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Reduction of metallic coil artefacts in computed tomography body imaging: effects of a new single-energy metal artefact reduction algorithm

  • Computed Tomography
  • Published:
European Radiology Aims and scope Submit manuscript

Abstract

Objectives

We evaluated the effect of a single-energy metal artefact reduction (SEMAR) algorithm for metallic coil artefact reduction in body imaging.

Methods

Computed tomography angiography (CTA) was performed in 30 patients with metallic coils (10 men, 20 women; mean age, 67.9 ± 11 years). Non-SEMAR images were reconstructed with iterative reconstruction alone, and SEMAR images were reconstructed with the iterative reconstruction plus SEMAR algorithms. We compared image noise around metallic coils and the maximum diameters of artefacts from coils between the non-SEMAR and SEMAR images. Two radiologists visually evaluated the metallic coil artefacts utilizing a four-point scale: 1 = extensive; 2 = strong; 3 = mild; 4 = minimal artefacts.

Results

The image noise and maximum diameters of the artefacts of the SEMAR images were significantly lower than those of the non-SEMAR images (65.1 ± 33.0 HU vs. 29.7 ± 10.3 HU; 163.9 ± 54.8 mm vs. 10.3 ± 19.0 mm, respectively; P < 0.001). Better visual scores were obtained with the SEMAR technique (3.4 ± 0.6 vs. 1.0 ± 0.0, P < 0.001).

Conclusions

The SEMAR algorithm significantly reduced artefacts caused by metallic coils compared with the non-SEMAR algorithm. This technique can potentially increase CT performance for the evaluation of post-coil embolization complications.

Key Points

• The new algorithm involves a raw data- and image-based reconstruction technique.

• The new algorithm mitigates artefacts from metallic coils on body CT images.

• The new algorithm significantly reduced artefacts caused by metallic coils.

• The metal artefact reduction algorithm improves CT image quality after coil embolization.

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Acknowledgement

We thank Akira Taniguchi and Takashi Tsutsumi (Center for Medical Research & Development, Toshiba Medical Systems Corporation) for valuable technical comments.

The scientific guarantor of this publication is Yasuyuki Yamashita. The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article. The authors state that this work has not received any funding. No complex statistical methods were necessary for this paper. Institutional review board approval was obtained. Written informed consent was obtained from all subjects (patients) in this study.

No study subjects or cohorts have been previously reported. Methodology: retrospective, experimental, performed at one institution.

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Authors and Affiliations

  1. Department of Diagnostic Radiology, Faculty of Life Sciences, Kumamoto University, 1-1-1, Honjo, Kumamoto, 860-8556, Japan

    Masafumi Kidoh, Daisuke Utsunomiya, Osamu Ikeda, Yoshitaka Tamura, Seitaro Oda, Hideaki Yuki, Takeshi Nakaura, Toshinori Hirai & Yasuyuki Yamashita

  2. Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, 1-1-1, Honjo, Kumamoto, 860-8556, Japan

    Yoshinori Funama

  3. Department of Neurosurgery, Faculty of Life Sciences Research, Kumamoto University Graduate School, 1-1-1, Honjo, Kumamoto, 860-8556, Japan

    Takayuki Kawano

Authors
  1. Masafumi Kidoh
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  2. Daisuke Utsunomiya
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  3. Osamu Ikeda
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  4. Yoshitaka Tamura
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  11. Yasuyuki Yamashita
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Corresponding author

Correspondence to Masafumi Kidoh.

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Kidoh, M., Utsunomiya, D., Ikeda, O. et al. Reduction of metallic coil artefacts in computed tomography body imaging: effects of a new single-energy metal artefact reduction algorithm. Eur Radiol 26, 1378–1386 (2016). https://doi.org/10.1007/s00330-015-3950-6

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  • DOI: https://doi.org/10.1007/s00330-015-3950-6

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