Water-saturated three-dimensional balanced steady-state free precession for fast abdominal fat quantification

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Medical Imaging Technology
• Quantitative Analysis

Background:

• Abdominal fat quantification is crucial for metabolic and cardiovascular health assessment.
• Conventional T1-weighted turbo spin echo (T1W TSE) sequences are widely used but have limitations in speed and motion artifact sensitivity.
• Developing advanced MRI sequences is essential for improving diagnostic accuracy and efficiency.

Purpose of the Study:

• To evaluate the performance of a novel water-saturated balanced steady-state free precession (b-SSFP) sequence for abdominal fat quantification.
• To compare its accuracy and efficiency against the conventional T1W TSE sequence.

Main Methods:

• A water-saturated, segmented, three-dimensional b-SSFP sequence and a T1W TSE sequence were applied to phantom and human studies.
• Phantom studies involved a dual-layered phantom with known oil volumes.
• Human studies included six volunteers scanned at the L2-L3 levels, with signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) calculated.

Main Results:

• Phantom studies demonstrated that water-saturated b-SSFP provided significantly more accurate estimations of oil volumes and volume ratios compared to T1W TSE (P < 0.0001).
• Human studies showed that 3D water-saturated b-SSFP images yielded higher CNR (P < 0.0005) and comparable SNR(fat) (P = 0.045) to T1W TSE.
• The novel sequence achieved these results in a shorter scan duration.

Conclusions:

• The 3D water-saturated b-SSFP sequence generates high-quality abdominal fat images with excellent CNR and SNR.
• It offers a faster and more robust alternative to T1W TSE for abdominal fat quantification.
• This sequence is less susceptible to flow and motion artifacts, enhancing its reliability in clinical settings.