Processing algorithms for tracking speckle shifts in optical elastography of biological tissues.
Parametric and nonparametric data processing schemes for analyzing translating laser speckle data used to investigate the mechanical behavior of biological tissues are examined. Cross-correlation, minimum mean square estimator, maximum likelihood, and maximum entropy approaches are discussed and compared on speckle data derived from cortical bone samples undergoing dynamic loading. While it was not the purpose of this paper to demonstrate that one processing technique is superior to another, maximum likelihood and maximum entropy approaches are shown to be particularly useful when the observed speckle motion is small.
Duncan
D D
DD
Applied Physics Laboratory, The Johns Hopkins University, 11100 Johns Hopkins Road, Laurel, MD 20723-6099, USA.
Kirkpatrick
S J
SJ
D000465:Algorithms; D000818:Animals; D004547:Elastic Tissue / Q000737:chemistry*; D019277:Entropy; D006801:Humans; D007834:Lasers; D016013:Likelihood Functions; D008954:Models, Biological