A flexible view ordering technique for high-quality real-time 2DFT MR fluoroscopy.

Area of Science:

• Medical Imaging
• Magnetic Resonance Imaging (MRI)
• Biomedical Engineering

Background:

• Real-time MRI requires high temporal resolution for dynamic processes.
• Gradient-echo pulse sequences can be improved with view sharing and central k-space oversampling.
• Current methods face limitations in balancing temporal resolution, latency, and consistency.

Purpose of the Study:

• To introduce and evaluate a method for tailoring view order to the reconstruction cycle in real-time MRI.
• To optimize apparent temporal resolution, display latency, dispersion, and frame-to-frame consistency.
• To demonstrate the feasibility of real-time MRI for dynamic physiological imaging.

Main Methods:

• Developed a method to synchronize k-space acquisition phase-encodes with the MRI reconstruction cycle.
• Implemented a reverse-centric view ordering within reconstruction intervals to minimize latency.
• Periodically updated high spatial frequencies to maintain spatial resolution.
• Synchronized acquisition and reconstruction to reduce dispersion and improve consistency.

Main Results:

• Achieved apparent temporal resolution matching the frame rate with significantly reduced phase-encodes (as few as one-fourth).
• Minimized display latency by acquiring high-energy views just before reconstruction.
• Maintained low and consistent dispersion through synchronized acquisition and reconstruction.
• Successfully demonstrated real-time MRI with pulsatile time-of-flight blood signal enhancement in human subjects.

Conclusions:

• The proposed method effectively enhances temporal resolution in real-time MRI.
• Optimized view ordering addresses key criteria for effective real-time imaging, including latency and consistency.
• This technique holds promise for advanced dynamic imaging applications, such as visualizing blood flow in humans.