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Two-dimensional ultrasonic tomography in nondestructive evaluation by using area functions.

L S Koo¹, H R Shafiee, D K Hsu

¹Center for NDE, Iowa State Univ., Ames, IA.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 1, 1990

Summary

This study connects ultrasonic scattering to X-ray CT imaging using an area function. This allows for efficient reconstruction of ultrasonic scatterer thickness using X-ray CT algorithms.

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Area of Science:

Non-destructive testing
Medical imaging
Materials science

Background:

X-ray CT (computerized tomography) is a widely used imaging technique.
Ultrasonic scattering provides information about material properties.
Integrating ultrasonic data into X-ray CT offers potential for enhanced imaging.

Purpose of the Study:

To develop and demonstrate an imaging methodology that combines ultrasonic scattering response with X-ray CT.
To reproduce the vertical thickness function of ultrasonic scatterers.
To validate the method using theoretical and experimental data.

Main Methods:

Utilizing the normalized area function derived from the Born approximation.
Applying ultrasonic signals within a parallel-beam X-ray CT algorithm.
Employing a filtered backprojection algorithm for image reconstruction.

Main Results:

The area function provides a direct link between ultrasonic scattering and X-ray CT monochromatic ray sum.
Vertical thickness function images were successfully reconstructed for model scatterers (spheroid, cylinder).
The method showed excellent agreement with true thickness functions for theoretical data and satisfactory results for experimental data.

Conclusions:

The developed imaging technique effectively reconstructs the vertical thickness function of ultrasonic scatterers.
This approach offers a computationally efficient method for combining ultrasonic and X-ray CT data.
The methodology shows promise for imaging objects with smooth surfaces, even with complex scattering phenomena like creeping waves.