Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Quantification of ring artifact visibility in CT
KTH, School of Engineering Sciences (SCI), Physics.ORCID iD: 0000-0002-5092-8822
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.ORCID iD: 0000-0002-3039-9791
2012 (English)In: Medical Imaging 2012: Physics Of Medical Imaging, SPIE - International Society for Optical Engineering, 2012, Vol. 8313, 83132J- p.Conference paper, Published paper (Refereed)
Abstract [en]

Ring artifacts appear in computed tomography images if there are too large inhomogeneities between different detector elements. The question of how large inhomogeneities are acceptable is gaining in importance due to the development of energy discriminating photon counting CT, where detector homogeneity is an important design parameter. We propose using the systematic-to-statistical error quotient q, defined as the variance of the expected log-normalized count number between detector elements (dels) divided by the variance of log-normalized count numbers measured with the same del, as a metric of ring artifact visibility. With a simple observer study using simulated images, it is shown that rings are visible in the reconstructed image if q exceeds a threshold which lies close to 1.2·10 -3 for 1500 detector elements and 2000 projection angles. It is also shown by visual inspection of simulated images that the threshold value is, to a good approximation, inversely proportional to the number of angle measurements and independent of the number of detector elements. The results suggest that a simple oberver study, together with these scaling relationships, is sufficient for establishing sinogram homogeneity requirements for a particular reconstruction method.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2012. Vol. 8313, 83132J- p.
Series
Progress in Biomedical Optics and Imaging, ISSN 1605-7422 ; 8313
Keyword [en]
Computed tomography, homogeneity requirements, observer study, ring artifacts
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:kth:diva-98183DOI: 10.1117/12.910537ISI: 000304768000086Scopus ID: 2-s2.0-84860354258ISBN: 978-081948962-3 (print)OAI: oai:DiVA.org:kth-98183DiVA: diva2:536042
Conference
Medical Imaging 2012: Physics of Medical Imaging;San Diego, CA;5 February 2012 through 8 February 2012
Note

QC 20120621

Available from: 2012-06-21 Created: 2012-06-20 Last updated: 2015-04-30Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Authority records BETA

Persson, Mats

Search in DiVA

By author/editor
Persson, MatsMeyer, BettinaBornefalk, HansDanielsson, Mats
By organisation
PhysicsPhysics of Medical Imaging
Radiology, Nuclear Medicine and Medical Imaging

Search outside of DiVA

GoogleGoogle Scholar

doi
isbn
urn-nbn

Altmetric score

doi
isbn
urn-nbn
Total: 50 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf