Reconstruction from truncated projections in CT using adaptive detruncation

If the object exceeds the field of measurement (FOM) of a given CT scanner, severe artifacts may result. In this work, we propose an adaptive detruncation (ADT) method to reconstruct images from medical CT projections which are truncated in the transaxial direction. The truncated projections are ext...

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Bibliographic Details
Published in:European radiology 2005-05, Vol.15 (5), p.1008-1014
Main Authors: Sourbelle, K, Kachelriess, M, Kalender, W A
Format: Article
Language:English
Subjects:
Algorithms
Approximation
Computed tomography
Convexity
Geometry
Humans
Image Processing, Computer-Assisted - methods
Image reconstruction
Medical imaging
Pelvis
Physical Phenomena
Physics
Positron emission
Positron emission tomography
Scanners
Sensors
Tomography, X-Ray Computed
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Summary:If the object exceeds the field of measurement (FOM) of a given CT scanner, severe artifacts may result. In this work, we propose an adaptive detruncation (ADT) method to reconstruct images from medical CT projections which are truncated in the transaxial direction. The truncated projections are extrapolated by estimating the convex hull of the patient. The ADT method allows us not only to achieve artifact-free images in the FOM but also to extend the images beyond the FOM, and can therefore be very attractive, for example, in PET/CT scanners for attenuation correction.
ISSN:0938-7994
1432-1084
DOI:10.1007/s00330-004-2621-9