Related Experiment Videos
[MRI of the pulmonary parenchyma. Clinical value and research prospects]
Y Berthezène1, D Revel, K Bendib
1Service de Radiologie, Hôpital L-Pradel, Lyon.
Abstract:
MR imaging of the lung is handicapped by three negative influences. First, the low proton spin density in lung tissue results in a low signal-to-noise ratio relative to the surrounding structures. Second, cardiac and respiratory motion induce artifacts that tend to obscure fine structural detail in the lung. Third, a considerable magnetic susceptibility gradient, arising from the large surface areas of air and tissue interfaces, produces a very low value for T2*. MR imaging can be used to stage the activity of interstitial lung disease and for the diagnosis of lipoid pneumonia and pulmonary infarction. In combination with MR angiography, perfusion MR imaging might eventually become a test for pulmonary embolisms.
Insights
Magnetic resonance (MR) imaging of the lung faces challenges due to low signal, motion artifacts, and magnetic susceptibility. Despite limitations, MR imaging aids in diagnosing lung diseases like interstitial lung disease and pulmonary infarction.
Area of Science:
- Radiology
- Medical Imaging
- Pulmonary Medicine
Context:
- Magnetic Resonance (MR) imaging of the lung is significantly limited by inherent biophysical properties and physiological motion.
- Low proton density, physiological motion (cardiac and respiratory), and magnetic susceptibility gradients at air-tissue interfaces impede image quality and diagnostic accuracy.
- These factors contribute to a low signal-to-noise ratio and signal loss, particularly affecting T2* values.
Purpose:
- To review the challenges and potential applications of Magnetic Resonance (MR) imaging in pulmonary diagnostics.
- To highlight the technical limitations of lung MR imaging and explore its current and future clinical utility.
- To discuss the role of MR imaging in staging interstitial lung disease and diagnosing specific pulmonary conditions.
Summary:
- MR imaging of the lung is hampered by low signal-to-noise ratio due to low proton density, motion artifacts from cardiac and respiratory cycles, and magnetic susceptibility gradients at air-tissue interfaces, leading to low T2* values.
- Despite these challenges, MR imaging is valuable for staging interstitial lung disease and diagnosing conditions such as lipoid pneumonia and pulmonary infarction.
- Future applications may include using perfusion MR imaging in conjunction with MR angiography for diagnosing pulmonary embolisms.
Impact:
- Provides a concise overview of the technical hurdles in lung MR imaging.
- Identifies current diagnostic applications for interstitial lung disease, lipoid pneumonia, and pulmonary infarction.
- Suggests future potential for MR imaging in diagnosing pulmonary embolism, enhancing non-invasive lung assessment.