Using SEMAC at 3 T MR to evaluate spinal metallic implants and peripheral soft tissue lesions
Chun Xin1, Houdong Liu1, Shihong Li2
1School of Medical Imaging, Jiangsu Vocational College of Medicine, Yancheng.
Medicine
|June 23, 2020
Summary
Slice-encoding metal artifact correction (SEMAC) significantly reduces spinal metal artifacts on 3T MRI scans. This technique improves visualization of implants and soft tissue lesions, enhancing diagnostic accuracy.
Area of Science:
- Radiology and Medical Imaging
- Magnetic Resonance Imaging (MRI)
- Medical Physics
Background:
- Metal artifacts pose a significant challenge in MRI, particularly for spinal metallic implants.
- Evaluating surrounding soft tissue and lesions near metallic implants is crucial for patient management.
- High bandwidth (HiBW) sequences offer some artifact reduction but may not be sufficient.
Observation:
- Twenty-seven patients with spinal metallic implants were scanned using both SEMAC and HiBW sequences at 3T.
- Artifact size, peri-prosthetic soft tissue, and metal visualization were quantitatively and qualitatively assessed.
- Lesion signs in the soft tissues were reviewed by senior readers.
Findings:
- SEMAC demonstrated a significant reduction in artifact size (37% and 24% decrease) compared to HiBW.
- T1-weighted SEMAC sequences achieved the highest scores for metal prosthesis visualization.
- Short tau inversion recovery SEMAC sequences revealed more signs of soft tissue lesions than clinical HiBW sequences.
Implications:
- SEMAC is an effective technique for reducing metal artifacts in spinal MRI at 3T.
- This improved artifact reduction enhances the assessment of spinal metallic implants and surrounding soft tissues.
- SEMAC facilitates better detection and characterization of soft tissue lesions in the presence of metallic implants.
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