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Reduction of metal artifacts due to dental hardware in computed tomography angiography: assessment of the utility of model-based iterative reconstruction

  • Diagnostic Neuroradiology
  • Published:
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Abstract

Purpose

The aim of this study is to assess the value of adaptive statistical iterative reconstruction (ASIR) and model-based iterative reconstruction (MBIR) for reduction of metal artifacts due to dental hardware in carotid CT angiography (CTA).

Methods

Thirty-seven patients with dental hardware who underwent carotid CTA were included. CTA was performed with a GE Discovery CT750 HD scanner and reconstructed with filtered back projection (FBP), ASIR, and MBIR. We measured the standard deviation at the cervical segment of the internal carotid artery that was affected most by dental metal artifacts (SD1) and the standard deviation at the common carotid artery that was not affected by the artifact (SD2). We calculated the artifact index (AI) as follows: AI = [(SD1)2 − (SD2)2]1/2 and compared each AI for FBP, ASIR, and MBIR. Visual assessment of the internal carotid artery was also performed by two neuroradiologists using a five-point scale for each axial and reconstructed sagittal image. The inter-observer agreement was analyzed using weighted kappa analysis.

Results

MBIR significantly improved AI compared with FBP and ASIR (p < 0.001, each). We found no significant difference in AI between FBP and ASIR (p = 0.502). The visual score of MBIR was significantly better than those of FBP and ASIR (p < 0.001, each), whereas the scores of ASIR were the same as those of FBP. Kappa values indicated good inter-observer agreements in all reconstructed images (0.747–0.778).

Conclusions

MBIR resulted in a significant reduction in artifact from dental hardware in carotid CTA.

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Acknowledgements

The authors thank Naoki Iwata and Junichi Kishimoto of the Division of Clinical Radiology, Tottori University Hospital, who provided support with regard to the technical terms related to the scanning system.

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Authors and Affiliations

  1. Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University, 36-1, Nishi-cho, Yonago, 683-8504, Japan

    Keita Kuya, Yuki Shinohara & Toshihide Ogawa

  2. Department of Radiology, Tottori Municipal Hospital, Yonago, Japan

    Ayumi Kato

  3. Division of Neurosurgery, Department of Neurological Sciences, Faculty of Medicine, Tottori University, Yonago, Japan

    Makoto Sakamoto & Masamichi Kurosaki

Authors
  1. Keita Kuya
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  2. Yuki Shinohara
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  3. Ayumi Kato
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  4. Makoto Sakamoto
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  5. Masamichi Kurosaki
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  6. Toshihide Ogawa
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Corresponding author

Correspondence to Yuki Shinohara.

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Funding

No funding was received for this study.

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments. For this type of study, formal consent is not required.

Informed consent

Informed consent was obtained from all individual participants included in the study.

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Kuya, K., Shinohara, Y., Kato, A. et al. Reduction of metal artifacts due to dental hardware in computed tomography angiography: assessment of the utility of model-based iterative reconstruction. Neuroradiology 59, 231–235 (2017). https://doi.org/10.1007/s00234-017-1811-5

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  • DOI: https://doi.org/10.1007/s00234-017-1811-5

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