Windmill artifact in multi-slice helical CT

Michael Silver, Katsuyuki Taguchi, Ilmar Hein, Be Shan Chiang, Masahiro Kazama, Issei Mori

Research output: Contribution to journalConference articlepeer-review

23 Scopus citations


Multi-slice helical CT-systems suffer from windmill artifacts: black/white patterns that spin off of features with high longitudinal gradients. The number of black/white pairs matches the number of slices (detector rows) in the multi-slice detector. The period of the spin is the same as the helical pitch. We investigate the cause of the pattern by following the traces of selected voxels through the multi-slice detector array as a function of view position. This forms an "extracted sinogram" which represents the data used to reconstruct that specific voxel. Now we can determine the cause of the artifact by correlating the windmill streak in the image with the extracted data. The investigation shows that inadequate sampling along the longitudinal direction causes the artifact.

Original languageEnglish (US)
Pages (from-to)1918-1927
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5032 III
StatePublished - Sep 15 2003
Externally publishedYes
EventMedical Imaging 2003: Image Processing - San Diego, CA, United States
Duration: Feb 17 2003Feb 20 2003


  • Artifacts
  • Helical CT
  • Multi-slice CT

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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