3D FFT Mode Filtering for Phase Gradient Velocity Measurements
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
Palpation is a diagnostic tool that is commonly used by physicians to assess the elasticity of tissues. A medical imaging technique capable of quantitatively mapping tissue elasticity is of clinical interest because disease can affect the elastic properties of tissue [1]. Magnetic Resonance Elastography (MRE) [2, 3] is currently being developed to quantitatively image the elastic properties of tissue. MRE measures the displacements caused by a shear wave propagating within tissue. From the MRE displacement data, the propagation characteristics of the shear wave are determined and used to quantify elastic properties of the tissue. The MRE technique has three components: methods for generating acoustic shear waves, magnetic resonance imaging sequences capable of imaging cyclic displacements, and image processing techniques to determine phase velocity. The focus of this work has been to develop robust image processing techniques that will accurately relate measured shear velocity to tissue elasticity.