Evaluation of monoenergetic imaging to reduce metallic instrumentation artifacts in computed tomography of the cervical spine.

Details

Serval ID
serval:BIB_3AEF75DE0683
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Evaluation of monoenergetic imaging to reduce metallic instrumentation artifacts in computed tomography of the cervical spine.
Journal
Journal of Neurosurgery. Spine
Author(s)
Komlosi P., Grady D., Smith J.S., Shaffrey C.I., Goode A.R., Judy P.G., Shaffrey M., Wintermark M.
ISSN
1547-5646 (Electronic)
ISSN-L
1547-5646
Publication state
Published
Issued date
2015
Volume
22
Number
1
Pages
34-38
Language
english
Notes
Publication types: Journal ArticlePublication Status: ppublish
Abstract
OBJECT Monoenergetic imaging with dual-energy CT has been proposed to reduce metallic artifacts in comparison with conventional polychromatic CT. The purpose of this study is to systematically evaluate and define the optimal dual-energy CT imaging parameters for specific cervical spinal implant alloy compositions. METHODS Spinal fixation rods of cobalt-chromium or titanium alloy inserted into the cervical spine section of an Alderson Rando anthropomorphic phantom were imaged ex vivo with fast-kilovoltage switching CT at 80 and 140 peak kV. The collimation width and field of view were varied between 20 and 40 mm and medium to large, respectively. Extrapolated monoenergetic images were generated at 70, 90, 110, and 130 kiloelectron volts (keV). The standard deviation of voxel intensities along a circular line profile around the spine was used as an index of the magnitude of metallic artifact. RESULTS The metallic artifact was more conspicuous around the fixation rods made of cobalt-chromium than those of titanium alloy. The magnitude of metallic artifact seen with titanium fixation rods was minimized at monoenergies of 90 keV and higher, using a collimation width of 20 mm and large field of view. The magnitude of metallic artifact with cobalt-chromium fixation rods was minimized at monoenergies of 110 keV and higher; collimation width or field of view had no effect. CONCLUSIONS Optimization of acquisition settings used with monoenergetic CT studies might yield reduced metallic artifacts.
Pubmed
Web of science
Create date
22/01/2015 19:11
Last modification date
20/08/2019 13:30
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