By Jiang Hsieh
Six years after its first variation, Computed Tomography: rules, layout, Artifacts, and up to date Advances, moment Edition offers and up-to-date review of the evolution of CT, the mathematical and actual facets of the know-how, and the basics of picture reconstruction algorithms. Given the excessive visibility and public understanding of the impression of x-ray radiation, the second one variation encompasses a new bankruptcy on x-ray dose and provides diversified dose relief recommendations starting from sufferer dealing with, optimum info acquisition, picture reconstruction, and postprocess. in accordance with the developments over the last six years, the second one variation comprises new sections on cone beam reconstruction algorithms, nonconventional helical acquisition and reconstruction, new reconstruction methods, and dual-energy CT. eventually, new to this version is a collection of difficulties for every bankruptcy, supplying possibilities to augment reader comprehension and perform the applying of lined fabric.
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Extra info for Computed tomography. Principles, design, artifacts, and recent advances
28) If A and B are m × n matrices, their elemental product C is also an m × n matrix: a11b11 a b C = A B = 21 21 am1bm1 a12b12 a22b22 am 2bm 2 a1n b1n a2 n b2 n . 29) Similarly, we define the elemental division of a scalar r by a matrix A as r / a11 r r / a21 A r / am1 r / a12 r / a22 r / am 2 r / a1n r / a2 n . 30) Preliminaries 33 a11 / b11 A a21 / b21 B am1 / bm1 a12 / b12 a22 / b22 am 2 / bm 2 a1n / b1n a2 n / b2 n . 31) In the same spirit, we can define a set of matrix trigonometry functions such as sin(A), cos(A), and tan(A).
The process is as follows: First, the Fourier transform of the original signal is performed. When the original signal contains N samples, its corresponding DFT also contains N samples. If the original sampling density must be increased by a factor of K, we pad (K–1)N zeroes to the Fourier transform before the inverse Fourier transform is performed. Thus, the original signal is expanded to KN samples, as shown in Fig. 2. (4) Shift property: The Fourier transform of f(x–x0) is e j 2 ux0 F (u ).
Now consider the case of a nonuniform object (an object made of multiple materials with different attenuation coefficients). The overall attenuation characteristics can be calculated by dividing the object into smaller elements, as shown in Fig. 13(b). When the size of each element is sufficiently small, each element can be considered as a uniform object. 41) is now valid to describe the entrance and exit x-ray intensities for each element. Since the exit xray flux from an element is the entrance x-ray flux to its neighbor, Eq.