High-resolution 3D-GRE imaging of the abdomen using controlled aliasing acceleration technique - a feasibility study

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Medical Imaging Technology
• Radiology

Background:

• Standard 3D-gradient-recalled echo (GRE) T1-weighted imaging with conventional acceleration (GRAPPA-VIBE) is widely used for abdominal MRI.
• Assessing the feasibility and performance of advanced acceleration techniques is crucial for improving diagnostic accuracy and efficiency.

Purpose of the Study:

• To evaluate the feasibility of high-resolution 3D-GRE fat-suppressed T1-weighted MRI using CAIPIRINHA-VIBE.
• To compare image quality and lesion detection between CAIPIRINHA-VIBE and GRAPPA-VIBE.

Main Methods:

• Eighty-four patients underwent abdominal MRI at 1.5 T using both CAIPIRINHA-VIBE (0.76 mm resolution) and GRAPPA-VIBE (1.17 mm resolution).
• Two independent readers assessed image quality, artifacts, lesion conspicuity, and detection.
• Statistical analysis included Kappa statistic, Wilcoxon signed-rank test, and logistic regression.

Main Results:

• CAIPIRINHA-VIBE demonstrated significantly sharper images and improved lesion conspicuity pre- and post-contrast (p < 0.001).
• This technique reduced respiratory motion and residual aliasing artifacts but showed increased noise and inferior fat suppression.
• Post-contrast CAIPIRINHA-VIBE yielded superior image quality and a trend towards improved hepatic lesion detection.

Conclusions:

• High-resolution abdominal 3D-GRE fat-suppressed T1-weighted imaging with CAIPIRINHA-VIBE is clinically feasible.
• CAIPIRINHA-VIBE provides sharper images, better lesion conspicuity, and reduced artifacts compared to standard GRAPPA-VIBE.
• This advanced technique offers potential for improved diagnostic performance and reduced scan times, especially for patients with breath-holding difficulties.