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Pulmonary disorders: ventilation-perfusion MR imaging with animal models
1Dept of Radiology, Beth Israel Deaconess Medical Center, Boston, MA 02215 USA. qchen@caregroup.harvard.edu
Radiology
|December 2, 1999
Summary
Magnetic resonance (MR) imaging effectively assesses regional pulmonary ventilation and perfusion. This technique accurately identifies abnormalities in lung function, aiding in the evaluation of lung diseases.
Area of Science:
- Pulmonary imaging
- Medical physics
- Cardiopulmonary diagnostics
Background:
- Assessing regional pulmonary ventilation and perfusion is crucial for diagnosing lung diseases.
- Traditional methods may lack the spatial and temporal resolution to fully characterize functional impairments.
Purpose of the Study:
- To demonstrate the capability of magnetic resonance (MR) imaging to assess regional pulmonary ventilation and perfusion.
- To utilize animal models of airway obstruction and pulmonary embolism to validate MR imaging techniques.
Main Methods:
- Airway obstruction was induced using a balloon catheter in a secondary bronchus.
- Pulmonary emboli were created by injecting thrombi into the inferior vena cava.
- Regional ventilation was assessed using 100% oxygen as a T1 contrast agent, and perfusion was assessed using gadolinium-enhanced MR angiography with a fast low-angle shot (FLASH) sequence.
Main Results:
- Matched ventilation and perfusion abnormalities were observed in all animals with induced airway obstruction.
- Pulmonary embolism models showed MR perfusion defects without corresponding ventilation abnormalities.
Conclusions:
- Ventilation and perfusion MR imaging provide high-resolution regional pulmonary functional information.
- MR imaging's ability to assess the magnitude and distribution of pulmonary functional impairment can significantly impact lung disease evaluation.