Related Experiment Video
Updated: Jul 29, 2025
Author Spotlight: Standardization and Best Practices for Advancing Lung Imaging Using 129Xe MRI
Published on: November 21, 2023
Comparison of ventilation defects quantified by Technegas SPECT and hyperpolarized 129Xe MRI
Nisarg Radadia1, Yonni Friedlander2,3, Eldar Priel2,4,5
1Division of Respirology, Department of Medicine, McMaster University, Hamilton, ON, Canada.
Ventilation defect percent (VDP) measured by Technegas SPECT and hyperpolarized 129Xe MRI are comparable, especially in patients with COPD. Both imaging methods show higher VDP in those with COPD, correlating with reduced lung function.
Area of Science:
- Pulmonary Medicine
- Medical Imaging
- Radiology
Background:
- Ventilation imaging is crucial for assessing lung function, particularly before lung cancer resection.
- Technegas SPECT and hyperpolarized 129Xe MRI are ideal contrast agents for ventilation imaging but have not been directly compared.
- Comparing these modalities is essential for understanding their clinical utility in patients with and without obstructive lung disease.
Purpose of the Study:
- To compare the ventilation defect percent (VDP) assessed by Technegas SPECT and hyperpolarized 129Xe MRI.
- To evaluate the correlation and agreement between these two imaging modalities in patients undergoing lung cancer resection.
- To assess the impact of obstructive lung disease on VDP measurements from both modalities.
Main Methods:
- Forty-one adult patients scheduled for lung cancer resection underwent same-day Technegas SPECT, hyperpolarized 129Xe MRI, spirometry, and DLCO measurements.
- Ventilation abnormalities were quantified using two methods: adaptive thresholding (VDP_T) and k-means clustering (VDP_K).
- Spearman correlation and Bland-Altman analysis were used to determine correlation and agreement between the modalities.
Main Results:
- VDP measurements from Technegas SPECT and 129Xe MRI showed significant correlation (VDP_T: r=0.48, p=0.001; VDP_K: r=0.63, p<0.0001).
- Higher VDP correlated with lower FEV1/FVC and DLCO for both modalities.
- VDP was significantly higher in participants with COPD compared to those with asthma or no obstructive lung disease for both SPECT and MRI.
Conclusions:
- Quantitative assessment of ventilation defects by Technegas SPECT and 129Xe MRI is comparable, despite differences in imaging techniques.
- Both modalities effectively identify increased ventilation defects in patients with COPD.
- These findings support the clinical utility of both Technegas SPECT and 129Xe MRI for evaluating ventilation abnormalities in lung cancer patients.
More Related Videos
08:23Author Spotlight: Advancing Lung Disease Research with Free-Breathing Hyperpolarized Xenon-129 MRI
Published on: November 10, 2023
02:09Multi-modal Pulmonary Imaging: Using Complementary Information from CT and Hyperpolarized 129Xe MRI to Evaluate Lung Structure-Function
Published on: April 12, 2024
Related Concept Videos
01:30Radiological Investigation II: MRI and Ventilation Perfusion Scan
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
01:13Radiological Investigation III: Pulmonary Angiogram and PET Scan
Pulmonary Angiogram
A Pulmonary Angiogram is an invasive procedure involving injecting a contrast medium through a catheter threaded into the pulmonary artery or the right side of the heart to visualize the pulmonary vasculature. Computed Tomography (CT) scans have mainly replaced this...