; $\frac{{4.34}^{2}}{N}$ ) obtained with (a) 150 uncorrelated A-lines and (b) 750 uncorrelated A-lines. The peaks cut off near 5 MHz reach a height of: (a) 2.05 dB² and (b) 2.40 dB² respectively. The peak cut off near 1.4 MHz reaches a height of: (a) 1.16 dB².

Variance of power spectrum estimates among eleven 6C1 transducers (solid line; Eq. (6)), five Acuson S3000 systems (dash-dot line; Eq. (5)), and the theoretical speckle variance (horizontal dashed line; $\frac{{4.34}^{2}}{N}$ ) obtained with (a) 150 uncorrelated A-lines and (b) 750 uncorrelated A-lines. The peaks cut off near 5 MHz reach a height of: (a) 2.05 dB² and (b) 2.40 dB² respectively. The peak cut off near 1.4 MHz reaches a height of: (a) 1.16 dB².