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Ultrasonic diffraction tomography by pulse-plane wave: experimental result by frequency synthesis method.

G Tangtisanon¹, K Jaruwongrunsee, W Withayachumnankul

¹Dept. of Electr. Eng., Tokai Univ., Kanagawa.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference

|February 7, 2007

Summary

Diffraction tomography offers quantitative ultrasonic imaging. A novel frequency synthesis method (FSM) improves Fourier space filling, yielding promising results for medical applications.

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Area of Science:

Acoustics
Medical Imaging
Wave Physics

Background:

Diffraction tomography maps object parameters (e.g., refractive index, sound velocity) using scattered acoustic waves.
The generalized Fourier slice theorem, derived from Born or Rytov approximations, reconstructs object cross-sections.
Current medical applications of diffraction tomography are limited by hardware complexity.

Purpose of the Study:

Investigate the potential of diffraction tomography for medical imaging.
Develop and validate a frequency synthesis method (FSM) to enhance image reconstruction.

Main Methods:

Utilized a specifically designed ultrasonic computerized tomographic system.
Employed a frequency synthesis method (FSM) using three frequency components (center and -3 dB points) of the scattered field's Fourier transform.
Applied the generalized Fourier slice theorem for image reconstruction.

Main Results:

The frequency synthesis method effectively filled Fourier space for the generalized Fourier slice theorem.
Reconstructed ultrasonic images demonstrated highly promising results.

Conclusions:

The proposed frequency synthesis method shows significant potential for advancing diffraction tomography in medical applications.
This technique offers a promising avenue for developing more practical and effective ultrasonic medical imaging systems.