scholarly journals Effects of acoustic nonlinearities on the ultrasonic backscatter coefficient estimation

2019 ◽  
Vol 146 (1) ◽  
pp. 85-94 ◽  
Author(s):  
Andres Coila ◽  
Michael L. Oelze
Keyword(s):  
Backscatter Coefficient ◽  
Coefficient Estimation ◽  
Ultrasonic Backscatter

scholarly journals A Combined Ultrasonic Backscatter Parameter for Bone Status Evaluation in Neonates

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Weiying Mao ◽  
Yang Du ◽  
Chengcheng Liu ◽  
Boyi Li ◽  
Dean Ta ◽  
...  
Keyword(s):  
Gestational Age ◽  
Bone Health ◽  
Biochemical Markers ◽  
Age Groups ◽  
Backscatter Coefficient ◽  
Anthropometric Indices ◽  
Term Infants ◽  
Bone Status ◽  
Centroid Shift ◽  
Ultrasonic Backscatter

Metabolic bone disease (MBD) is one of the major complications of prematurity. Ultrasonic backscatter technique has the potential to be a portable and noninvasive method for early diagnosis of MBD. This study firstly applied CAS to neonates, which was defined as a linear combination of the apparent integrated backscatter coefficient (AIB) and spectral centroid shift (SCS). The objective was to evaluate the feasibility of ultrasonic backscatter technique for assessing neonatal bone health using AIB, SCS, and CAS. Ultrasonic backscatter measurements at 3.5 MHz, 5.0 MHz, and 7.5 MHz were performed on a total of 505 newborns within 48 hours after birth. The values of backscatter parameters were calculated and compared among gestational age groups. Correlations between backscatter parameters, gestational age, anthropometric indices, and biochemical markers were analyzed. The optimal predicting models for CAS were determined. The results showed term infants had lower SCS and higher AIB and CAS than preterm infants. Gestational age and anthropometric indices were negatively correlated with SCS (|r| = 0.45 – 0.57, P < 0.001), and positively correlated with AIB (|r| = 0.36 – 0.60, P < 0.001) and CAS (|r| = 0.56 – 0.69, P < 0.001). Biochemical markers yielded weak or nonsignificant correlations with backscatter parameters. CAS had relatively stronger correlations with the neonatal variables than AIB and SCS. At 3.5 MHz and 5.0 MHz, only gestational age (P < 0.001) independently contributed to the measurements of CAS, and could explain up to 40.5% – 44.3% of CAS variation. At 7.5 MHz, the combination of gestational age (P < 0.001), head circumference (P = 0.002), and serum calcium (P = 0.037) explained up to 40.3% of CAS variation. This study suggested ultrasonic backscatter technique was feasible to evaluate neonatal bone status. CAS was a promising parameter to provide more information about bone health than AIB or SCS alone.

Comparison of ultrasonic backscatter coefficient estimates from rat mammary tumors using single element and array transducers.

2009 ◽  
Vol 126 (4) ◽  
pp. 2213 ◽  
Author(s):  
Lauren A. Wirtzfeld ◽  
Goutam Ghoshal ◽  
Zachary T. Hafez ◽  
Rita J. Miller ◽  
Sandhya Sarwate ◽  
...  
Keyword(s):  
Mammary Tumors ◽  
Single Element ◽  
Coefficient Estimates ◽  
Backscatter Coefficient ◽  
Ultrasonic Backscatter

scholarly journals Interlaboratory Comparison of Ultrasonic Backscatter Coefficient Measurements From 2 to 9 MHz

2005 ◽  
Vol 24 (9) ◽  
pp. 1235-1250 ◽  
Author(s):  
Keith A. Wear ◽  
Timothy A. Stiles ◽  
Gary R. Frank ◽  
Ernest L. Madsen ◽  
Francis Cheng ◽  
...  
Keyword(s):  
Interlaboratory Comparison ◽  
Backscatter Coefficient ◽  
Ultrasonic Backscatter

Analysis of frequency dependence of ultrasonic backscatter coefficient in cancellous bone

2008 ◽  
Vol 124 (6) ◽  
pp. 4083-4090 ◽  
Author(s):  
Dean Ta ◽  
Weiqi Wang ◽  
Kai Huang ◽  
Yuanyuan Wang ◽  
Lawrence H. Le
Keyword(s):  
Frequency Dependence ◽  
Cancellous Bone ◽  
Backscatter Coefficient ◽  
Ultrasonic Backscatter

Inter‐comparison of ultrasonic backscatter coefficient measurements of live rat fibroadenomas across multiple imaging platforms.

2010 ◽  
Vol 127 (3) ◽  
pp. 1731-1731
Author(s):  
Lauren A. Wirtzfeld ◽  
Goutam Ghoshal ◽  
Zachary T. Hafez ◽  
Kibo Nam ◽  
Yassin Labyed ◽  
...  
Keyword(s):  
Backscatter Coefficient ◽  
Multiple Imaging ◽  
Ultrasonic Backscatter
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