The cause of the artifact in 4-slice helical computed tomography

Katsuyuki Taguchi, Hiroshi Aradate, Yasuo Saito, Ilan Zmora, Kyung S. Han, Michael D. Silver

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The causes of the image artifacts in a 4-slice helical computed tomography have been discussed as follows: (1) changeover in pairs of data used in z interpolation, (2) sampling interval in z, and (3) the cone angle. This study analyzes the first two causes of the artifact and describes how the current algorithm [K. Taguchi and H. Aradate, Radiology 205P, 390 (1997); 205P, 618 (1997); Med. Phys. 25, 550-561 (1998); H. Hu, ibid. 26, 5-18 (1999); S. Schaller et al., IEEE Trans. Med. Imaging 19, 822-834 (2000); K. Taguchi, Ph.D. thesis, University of Tsukuba, 2002] solves the problem. An interpolated sinogram for a slice at the edge of a ball phantom shows discontinuity caused by the changeover. If we extend the streak artifact in the reconstructed image, it crosses the focus orbit at the corresponding projection angle. Applying z filtering can reduce such causes by its feathering effect and mixing data obtained by different cone angles; the best results are provided when z filtering is applied to densely sampled helical data.

Original languageEnglish (US)
Pages (from-to)2033-2037
Number of pages5
JournalMedical physics
Issue number7
StatePublished - Jul 2004
Externally publishedYes


  • Computed tomography
  • Helical scan
  • Image artifacts
  • Multi-slice CT

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging


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