New PDF release: Computer Tomography - From Photon Statistics to Modern

By Thorsten M. Buzug

This quantity offers an outline of X-ray expertise and the old improvement of recent CT structures. the main target of the e-book is an in depth derivation of reconstruction algorithms in 2nd and sleek 3D cone-beam structures. an intensive research of CT artifacts and a dialogue of sensible matters comparable to dose concerns provide extra perception into present CT platforms. even supposing written more often than not for graduate scholars, practitioners also will reap the benefits of this book.

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Extra resources for Computer Tomography - From Photon Statistics to Modern Cone-Beam CT

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Besides the physical mechanisms described above, it is also possible that the photon is scattered or absorbed by the nucleus. The photonuclear cross-section is, however, negligible for the diagnostic energy window, because this interaction contributes only to –% of the total attenuation within a narrow energy interval between a few MeV and a few tens of MeV (Leroy and Rancoita ). ) Pair production in the field of an electron is sometimes called triplet production (Leroy and Rancoita ).

In Fig. , different technical configurations of multi-slice detector systems used in Siemens (left) and General Electric (right) multi-slice CT (MSCT) systems are shown. The Siemens detector is a UFCTM adaptive array detector.  mm thick. 5 X-ray Detection Fig. . Cone-beam illumination of a cylindrical detector system. The multi-array system forms a cylinder barrel with the X-ray focus as its center. The source-detector sampling unit, with diameter FDD (Focus-Detector-Distance), is rotating on a circle (dashed line) with the iso-center inside the field of measurement detector segments.

Is the origin of what is called the beamhardening artifact. ) is used. Therefore, this is the basic model that will be used throughout this book. )  is defined for convenience. It is essentially the negative logarithm of the ratio of the incoming and outgoing number of photons. In the technical realization of CT, one is restricted to a certain discretization of the reconstructed images. When an X-ray beam runs through the continuous matter, such a partitioning of the penetrated material cannot be physically measured.

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Computer Tomography - From Photon Statistics to Modern Cone-Beam CT by Thorsten M. Buzug


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