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Computed Tomography: Physical principles and biohazards
Linköping University, Department of Medicine and Care, Radio Physics. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics.ORCID iD: 0000-0003-3352-8330
1995 (English)Report (Other academic)
Abstract [en]

In planar projected images of the patient, important details may be hidden by over-laying tissues. By using slice-imaging techniques (tomography), selective demonstration of morphologic properties, layer by layer, may be performed.

Computerised tomography, CT, is an ideal form of tomography yielding sequence images of thin consecutive slices of the patient and providing the opportunity to localise in three dimensions. Unlike conventional, classical tomography, computerised tomography does not suffer from interference from structures in the patient outside the slice being imaged. This is achieved by irradiating only thin slices of the patient with a fan-shaped beam. Transaxial images (tomograms) of the patient’s anatomy can give more selective information than conventional planar projection radiographs. Compared to planar radiography, CT images have superior contrast resolution, i.e., they are capable of distinguishing very small differences in tissue-attenuation (contrasts), but have inferior spatial resolution. An attenuation difference of 0.4% can be visualised but the smallest details in the image that can be resolved must be separated at least 0.5 mm. In conventional planar radiography, the lowest detectable contrast is larger but details of smaller size can be separated.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press , 1995. , 17 p.
Report / Department of Radiology, Linköping University, 1990-1997, ISSN 1102-1799 ; 81
National Category
Radiology, Nuclear Medicine and Medical Imaging
URN: urn:nbn:se:liu:diva-57803ISRN: LIU-RAD-R--81OAI: diva2:327804
Available from: 2010-06-30 Created: 2010-06-30 Last updated: 2013-09-03Bibliographically approved

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Sandborg, Michael
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Radio PhysicsFaculty of Health SciencesDepartment of Radiation Physics
Radiology, Nuclear Medicine and Medical Imaging

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