Abstract
The first computed ultrasonographic tomograms (CT) were produced in 1973 [1]. Since then, considerable ingenuity has been demonstrated by many researchers in implementing a wide variety of CT imaging techniques. These techniques can be divided into two broad categories. One category of methods is based on the straight-ray approximation for either transmission or reflection measurements. Because the straight-ray approximation is used, the measurements are regarded as projections or shadows. The second category of methods results from attempts to take diffraction into account by mathematically inverting an approximate wave equation. It is known as diffraction tomography and is discussed later.
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© 1992 Mayo Foundation
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Greenleaf, J.F., Sehgal, C.M. (1992). Computed Transverse Imaging. In: Biologic System Evaluation with Ultrasound. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-9243-9_8
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DOI: https://doi.org/10.1007/978-1-4613-9243-9_8
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