Principles behind Computed Tomography (CT)

Mikael Gunnarsson, Kristina Ydström

Forskningsoutput: Kapitel i bok/rapport/Conference proceedingKapitel samlingsverkForskningPeer review


The use of Computed tomography (CT) for anatomical information in a combination with the SPECT system has in many ways added substantial information to many nuclear medicine imaging procedures. The information from the CT system can provide information on the location of lesions and can be used for attenuation correction. Modern SPECT/CT and PET/CT today have CT scanners that provide diagnostic quality. This chapter provides the principles behind the X-ray imaging and in particular CT. It describes scanner configurations and components for a typical CT system and how data are acquired. Also, a short description of dual-energy systems that provide additional information is included. Iterative reconstruction of image, and the definition of the Hounsfield unit is discussed together with how different factors affect the image quality. A part of the chapter also discusses CT dosimetry and how the absorbed doses can be measured, quantified, and possibly be reduced. A section also discusses different types of artefacts in the images caused by, for example, metals, respiratory movements, and beam hardening.
Titel på värdpublikationHandbook of Nuclear Medicine and Molecular Imaging for Physicists
Undertitel på värdpublikationInstrumentation and Imaging Procedures
RedaktörerMichael Ljungberg
UtgivningsortBoca Raton
FörlagCRC Press
Antal sidor15
ISBN (elektroniskt)9780429489556
ISBN (tryckt)9781138593268
StatusPublished - 2022 apr. 22


NamnSeries in Medical Physics and Biomedical Engineering
FörlagCRC Press

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