Non-Contact Ultrasonic Tomography Imaging Using Air-Coupled Capacitance Transducers
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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.
Tomographic reconstruction  is a method of imaging by illuminating the object in many different directions in the plane of interest, using X-rays or ultrasound. An image is formed from changes in a physical variable occurring in the planar cross section. Typically, changes in propagation delay or arrival time are used to reconstruct an image of the slowness variations (where slowness is the inverse of velocity), or changes in signal amplitude are used to produce an attenuation image.