CT Angiography for Detecting Intracranial Occlusive Arterial Disease: Various Parameters

Michael Mu Huo Teng*, Adrian Jy Kang Liou, Jhng Feng Lirng, Chao Bao Luo, Shing Su Chen, Wan Yuo Guo, Jen Huey Chiang, Cheng Yen Chang, Chien Fan Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


To optimize parameters of computed tomographic angiography (CTA) and to make it a useful tool for detecting intracranial occlusive vascular disease. Two connecting tubes filled with 1% Telebrix-38 in normal saline were used as a model vessel for CTA. Multiple CTA's were performed after changing the following parameters: slice thickness (collimation, 1-3mm), pitch (1-3), and reconstruction spacing (0.1-1mm). Zigzag margin and artifacts of bands of low density (partial volume and stairstep artifact) were found on the vessel model nearly horizontal to the data collection plane (axial). These bands were more obvious at higher pitches and wider collimation. They were not seen on the model vessel vertical to the data collection plane. They were less obvious on the superior view of the vessel model. The effects of partial volume and stairstep artifact have to be considered when using caliber changes in CTA in the diagnosis of thrombosis or arteriosclerosis. To reduce these effects, the pitch should be low, and the collimation should be narrow.

Original languageEnglish
Pages (from-to)137-141
Number of pages5
JournalChinese Journal of Radiology
Issue number4
StatePublished - Aug 1998


  • Computed tomography (CT), angiography
  • Computed tomography (CT), helical
  • Computed tomography (CT), technology


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