Time-efficient breath-hold abdominal MRI at 3.0 T

Area of Science:

• Magnetic Resonance Imaging
• Medical Physics

Background:

• Abdominal MRI requires high spatial resolution and coverage, ideally within a single breath-hold.
• High-power 3.0 Tesla (3.0 T) MRI is limited by specific absorption rate (SAR) regulations, impacting scan speed.
• Conventional MRI sequences adhere to long-term SAR limits, restricting acquisition efficiency.

Purpose of the Study:

• To enhance the time efficiency of high-power deposition abdominal MRI acquisitions at 3.0 T.
• To increase the number of acquired slices per unit time during breath-hold scans.

Main Methods:

• Optimized abdominal MRI sequences using a short-term 10-second time-average SAR criterion.
• Incorporated a delay time post-breath-hold to comply with long-term 6-minute time-average SAR regulations.
• Applied the strategy to 2D dual-echo gradient-recalled echo, single-shot fast spin-echo, and 3D steady-state free precession sequences.

Main Results:

• Achieved approximately a twofold increase in image acquisition time efficiency at 3.0 T.
• Demonstrated improved slice-per-unit-time for key abdominal MRI sequences.
• Observed a mild sensation of warmth in volunteers during the most SAR-intensive sequence (single-shot fast spin-echo).

Conclusions:

• The developed optimization strategy is vendor-neutral and implementable on various conventional MRI scanners.
• This approach successfully increases imaging efficiency while adhering to regulatory power deposition limits.
• The method offers a practical solution for faster abdominal MRI acquisition within breath-hold constraints.