New PDF release: Computed tomography. Principles, design, artifacts, and

By Jiang Hsieh

ISBN-10: 0819475335

ISBN-13: 9780819475336

Six years after its first variation, Computed Tomography: rules, layout, Artifacts, and up to date Advances, moment Edition offers and up to date evaluation of the evolution of CT, the mathematical and actual elements of the know-how, and the basics of photo reconstruction algorithms. Given the excessive visibility and public understanding of the influence of x-ray radiation, the second one version incorporates a new bankruptcy on x-ray dose and provides assorted dose relief suggestions starting from sufferer dealing with, optimum info acquisition, photo reconstruction, and postprocess. according to the developments over the last six years, the second one variation contains new sections on cone beam reconstruction algorithms, nonconventional helical acquisition and reconstruction, new reconstruction methods, and dual-energy CT. ultimately, new to this version is a collection of difficulties for every bankruptcy, supplying possibilities to reinforce reader comprehension and perform the appliance of lined fabric.

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Extra resources for Computed tomography. Principles, design, artifacts, and recent advances

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2-7 Show that the mean and standard deviation of Eq. 19) is m. 50 Chapter 2 2-8 Direct calculation of Eq. 19) may result in overflow or underflow errors. Derive a recursive formula for the calculation of the Poisson distribution. That is, express p(x+1) in terms of p(x). , MATLAB® or IDLTM), how do you structure the calculation to avoid overflow or underflow? 2-10 A 2D image is denoted by f(i, j), where i = 1, 2, …, N and j = 1, 2, …, N. In an x-y coordinate system, however, the indexes i and j represent discrete x values from –x1 to x2 at an interval of x, and discrete y values from –y1 to y2 at an interval of y.

The net effect of these interactions (photoelectric, Compton, and coherent scattering) is that some of the photons are absorbed or scattered. In other words, x-ray photons are attenuated when they pass through a material. 10 Percentages of different types of interactions as a function of energy in water. 38) where I and I0 are the incident and transmitted x-ray intensities; L is the thickness of the material; and   and r are the attenuation coefficients of the photoelectric, Compton, and coherent scattering interactions of the material, respectively.

23 To “freeze” cardiac motion, a complete set of projections must be collected within 20 to 50 ms. This is clearly very challenging for conventional third- or fourth-generation types of scanners due to the enormous centripetal force placed on the x-ray tube and the detector. In the electron-beam scanner, the rotation of the source is provided by the sweeping motion of the electron beam (instead of the mechanical motion of the x-ray tube). 18 shows a simplified schematic diagram of an electron-beam scanner.

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Computed tomography. Principles, design, artifacts, and recent advances by Jiang Hsieh

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