Pulmonary Structural MRI using Free-Breathing, Self-Gated Ultra-short Echo Time Imaging

Area of Science:

• Radiology
• Medical Imaging
• Pulmonary Medicine

Background:

• High-quality lung MRI is difficult due to low tissue density, rapid signal decay, and motion.
• Computed Tomography (CT) is standard but uses ionizing radiation, limiting its use in pediatrics and research.
• Ultra-short echo time (UTE) MRI is an emerging alternative for lung imaging.

Purpose of the Study:

• To present a simple, robust, and efficient protocol for acquiring high-quality UTE MRI of the lungs.
• To enable self-gated image reconstruction for distinct respiratory phases.
• To provide an alternative to CT for lung imaging, especially for radiation-sensitive groups.

Main Methods:

• Developed a protocol for 3D radial UTE MRI acquisition at 3T.
• Implemented self-gating using respiratory motion information encoded during free-breathing scans (~5-10 min).
• Included recommended parameter settings and reconstruction directions for self-gated imaging.

Main Results:

• Achieved high-resolution UTE lung MRI with minimal motion artifacts.
• Demonstrated the feasibility of generating images at distinct respiratory phases.
• The protocol is computationally efficient and simplifies image acquisition.

Conclusions:

• The presented UTE MRI protocol provides high-quality, artifact-minimized lung imaging.
• This method serves as a viable, radiation-free alternative to CT for evaluating pulmonary structure.
• Applicable for research in various pulmonary conditions and in vulnerable patient populations.