Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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High-resolution magnetic resonance imaging of teeth and periodontal tissues using a microscopy coil

  • Shinya Kotaki (Department of Oral Radiology, Osaka Dental University) ;
  • Hiroshi Watanabe (Department of Dental Radiology and Radiation Oncology, Tokyo Medical and Dental University) ;
  • Junichiro Sakamoto (Department of Oral Radiology, Osaka Dental University) ;
  • Ami Kuribayashi (Department of Dental Radiology and Radiation Oncology, Tokyo Medical and Dental University) ;
  • Marino Araragi (Department of Oral Radiology, Osaka Dental University) ;
  • Hironori Akiyama (Department of Oral Radiology, Osaka Dental University) ;
  • Yoshiko Ariji (Department of Oral Radiology, Osaka Dental University)
  • Received : 2024.03.15
  • Accepted : 2024.05.28
  • Published : 2024.09.30
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Abstract

Purpose: This study aimed to assess the performance of 2-dimensional (2D) imaging with microscopy coils in delineating teeth and periodontal tissues compared with conventional 3-dimensional(3D) imaging on a 3 T magnetic resonance imaging (MRI) unit. Materials and Methods: Twelve healthy participants (4 men and 8 women; mean age: 25.6 years; range: 20-52 years) with no dental symptoms were included. The left mandibular first molars and surrounding periodontal tissues were examined using the following 2 sequences: 2D proton density-weighted (PDw) images and 3D enhanced T1 high-resolution isotropic volume excitation (eTHRIVE) images. Two-dimensional MRI images were taken using a 3 T MRI unit and a 47 mm microscopy coil, while 3D MRI imaging used a 3 T MRI unit and head-neck coil. Oral radiologists assessed dental and periodontal structures using a 4-point Likert scale. Inter- and intra-observer agreement was determined using the weighted kappa coefficient. The Wilcoxon signed-rank test was used to compare 2D-PDw and 3D-eTHRIVE images. Results: Qualitative analysis showed significantly better visualization scores for 2D-PDw imaging than for 3D-eTHRIVE imaging (Wilcoxon signed-rank test). 2D-PDw images provided improved visibility of the tooth, root dental pulp, periodontal ligament, lamina dura, coronal dental pulp, gingiva, and nutrient tract. Inter-observer reliability ranged from moderate agreement to almost perfect agreement, and intra-observer agreement was in a similar range. Conclusion: Two-dimensional-PDw images acquired using a 3 T MRI unit and microscopy coil effectively visualized nearly all aspects of teeth and periodontal tissues.

Keywords

Acknowledgement

We thank Prof. Kosuke Kashiwagi, Dr. Yusuke Tsumori, and Dr. Keisuke Hori for statistical software advice, and Mr. Toshiyuki Zaike and Mr. Toshiki Takumi for advice on MRI operation.

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