MR Perfusion Imaging of the Lung

Area of Science:

• Radiology
• Pulmonary Medicine
• Medical Imaging

Background:

• Lung perfusion assessment is vital for diagnosing and monitoring respiratory diseases.
• Magnetic Resonance Imaging (MRI) offers a radiation-free alternative for lung imaging, particularly beneficial for pediatric patients requiring longitudinal monitoring.
• Existing imaging modalities have limitations, necessitating advanced techniques for comprehensive lung evaluation.

Purpose of the Study:

• To review the techniques and applications of MRI perfusion for assessing lung function.
• To highlight the potential of various MRI perfusion methods, including contrast-enhanced (CE) and non-contrast-enhanced (non-CE) approaches.
• To discuss the current challenges and future directions for clinical adoption of MRI perfusion.

Main Methods:

• Review of contrast-enhanced (CE) MRI techniques.
• Exploration of non-CE MRI perfusion methods: arterial spin labeling (ASL), fourier decomposition (FD), and hyperpolarized 129-Xenon (129-Xe) MRI.
• Analysis of clinical applications and validation status in various lung diseases.

Main Results:

• ASL provides non-invasive lung perfusion measurement using endogenous water.
• FD enables simultaneous lung perfusion and ventilation mapping.
• Hyperpolarized 129-Xe MRI shows potential for regional gas exchange assessment.
• MRI perfusion has shown promising results in cystic fibrosis and lung cancer.
• Further validation is needed for chronic obstructive pulmonary disease (COPD) and other conditions.

Conclusions:

• MRI perfusion techniques offer a comprehensive, non-invasive approach to lung function and perfusion assessment.
• Technological advancements, collaborative research, and rigorous validation are essential for broader clinical adoption.
• MRI perfusion holds significant potential to improve the diagnosis and management of diverse respiratory conditions.