PURPOSE The purpose of this study was to use noncontact optical coherence elastography (OCE) to evaluate and compare changes in biomechanical properties that occurred in rabbit cornea in situ after corneal collagen cross-linking by either of two techniques: ultraviolet-A (UV-A)/riboflavin or rose-Bengal/green light. METHODS Low-amplitude (≤10 μm) elastic waves were induced in mature rabbit co...

BACKGROUND It is known that subjective contours are perceived even when a figure involves motion. However, whether this includes the perception of rigidity or deformation of an illusory surface remains unknown. In particular, since most visual stimuli used in previous studies were generated in order to induce illusory rigid objects, the potential perception of material properties such as rigidi...

This study has been motivated by the observed difference in the range of the power-law attenuation exponent for compressional and shear waves. Usually compressional attenuation increases with frequency to a power between 1 and 2, while shear wave attenuation often is described with powers less than 1. Another motivation is the apparent lack of partial differential equations with desirable prope...

Co-Authors: Eliot Siegel

The past several years have seen rapid innovation in imaging techniques, with both hardware and software changes. These changes have occurred in all modalities, including the development of multichannel CT scanners with lowradiation dose scanning protocols and reconstruction algorithms, ultrasound elastography, parallel transmit and receive MR coils, and the widespread implementation of 3-T fie...

Introduction This paper presents initial experience with a new Toshiba elastography imaging system used to detect prostate cancer. Since this is a preliminary evaluation, the elastography imaging procedure was performed in addition to our standard procedure of ten systematic biopsies, plus extra biopsies of suspicious areas where appropriate. The elastography images did not influence the biopsy...

Context: This thesis is motivated by the development of elastography technique [6]. This is a medical imaging procedure that measures ultrasonic wave propagation inside a biological tissue and aims at identifying the physical properties of the tissue. These properties are of major importance in many medical applications. For instance, it enables the reproduction of the quantitative palpation of...

This paper presents a semi-analytical model of shear wave scattering by a viscoelastic elliptical structure embedded in a viscoelastic medium, and its application in the context of dynamic elastography imaging. The commonly used assumption of mechanical homogeneity in the inversion process is removed introducing a priori geometrical information to model physical interactions of plane shear wave...