Ultrasound elastography: a dynamic programming approach.
This paper introduces a 2-D strain imaging technique based on minimizing a cost function using dynamic programming (DP). The cost function incorporates similarity of echo amplitudes and displacement continuity. Since tissue deformations are smooth, the incorporation of the smoothness into the cost function results in reduced decorrelation noise. As a result, the method generates high-quality strain images of freehand palpation elastography with up to 10% compression, showing that the method is more robust to signal decorrelation (caused by scatterer motion in high axial compression and nonaxial motions of the probe) in comparison to the standard correlation techniques. The method operates in less than 1 s and is thus also potentially suitable for real time elastography.
Rivaz
Hassan
H
Engineering Research Center for Computer Integrated Surgery, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA.
Boctor
Emad
E
Foroughi
Pezhman
P
Zellars
Richard
R
Fichtinger
Gabor
G
Hager
Gregory
G
D000465:Algorithms; D054459:Elasticity Imaging Techniques / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D009716:Numerical Analysis, Computer-Assisted; D019047:Phantoms, Imaging; D012680:Sensitivity and Specificity