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    Comparison study of ultrasonic diffraction tomography and ultrasonic non-diffraction tomography
    (2007-01-01)
    Onemanisone, Thongsamlith
    ;
    Pintavirooj, C.
    ;
    Jaruwongrungsee, K.
    ;
    Sangworasil, Manas
    Diffraction tomography is a technique for imaging with acoustic fields in which parameter, such as reflective index, sound velocity, etc., can be mapped from scatter wave resulting from insonifying the object with a plane wave at a single temporal frequency. By solving the direct scattering problem, the scattered field can be presented in term of scattering parameters. Different inversion techniques can be applied to takes advantage of the linearization process of the nonlinear wave equation describing wave propagation in heterogeneous media under for limited class of scattering. Specifically, when the scattering effect is weak, one can invoke the Born or Rytov approximation and thus derive the generalized Fourier Slice Theorem to reconstruct the cross-section of the insonified object. The objective of this paper is to compare the quality of the reconstructed image derived from diffraction tomography and non-diffraction tomography.
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    Ultrasonic diffraction tomography: The experimental result
    (2005-12-01)
    Pintavirooj, C.
    ;
    Jaruwongrungsee, K.
    ;
    Withayachumnankul, W.
    ;
    Hamamoto, K.
    ;
    Daochai, S.
    Diffraction tomography is a technique for imaging with acoustic fields. It takes advantage of the linearization process of the non-linear wave equation describing wave propagation in heterogeneous media. When the scattering effect is weak, one can invoke the Born or Rytov approximation and thus derive the generalized Fourier Slice Theorem to reconstruct the cross-section of the insonified object. Although diffraction tomography is a promising technology for medical application as it provides a quantitative ultrasonic image, its realization toward medical use is still far-to-go, this may be due to the complexity of the hardware involved. In this research we investigate a potential use of diffraction tomography for medical application by using a delicate-designed ultrasonic computerized tomographic system. The result of experiment investigation of diffraction tomography is very promising. Copyright UNION Agency - Science Press.