A method for generating permeability elastograms and Poisson's ratio time-constant elastograms.
The feasibility of imaging the permeability and Poisson's ratio time-constant of porous media was investigated. The study involved the following steps. First, poroelastograms were generated from porous tofu phantoms under sustained compression. The sample materials used for the experiments were previously characterized through independent mechanical measurements. Second, corresponding Poisson's ratio time-constant elastograms were generated by calculating and displaying the decay time-constants of the local Poisson's ratios over the time interval in which the poroelastograms were acquired. Finally, for homogeneous samples, permeability elastograms were generated using the poroelastograms in combination with a previously proposed biphasic theoretical model, under very specific conditions. A comparison between the results obtained using poroelastography and those obtained through independent mechanical measurements suggests that poroelastography may be used for imaging the local time-dependent behavior of poroelastic media.
Righetti
Raffaella
R
Department of Radiology, Ultrasonics Laboratory, The University of Texas Medical School, Houston, TX 77030, USA.
Ophir
Jonathan
J
Krouskop
Thomas A
TA
D003198:Computer Simulation; D004548:Elasticity; D006801:Humans; D008954:Models, Biological; D010539:Permeability; D019047:Phantoms, Imaging; D016012:Poisson Distribution; D013314:Stress, Mechanical; D013997:Time Factors; D014463:Ultrasonography