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Improving Image Quality and Decreasing SAR With High Dielectric Constant Pads in 3 T Fetal MRI
Zhengyang Zhu1,2,3, Xunwen Xue1,2,3, Tang Tang1,2,3
1Department of Radiology, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing, Jiangsu, China.
Journal of Magnetic Resonance Imaging : JMRI
|January 21, 2025
Summary
A high dielectric constant (HDC) pad significantly improves 3T fetal MRI quality by increasing signal-to-noise ratio and contrast-to-noise ratio. The HDC pad also reduces specific absorption rate (SAR), enhancing safety and diagnostic confidence in clinical practice.
Area of Science:
- Medical Imaging
- Magnetic Resonance Imaging (MRI)
- Biomedical Engineering
Background:
- High magnetic fields in fetal MRI present challenges with image quality degradation due to dielectric artifacts.
- Elevated specific absorption rate (SAR) is another significant technical hurdle in 3T fetal MRI.
Purpose of the Study:
- To evaluate the effectiveness of a high dielectric constant (HDC) pad in improving image quality.
- To assess the potential of HDC pads in reducing SAR for 3T fetal MRI.
Main Methods:
- Prospective study involving 168 pregnant participants undergoing 3.0T fetal MRI.
- Utilized balanced steady-state free precession (bSSFP) and single-shot fast spin-echo (SSFSE) sequences.
- Quantitative and qualitative image quality assessments, including SNR, CNR, and radiologist evaluations, alongside SAR measurements.
Main Results:
- HDC pad use led to significant increases in SNR (up to 258.76%) and CNR (up to 459.55%).
- Overall image quality, reduction in dielectric artifacts, and diagnostic confidence showed significant improvement.
- Whole-body total SAR was substantially reduced (32.60% for bSSFP, 15.40% for SSFSE).
Conclusions:
- Incorporating an HDC pad in clinical settings can enhance fetal MRI image quality.
- HDC pads effectively reduce dielectric artifacts and lower SAR, improving patient safety.
- The HDC pad is a promising tool for optimizing 3T fetal MRI protocols.
