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31.03.2016 | Scientific Article

Performances of low-dose dual-energy CT in reducing artifacts from implanted metallic orthopedic devices

verfasst von: Laura Filograna, Nicola Magarelli, Antonio Leone, Chiara de Waure, Giovanna Elisa Calabrò, Tim Finkenstaedt, Michael John Thali, Lorenzo Bonomo

Erschienen in: Skeletal Radiology | Ausgabe 7/2016

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Abstract

Objectives

The objective was to evaluate the performances of dose-reduced dual-energy computed tomography (DECT) in decreasing metallic artifacts from orthopedic devices compared with dose-neutral DECT, dose-neutral single-energy computed tomography (SECT), and dose-reduced SECT.

Materials and methods

Thirty implants in 20 consecutive cadavers underwent both SECT and DECT at three fixed CT dose indexes (CTDI): 20.0, 10.0, and 5.0 mGy. Extrapolated monoenergetic DECT images at 64, 69, 88, 105, 120, and 130 keV, and individually adjusted monoenergy for optimized image quality (OPTkeV) were generated. In each group, the image quality of the seven monoenergetic images and of the SECT image was assessed qualitatively and quantitatively by visually rating and by measuring the maximum streak artifact respectively.

Results

The comparison between SECT and OPTkeV evaluated overall within all groups showed a significant difference (p <0.001), with OPTkeV images providing better images. Comparing OPTkeV with the other DECT images, a significant difference was shown (p <0.001), with OPTkeV and 130-keV images providing the qualitatively best results. The OPTkeV images of 5.0-mGy acquisitions provided percentages of images with scores 1 and 2 of 36 % and 30 % respectively, compared with 0 % and 33.3 % of the corresponding SECT images of 10- and 20-mGy acquisitions. Moreover, DECT reconstructions at the OPTkeV of the low-dose group showed higher CT numbers than the SECT images of dose groups 1 and 2.

Conclusions

This study demonstrates that low-dose DECT permits a reduction of artifacts due to metallic implants to be obtained in a similar manner to neutral-dose DECT and better than reduced or neutral-dose SECT.

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Titel: Performances of low-dose dual-energy CT in reducing artifacts from implanted metallic orthopedic devices
verfasst von: Laura Filograna
Nicola Magarelli
Antonio Leone
Chiara de Waure
Giovanna Elisa Calabrò
Tim Finkenstaedt
Michael John Thali
Lorenzo Bonomo
Publikationsdatum: 31.03.2016
Verlag: Springer Berlin Heidelberg
Erschienen in: Skeletal Radiology / Ausgabe 7/2016
Print ISSN: 0364-2348
Elektronische ISSN: 1432-2161
DOI: https://doi.org/10.1007/s00256-016-2377-8

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Performances of low-dose dual-energy CT in reducing artifacts from implanted metallic orthopedic devices