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Inverse ultrasonic scattering with model function constraints

Boada, Fernando E.
http://rave.ohiolink.edu/etdc/view?acc_num=case1054586314

Abstract Details

1990, Doctor of Philosophy, Case Western Reserve University, Biomedical Engineering.
This dissertation discusses the problem of optimally reconstructing a soft acoustic scattering potential using inverse scattering techniques when the reflection coefficient data is incomplete or with low signal-to-noise ratio. As it has been noticed in the past, inverse scattering techniques can help overcome the finite spatial size resolution barrier of conventional ultrasonic imaging. However, in practical experimental conditions the reflection coefficient data is bandlimited and noisy. Under these circumstances the quality of the results obtained through the use of the standard inverse scattering techniques is far from satisfactory. A new parametric approach based on local polynomial approximations to the scattering target is introduced. Its lower level formulation, which corresponds to a layered medium, is studied in particular detail in both the non-lossy and lossy case, since it can be easily applied in a number of different scenarios after minor modifications. For calculations performed with calculated and experimental data it was found that this technique yields superior results when compared to the standard spectral inversion techniques, provided the scattering target can be well represented by the model constraint. Otherwise a compromise between resolution and noise is found. Further improvements of the technique as well as applications to other related fields are also discussed.
E. Haacke (Advisor)
157 p.
Inverse ultrasonic scattering model function constraints

Recommended Citations

Citations

  • Boada, F. E. (1990). Inverse ultrasonic scattering with model function constraints [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1054586314

    APA Style (7th edition)

  • Boada, Fernando. Inverse ultrasonic scattering with model function constraints. 1990. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1054586314.

    MLA Style (8th edition)

  • Boada, Fernando. "Inverse ultrasonic scattering with model function constraints." Doctoral dissertation, Case Western Reserve University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=case1054586314

    Chicago Manual of Style (17th edition)

case1054586314
491
© 1990, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.