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Quantification of ring artifact visibility in CT
KTH, Skolan för teknikvetenskap (SCI), Fysik.ORCID-id: 0000-0002-5092-8822
KTH, Skolan för teknikvetenskap (SCI), Fysik, Medicinsk bildfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Medicinsk bildfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Medicinsk bildfysik.ORCID-id: 0000-0002-3039-9791
2012 (Engelska)Ingår i: Medical Imaging 2012: Physics Of Medical Imaging, SPIE - International Society for Optical Engineering, 2012, Vol. 8313, s. 83132J-Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
SPIE - International Society for Optical Engineering, 2012. Vol. 8313, s. 83132J-
Serie
Progress in Biomedical Optics and Imaging, ISSN 1605-7422 ; 8313
Nyckelord [en]
Computed tomography, homogeneity requirements, observer study, ring artifacts
Nationell ämneskategori
Radiologi och bildbehandling
Identifikatorer
URN: urn:nbn:se:kth:diva-98183DOI: 10.1117/12.910537ISI: 000304768000086Scopus ID: 2-s2.0-84860354258ISBN: 978-081948962-3 (tryckt)OAI: oai:DiVA.org:kth-98183DiVA, id: diva2:536042
Konferens
Medical Imaging 2012: Physics of Medical Imaging;San Diego, CA;5 February 2012 through 8 February 2012
Anmärkning

QC 20120621

Tillgänglig från: 2012-06-21 Skapad: 2012-06-20 Senast uppdaterad: 2015-04-30Bibliografiskt granskad

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Persson, Mats

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Persson, MatsMeyer, BettinaBornefalk, HansDanielsson, Mats
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