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By Jiang Hsieh

X-ray computed tomography (CT) maintains to event fast development, either in easy expertise and new scientific functions. Seven years after its first version, Computed Tomography: ideas, layout, Artifacts, and up to date developments, moment variation, offers an outline of the evolution of CT, the mathematical and actual points of the know-how, and the basics of picture reconstruction algorithms. photo reveal is tested from conventional equipment used in the course of the most up-to-date developments. Key functionality indices, theories at the back of the dimension methodologies, and diversified size phantoms in photo caliber are mentioned.

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Extra resources for Computed Tomography Principles, Design, Artifacts, and Recent Advances

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In a CT Preliminaries 51 system, do you need to store the curve of water(E) in order to generate an accurate CT number? 3 mentioned that one source of error is the nonideal detector response. 100 where n is the sampling index. 2n, where n = 0, 1, … . Calculate the detector output for n = 10, 20, and 100. 2-19 Repeat the above calculation for the case where the detector’s impulse response is input dependent. 01 p( k )  . k 0   2-20 Assume that the average input x-ray flux is I0 = 106 and the average measured transmitted x-ray fluxes are I = 101, 103, and 105 with a Poisson distribution.

If not, how is the focal plane defined, assuming the digital detector is capable of high-speed sampling? 1-5 One application of x-ray CT technology is luggage scanning for airport security. Luggage is transported over a conveyer belt, and cross-sectional images of the luggage are generated and analyzed for security threats. List at least three similarities and three differences between a medical CT device and a luggage CT device in terms of technical design considerations. 1-6 List three advantages and three disadvantages of the fourth-generation CT scanner over the third-generation CT scanner.

Clearly, the difference is quite small. 12 Linear attenuation coefficients for different materials. 40) where water is the linear attenuation coefficient of water. This unit is often called the Hounsfield unit (HU), honoring the inventor of CT. By definition, water has a CT number of zero. The CT number for air is –1000 HU, since air = 0. Soft tissues (including fat, muscle, and other body tissues) have CT numbers ranging from –100 HU to 60 HU. Cortical bones are more attenuating and have CT numbers from 250 HU to over 1000 HU.

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