Improvement of Fat Suppression and Artifact Reduction Using IDEAL Technique in Head and Neck MRI at 3T
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Purpose: To quantitatively and qualitatively compare fat-suppressed MRI qualityusing iterative decomposition of water and fat with echo asymmetry and leastsquaresestimation (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 andFSFS were compared. Visual assessment was performed by two independent readerswith respect to; 1) metallic artifacts around oral cavity, 2) susceptibility artifactsaround upper airway, paranasal sinus, and head-neck junction, 3) homogeneity of fatsuppression, 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 reducedartifacts around airway, paranasal sinus, and head-neck junction, and significantlyimproved homogeneous fat suppression in compared to those using FSFS (P < 0.05for all). IDEAL significantly decreased artifacts around oral cavity on T2-weightedimages (P < 0.05, respectively) and improved sharpness, lesion-to-tissue, and lymphnode-to-tissue contrast on T1-weighted images (P < 0.05 for all). The mean SNRswere significantly improved on both T1- and T2-weighted IDEAL images (P < 0.05 forall). Conclusion: IDEAL technique improves image quality in the head and neck byreducing artifacts with homogeneous fat suppression, while maintaining a high SNR.
Abstract
Purpose: To quantitatively and qualitatively compare fat-suppressed MRI qualityusing iterative decomposition of water and fat with echo asymmetry and leastsquaresestimation (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 andFSFS were compared. Visual assessment was performed by two independent readerswith respect to; 1) metallic artifacts around oral cavity, 2) susceptibility artifactsaround upper airway, paranasal sinus, and head-neck junction, 3) homogeneity of fatsuppression, 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 reducedartifacts around airway, paranasal sinus, and head-neck junction, and significantlyimproved homogeneous fat suppression in compared to those using FSFS (P < 0.05for all). IDEAL significantly decreased artifacts around oral cavity on T2-weightedimages (P < 0.05, respectively) and improved sharpness, lesion-to-tissue, and lymphnode-to-tissue contrast on T1-weighted images (P < 0.05 for all). The mean SNRswere significantly improved on both T1- and T2-weighted IDEAL images (P < 0.05 forall). Conclusion: IDEAL technique improves image quality in the head and neck byreducing artifacts with homogeneous fat suppression, while maintaining a high SNR.
참고문헌 (29)
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