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Clinical evaluation of a newly developed method for avoiding artifacts caused by dental fillings on X-ray CT

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Abstract

To evaluate the clinical usefulness of gantry tilt scanning as an image reconstruction technique for avoiding artifacts caused by metallic dental fillings. Gantry tilt scanning was used with multidetector-row computed tomography for imaging in patients with dental fillings. Using a novel PC-based program, the oblique images obtained were reconstructed to transverse images using nearest neighbor and bilinear interpolation methodologies in order to avoid metallic streak artifacts. Coronal images were reformatted with the reconstructed transverse images, and the continuity of the reconstructed images was evaluated. Gantry tilt scanning was performed in 12 patients with metal artifacts, and the original and reconstructed images were classified into four grades and assessed by two radiologists. Results of the clinical evaluation indicated that the original images with artifacts, only 4% had good image quality in the region around the medial pterygoid muscle, only 8% depicted areas around the internal carotid artery and internal jugular vein, and only 12% could depict the areas around the parotid gland in the clinical evaluation. These values were improved to 60, 96, and 100%, respectively, in the reconstructed transverse images. Gantry tilt scanning as an image reconstruction technique improves image quality and removes most, if not all, artifacts caused by metallic dental fillings. The resulting images can be used in the evaluation of oropharyngeal lesions in patients with dental fillings.

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Acknowledgments

The authors would like to thank the Editorial Assistant for initial polishing, and also the Reviewer, Associate Editor and Deputy Editor of Radiological Physics and Technology for providing us excellent assistance and advice. The authors were indebted to the radiologists and the otorhinolaryngologists of Hyogo College of Medicine for medical assistance and the radiological technologists of the Hospital of Hyogo College of Medicine for technical assistance in preparing the manuscript.

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Authors and Affiliations

  1. Department of Clinical Radiology, The Hospital of Hyogo College of Medicine, 1-1 Mukogawa-Cho, Nishinomiya, Hyogo, 663-8131, Japan

    Yasuo Nakae, Kiyoshi Sakamoto, Takahiro Minamoto & Toshiko Kamakura

  2. Department of Medical Physics, Osaka University Graduate School of Medicine, 1-7 Yamadaoka, Suita, Osaka, 565-0871, Japan

    Yuji Ogata, Mitsuhiro Matsumoto & Takeshi Johkou

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  1. Yasuo Nakae
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  2. Kiyoshi Sakamoto
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  3. Takahiro Minamoto
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  4. Toshiko Kamakura
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  5. Yuji Ogata
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  6. Mitsuhiro Matsumoto
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  7. Takeshi Johkou
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Correspondence to Yasuo Nakae.

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Nakae, Y., Sakamoto, K., Minamoto, T. et al. Clinical evaluation of a newly developed method for avoiding artifacts caused by dental fillings on X-ray CT. Radiol Phys Technol 1, 115–122 (2008). https://doi.org/10.1007/s12194-007-0016-8

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  • DOI: https://doi.org/10.1007/s12194-007-0016-8

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