Comparison of Image Quality Using Metal Artifact Reduction Magnetic Resonance Sequences at Different Static Magnetic Fields

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  • Otomo Saori
    Division of Clinical Radiology Service, Kyoto University Hospital
  • Sagawa Hajime
    Division of Clinical Radiology Service, Kyoto University Hospital

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  • 静磁場強度の異なるMR装置を用いたmetal artifact reduction magnetic resonance sequenceの画質比較
  • セイ ジバ キョウド ノ コトナル MR ソウチ オ モチイタ metal artifact reduction magnetic resonance sequence ノ ガシツ ヒカク

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Abstract

<p> Purpose: This study aims to optimize the selection of the magnetic resonance imaging (MRI) scanners and metal artifact reduction magnetic resonance sequence (MARS) in patients with metallic implants by comparing the image quality of MARS at different static magnetic fields. Method: A titanium alloy hip prostheses stem was covered with the pork phantom. Nifedipine 10 mg was placed as a simulated lesion near the hip joint of the phantom. T1-weighted imaging (T1WI) and short tau inversion recovery (STIR) were acquired at both 1.5T and 3T. Several techniques of high-bandwidth (High BW), view angle tilting (VAT), and compressed sensing and slice encoding for metal artifacts correction (CS-SEMAC) were compared. Artifacts, sharpness, and visibility of lesions were evaluated visually by five radiological technologists using the normalized-rank approach. Result: CS-SEMAC reduced metal artifacts but showed bad sharpness. CS-SEMAC at 3T was the best visibility of lesions. Conclusion: If lesion visibility is a priority, CS-SEMAC with 3T is recommended as the first choice.</p>

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