Zero-TE MRI: principles and applications in the head and neck

Area of Science:

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

Background:

• Zero echo-time (ZTE) MRI is an advanced technique for imaging tissues with very short T2 relaxation times.
• Traditional MRI struggles with bone imaging due to its low signal, while CT uses ionizing radiation.
• ZTE MRI offers potential advantages like speed, silent operation, and artifact reduction.

Purpose of the Study:

• To review the imaging physics, practical limitations, and reconstruction methods of ZTE MRI.
• To discuss optimization strategies for ZTE neuroimaging of bone in the head and neck.
• To examine the clinical utility and applications of ZTE MRI in neuro-oncology and head/neck imaging.

Main Methods:

• Review of ZTE MRI pulse sequences, including ultrafast readouts for short-T2 tissues.
• Discussion of image acquisition, processing, segmentation, and synthetic CT generation for ZTE bone imaging.
• Analysis of artifact reduction and optimization techniques specific to ZTE neuroimaging.

Main Results:

• ZTE MRI enables visualization of cortical bone without ionizing radiation, presenting a viable alternative to CT.
• Optimization strategies enhance ZTE performance for head and neck bone imaging, addressing historical limitations.
• Demonstration of clinical utility in various head and neck pathologies, including malformations, trauma, tumors, and interventional procedures.

Conclusions:

• ZTE MRI is a promising, non-ionizing radiation technique for head and neck bone imaging.
• Optimized ZTE protocols can overcome challenges in neuroimaging, expanding its clinical applications.
• ZTE MRI offers a versatile tool for diagnosis, screening, and intervention in the head and neck.