By Jiang Hsieh
ISBN-10: 0470563532
ISBN-13: 9780470563533
X-ray computed tomography (CT) keeps to adventure swift development, either in easy know-how and new medical functions. Seven years after its first version, Computed Tomography: ideas, layout, Artifacts, and up to date developments, moment version, presents an summary of the evolution of CT, the mathematical and actual features of the expertise, and the basics of photograph reconstruction algorithms. photo reveal is tested from conventional tools used during the newest developments. Key functionality indices, theories in the back of the dimension methodologies, and varied size phantoms in picture caliber are mentioned.
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Extra resources for Computed Tomography Principles, Design, Artifacts, and Recent Advances
Example text
A fourth source of measurement inaccuracy comes from the scanned object itself. In most clinical applications, the object of interest is a living patient. Even the most advanced CT scanners take seconds to complete their coverage of an organ, so voluntary and involuntary patient motions are inevitable. As a result, projections taken at different moments in time do not represent the attenuation line integrals of the same object, a circumstance that deviates from the basic tomographic assumption.
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When multiple target tracks and detector rings are used, a coverage of 8 cm along the patient long axis can be obtained for the heart. Since the system has no mechanical moving parts, scan times as fast as 50 ms can be achieved. However, for noise considerations, multiple scans are often averaged to produce the final image. A more complete description of the electron-beam scanner can be found in Ref 24. 18 Geometry of an electron-beam scanner. 1 discussed conventional tomography and the many drawbacks and shortcomings of this technique.