Investigative Magnetic Resonance Imaging

Korean Society of Magnetic Resonance in Medicine (대한자기공명의과학회)
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Improvement of Fat Suppression and Artifact Reduction Using IDEAL Technique in Head and Neck MRI at 3T

  • Hong, Jin Ho (Department of Radiology, Inha University Hospital, Inha University School of Medicine) ;
  • Lee, Ha Young (Department of Radiology, Inha University Hospital, Inha University School of Medicine) ;
  • Kang, Young Hye (Department of Radiology, Inha University Hospital, Inha University School of Medicine) ;
  • Lim, Myung Kwan (Department of Radiology, Inha University Hospital, Inha University School of Medicine) ;
  • Kim, Yeo Ju (Department of Radiology, Inha University Hospital, Inha University School of Medicine) ;
  • Cho, Soon Gu (Department of Radiology, Inha University Hospital, Inha University School of Medicine) ;
  • Kim, Mi Young (Department of Radiology, Inha University Hospital, Inha University School of Medicine)
  • Received : 2016.03.17
  • Accepted : 2016.03.22
  • Published : 2016.03.30
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Abstract

Purpose: To quantitatively and qualitatively compare fat-suppressed MRI quality using iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) with that using frequency selective fat-suppression (FSFS) T2- and postcontrast T1-weighted fast spin-echo images of the head and neck at 3T. Materials and Methods: The study was approved by our Institutional Review Board. Prospective MR image analysis was performed in 36 individuals at a single-center. Axial fat suppressed T2- and postcontrast T1-weighted images with IDEAL and FSFS were compared. Visual assessment was performed by two independent readers with respect to; 1) metallic artifacts around oral cavity, 2) susceptibility artifacts around upper airway, paranasal sinus, and head-neck junction, 3) homogeneity of fat suppression, 4) image sharpness, 5) tissue contrast of pathologies and lymph nodes. The signal-to-noise ratios (SNR) for each image sequence were assessed. Results: Both IDEAL fat suppressed T2- and T1-weighted images significantly reduced artifacts around airway, paranasal sinus, and head-neck junction, and significantly improved homogeneous fat suppression in compared to those using FSFS (P < 0.05 for all). IDEAL significantly decreased artifacts around oral cavity on T2-weighted images (P < 0.05, respectively) and improved sharpness, lesion-to-tissue, and lymph node-to-tissue contrast on T1-weighted images (P < 0.05 for all). The mean SNRs were significantly improved on both T1- and T2-weighted IDEAL images (P < 0.05 for all). Conclusion: IDEAL technique improves image quality in the head and neck by reducing artifacts with homogeneous fat suppression, while maintaining a high SNR.

Keywords

References

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  1. Reply: vol.42, pp.2, 2016, https://doi.org/10.3174/ajnr.a6943