Related Experiment Video
Updated: Aug 19, 2025
Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation
Published on: January 7, 2021
Automated dynamic motion correction improves repeatability and reproducibility of myocardial blood flow
Justen Choueiry1,2, Neel P Mistry1,2, Rob S B Beanlands1,2
1Department of Medicine (Cardiology), University of Ottawa Heart Institute, 40 Ruskin Street, Ottawa, ON, K1Y 4W7, Canada.
Background:
Patient motion reduces the accuracy of PET myocardial blood flow (MBF) measurements. This study evaluated the effect of automatic motion correction on test-retest repeatability and inter-observer variability in a clinically relevant population.
Methods:
Patients with known or suspected CAD underwent repeat rest 82Rb PET scans within minutes as part of their scheduled rest-stress perfusion study. Two trained observers evaluated the presence of heart motion in each scan. Global LV and per-vessel MBF were computed from the dynamic rest images before and after automatic motion correction. Test-retest and inter-observer variability were assessed using intra-class correlation and Bland-Altman analysis.
Results:
140 pairs of test-retest scans were included, with visual motion noted in 18%. Motion correction decreased the global MBF values by 3.5% (0.80 ± 0.24 vs 0.82 ± 0.25 mL⋅min-1⋅g-1; P < 0.001) suggesting that the blood input function was underestimated in cases with patient motion. Test-retest repeatability of global MBF improved by 9.7% (0.25 vs 0.28 mL⋅min-1⋅g-1; P < 0.001) and inter-observer repeatability was improved by 7.1% (0.073 vs 0.079 mL⋅min-1⋅g-1; P = 0.012). There was a marked impact on both test-retest repeatability as well as inter-observer repeatability in the LCX territory, with improvements of 16.5% (0.30 vs 0.36 mL⋅min-1⋅g-1; P < 0.0000) and 18.4% (0.13 vs 0.16 mL⋅min-1⋅g-1; P < 0.001), respectively.
Conclusion:
Automatic motion correction improved test-retest repeatability and reduced differences between observers.
Insights
Automatic motion correction significantly enhances the accuracy of PET myocardial blood flow (MBF) measurements by improving test-retest repeatability and reducing inter-observer variability in patients with coronary artery disease.
Area of Science:
- Cardiovascular Imaging
- Nuclear Cardiology
Background:
- Patient motion during Positron Emission Tomography (PET) scans compromises the accuracy of myocardial blood flow (MBF) measurements.
- Accurate MBF assessment is crucial for diagnosing and managing coronary artery disease (CAD).
Purpose of the Study:
- To evaluate the impact of automatic motion correction on the test-retest repeatability and inter-observer variability of myocardial blood flow (MBF) measurements.
- To assess the effectiveness of motion correction in a clinical population undergoing cardiac PET scans.
Main Methods:
- Repeat rest 82Rb PET scans were acquired in patients with suspected CAD.
- Two observers assessed visual heart motion, and global and per-vessel MBF were calculated before and after automatic motion correction.
- Test-retest and inter-observer variability were analyzed using intra-class correlation and Bland-Altman methods.
Main Results:
- 18% of scans showed visual motion; automatic correction reduced global MBF values by 3.5%.
- Test-retest repeatability of global MBF improved by 9.7%, and inter-observer repeatability improved by 7.1%.
- Significant improvements in both test-retest and inter-observer repeatability were observed in the LCX territory.
Conclusions:
- Automatic motion correction effectively enhances the reliability of cardiac PET MBF measurements.
- This technique improves both the consistency of repeated measurements and agreement between different observers, particularly in specific coronary territories.
