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Intraoral Coil Arrays for Single-Tooth Dental MRI.

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Radiology

Background:

  • Magnetic Resonance Imaging (MRI) offers superior contrast for diagnosing dental pathologies compared to X-ray and CBCT.
  • Current extraoral radiofrequency (RF) coils in dental MRI have limited signal-to-noise ratio (SNR), restricting spatial resolution.
  • Developing advanced imaging techniques is crucial for improving the detection of dental conditions.

Purpose of the Study:

  • To propose and evaluate a novel intraoral coil (IOC) array for high-resolution dental MRI.
  • To achieve 250 μm isotropic resolution and enable parallel imaging for enhanced diagnostic accuracy.
  • To overcome the SNR limitations of existing extraoral coils.

Main Methods:

  • A capacitively decoupled 2-channel IOC array with buccal and lingual elements was designed and tested.
  • Phantom and in vivo measurements were conducted at 3 Tesla (3T).
  • Performance was compared against an external loop coil and a single-channel IOC, assessing sensitivity, SNR, and g-factor for parallel imaging acceleration.

Main Results:

  • The IOC array demonstrated up to a 20-fold improvement in SNR compared to an extraoral loop coil.
  • It provided more uniform sensitivity and enabled parallel imaging with a g-factor below 1.07 for 2-fold acceleration.
  • A resolution of (250 μm)³ was achieved for premolar and molar teeth using a T1-SPACE protocol in under 2 minutes.

Conclusions:

  • Intraoral coil arrays are feasible for dental MRI, offering superior homogeneity and SNR over extraoral coils.
  • The ability to perform parallel imaging significantly reduces acquisition time, enhancing diagnostic potential.
  • This technology represents a significant advancement in dental imaging capabilities.