. Author manuscript; available in PMC: 2014 Mar 1.

Published in final edited form as: Ultrasonics. 2012 Nov 16;53(3):727–738. doi: 10.1016/j.ultras.2012.10.017

Table 1.

The mean and standard deviation evaluated for each ultrasonic parameter at different components of atherosclerotic plaques including calcification, fibrosis, and lipid pool using n regions of interest matched with histology. Ultrasonic parameters include time integrated backscatter (T_IB), time variance (T_var), time entropy (T_E), frequency integrated backscatter (F_IB), wavelet RMS (W_rms), and wavelet integrated backscatter (W_IB).

Histology	Parameter mean ± 1 SD (dB)
	T_IB	T_var	T_E	F_IB	W_rms	W_IB
Calcification (n = 6)	−13.2 ± 9.4	−16.3 ± 13.9	−14.8 ± 8.8	−10.1 ± 7.4	−8.6 ± 5.2	−14.2 ± 9.4
Fibrosis (n = 13)	−32.5 ± 15.2	−31.2 ± 10.1	−26.7 ± 11.4	−20.0 ± 8.3	−18.5 ± 7.4	−31.3 ± 13.9
Lipid pool (n = 8)	−42.4 ± 3.5	−45.0 ± 3.0	−33.0 ± 4.7	−21.5 ± 1.8	−20.3 ± 2.2	−35.8 ± 5.2