A Modified Propeller Sequence For MR Image Metal Artifact Reduction
Abstract:
Magnetic resonance imaging (MRI) quality is often degraded by motion-induced artifacts, signal loss, and metal-related phase accumulation artifacts. This study aimed to improve MRI image quality by addressing these challenges. We modified the widely used periodically rotated overlapping parallel lines with enhanced reconstruction (Propeller) sequence based on fast spin echo (FSE) by incorporating a compensation gradient along the slice selection direction during readout, achieving a tilted field of view angle. This approach stretched and unfolded stacked signals, effectively reducing metal artifacts by adjusting the gradient fields to correct phase errors. Phantom tests and in-vivo experiments showed that the modified Propeller sequence effectively reduced metal-induced artifacts and mitigated the effects of both metal and motion on image quality. The proposed approach not only improved overall image quality but also increased the scan success rate, possessing notable clinical significance.
Insights
This study improved Magnetic Resonance Imaging (MRI) quality by modifying the Propeller sequence to reduce metal and motion artifacts. The enhanced sequence significantly decreased artifacts, improving scan success and image clarity.
Area of Science:
- Medical Imaging
- Biophysics
Background:
- Magnetic Resonance Imaging (MRI) quality is frequently compromised by artifacts.
- Metal implants and patient motion are significant sources of image degradation, leading to signal loss and phase errors.
Purpose of the Study:
- To enhance MRI image quality by reducing artifacts caused by metal and motion.
- To develop a modified Propeller sequence for improved artifact correction.
Main Methods:
- Modified the standard Fast Spin Echo (FSE)-based Propeller sequence.
- Incorporated a compensation gradient along the slice selection direction during readout.
- Achieved a tilted field of view to unfold stacked signals and correct phase errors.
Main Results:
- The modified Propeller sequence effectively reduced metal-induced artifacts.
- Mitigated the combined effects of metal and motion on MRI image quality.
- Demonstrated improved image quality and increased scan success rates in phantom and in-vivo tests.
Conclusions:
- The modified Propeller sequence offers a robust solution for reducing common MRI artifacts.
- This technique shows significant clinical potential for improving diagnostic accuracy in challenging imaging scenarios.
- The approach enhances overall MRI quality and scan reliability.
