Ultrasound characterization of 3-dimensional flaws

Details Ultrasound characterization of 3-dimensional flaws Ultrasound characterization of 3-dimensional flaws

1988-08-15

1989-09-12

Lall, Parshotam S.

Boots, shoes, and leggings

364507, 36455101, 12866001, 12866007, 12866006, 73600, 73602, G06F 1542, G01N 2904

Patent

active

048666149

ABSTRACT:
This ultrasound imspection method using the Born approximation simplifies the problem of characterizing 3-dimensional flaws of general shape by reducing it to a series of 2-dimensional tomographic image reconstructions. The reconstructed 2-dimensional images represent the 2-dimensional projections or shadows of the 3-dimensional flaw characteristic function which specifies the shape of the flaw. Each projection image is reconstructed independently using well developed computerized tomography techniques. If the shape of the flow is not too irregular or fine details are not of interest, only a few of these projection images are needed. The 3-dimensional flaw shape is reconstructed from the 2-dimensional projection images through a 3-D reconstruction process.

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Rose et al., "Determination of Flaw Characteristics for Ultrasonic Scattering Data", J. Appl. Phys., 50(4), Apr. 1979, pp. 2951-2952.
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Tam et al., "Tomographical Imaging with Limited-Angle Input", J. Opt. Soc. Am. 71, May 1981, pp. 582-592.

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