Innovative 4D FreeBreathing technique in pediatric abdominal MRI improves feasibility and image quality

Area of Science:

• Radiology
• Pediatric Imaging
• Magnetic Resonance Imaging

Background:

• Dynamic abdominal MRI in pediatric patients presents challenges due to motion artifacts and patient cooperation.
• Conventional T1w sequences often require breath-holding, which is difficult for young children.

Purpose of the Study:

• To compare the feasibility and imaging quality of a novel 4D FreeBreathing MRI sequence against a conventional dynamic breath-hold T1w sequence in pediatric abdominal MRI.
• To evaluate the performance of the 4D FreeBreathing sequence against a non-dynamic 3D T1w Vane mDixon acquisition.

Main Methods:

• Fifty pediatric patients underwent abdominal MRI, with 25 using the 4D FreeBreathing sequence and 25 using a conventional dynamic T1w sequence.
• Image quality was subjectively assessed by two radiologists on a 5-point scale.
• Signal-to-noise ratios (SNRart, SNRpv) and interobserver agreement were evaluated.

Main Results:

• The 4D FreeBreathing sequence demonstrated significantly higher SNRart and SNRpv (p < 0.001).
• Diagnostic image quality improved from 77.6% to 89.6%, and respiratory artifacts decreased from 22.4% to 10.4%.
• Image quality was comparable to the non-dynamic 3D T1w Vane mDixon sequence.

Conclusions:

• The 4D FreeBreathing technique is a feasible and effective method for dynamic pediatric abdominal MRI, offering improved image quality.
• This free-breathing approach enhances diagnostic accuracy and patient experience by eliminating the need for breath-holding.
• The 4D FreeBreathing sequence provides equivalent image quality to post-contrast 3D T1w Vane mDixon acquisitions.