Abstract
For Quantitative Nondestructive Evaluation with ultrasound, a new approach to ultrasonic image reconstruction has been proposed and compared with Synthetic Aperture Focusing Technique (SAFT) and Wiener filtering in terms of the spatial resolution and the image quality of defects. The new approach, whose algorithm was based on depth-invariant defect image of SAFT results, was better in the spatial resolution than SAFT and comparable to Wiener filtering. And it's more useful in ultrasonic NDE applications than Wiener filtering because of requiring only one point spread function (PSF), while in Wiener filtering signals from defects having different depths must be restored with different PSFs. A disadvantage of this technique was that the reconstructed image has a relatively lower image quality, which may cause incorrect evaluation of defects.
