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<p>Magnetic resonance imaging (MRI) has been employed to obtain high-resolution images of dental structures using intraoral and dedicated coils; however, reports on microscopy coils are limited. Furthermore, no reports have detailed the imaging conditions for the clinical application of T<sub>1</sub>-weighted (T<sub>1</sub>W), T<sub>2</sub>-weighted (T<sub>2</sub>W), and proton density-weighted (PDW) sequences in dental MRI. This study investigated the optimal imaging conditions for clinical dental MRI. Phantoms simulating the dental pulp and bone marrow were constructed, and imaging was performed using a 3T-MRI system and a microscopy coil with varying T<sub>1</sub>W, T<sub>2</sub>W, and PDW parameters to determine the trends in change. Subsequently, we imaged the left mandibular first molar region of 21 healthy volunteers using clinically feasible parameters. Tooth visibility was assessed for the T<sub>1</sub>W, T<sub>2</sub>W, and PDW images, while contrast ratio (CR) and signal-to-noise ratio (SNR) were calculated and statistically analyzed. Results showed that PDW significantly outperformed T<sub>1</sub>W and T<sub>2</sub>W in terms of tooth visibility, CR, and SNR. Under the specified imaging conditions, PDW was optimal for tooth and periodontal tissue morphology evaluation. A statistically significant difference in CR and tooth visibility evaluation was observed between T<sub>1</sub>W and T<sub>2</sub>W in the dental pulp. This statistically significant difference suggested that T<sub>2</sub>W can be used to evaluate the dental pulp, and T<sub>1</sub>W can be used to evaluate the inferior alveolar nerve and bone marrow properties.</p>

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Investigation of imaging conditions for dental MRI using 3T-MRI system with microscopy coil in clinical situation

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Toshiyuki Zaike,
  • Shinya Kotaki,
  • Marino Araragi,
  • Yoshiko Ariji,
  • Shigeyoshi Saito

摘要

Magnetic resonance imaging (MRI) has been employed to obtain high-resolution images of dental structures using intraoral and dedicated coils; however, reports on microscopy coils are limited. Furthermore, no reports have detailed the imaging conditions for the clinical application of T1-weighted (T1W), T2-weighted (T2W), and proton density-weighted (PDW) sequences in dental MRI. This study investigated the optimal imaging conditions for clinical dental MRI. Phantoms simulating the dental pulp and bone marrow were constructed, and imaging was performed using a 3T-MRI system and a microscopy coil with varying T1W, T2W, and PDW parameters to determine the trends in change. Subsequently, we imaged the left mandibular first molar region of 21 healthy volunteers using clinically feasible parameters. Tooth visibility was assessed for the T1W, T2W, and PDW images, while contrast ratio (CR) and signal-to-noise ratio (SNR) were calculated and statistically analyzed. Results showed that PDW significantly outperformed T1W and T2W in terms of tooth visibility, CR, and SNR. Under the specified imaging conditions, PDW was optimal for tooth and periodontal tissue morphology evaluation. A statistically significant difference in CR and tooth visibility evaluation was observed between T1W and T2W in the dental pulp. This statistically significant difference suggested that T2W can be used to evaluate the dental pulp, and T1W can be used to evaluate the inferior alveolar nerve and bone marrow properties.