Magnetic resonance imaging in real time: advances using radial FLASH

Area of Science:

• Medical Imaging
• Biophysics
• Radiology

Background:

• Real-time magnetic resonance imaging (MRI) is crucial for visualizing dynamic physiological processes.
• Current MRI techniques often face limitations in achieving both high image quality and high temporal resolution simultaneously.

Purpose of the Study:

• To advance real-time MRI technology for enhanced image quality and frame rates.
• To develop a versatile MRI approach applicable to various clinical scenarios.

Main Methods:

• Utilized fast low-angle shot (FLASH) MRI sequences combined with radial data sampling and view sharing.
• Employed gridding reconstructions to eliminate artifacts and enable adjustable spatial-temporal resolution trade-offs.
• Implemented immediate image reconstruction and online display on an unmodified 3 Tesla (3T) MRI system, incorporating principal component analysis-based channel compression for multi-element coils.

Main Results:

• Demonstrated visualization of continuous temporomandibular joint movements during mouth articulation with 0.75 mm in-plane spatial resolution.
• Successfully monitored cardiac functions at a temporal resolution of 20 images per second during free breathing, independent of electrocardiogram synchronization.
• Preliminary applications in healthy volunteers showcased the technique's capability for high-resolution dynamic imaging.

Conclusions:

• Real-time radial FLASH MRI presents a straightforward and adaptable tool for diverse clinical applications.
• The developed technique overcomes previous limitations in dynamic MRI, offering improved performance for both spatial and temporal resolution.
• This advancement holds significant potential for enhancing diagnostic capabilities in various medical fields.