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Evaluation of myocardial motion tracking with cine-phase contrast magnetic resonance imaging
1Department of Radiology, Stanford University School of Medicine, California, USA.
Rationale And Objectives:
The accuracy of myocardial motion measurements, computed from cine-phase contrast (cine-PC) magnetic resonance (MR) velocity data, was compared with directly visualized motion of MR signal voids caused by implanted tantalum markers in anesthetized dogs.
Methods:
Magnetic resonance imaging (MRI) data were electrocardiogram-gated and divided into 16 phases per cardiac cycle. Myocardial trajectories as a function of time in the cardiac cycle were measured using both methods for four to seven markers in each of eight animals.
Results:
The peak observed in-plane excursion was 4.0 +/- 2.1 mm. The average deviation between displacements derived from velocity data versus displacements visualized directly was 1.1 +/- 0.7 mm (27.5% of the peak displacement). The difference was less if three separate MR scans were used to measure each velocity component in the cine-PC method. This improvement is probably caused by improved temporal resolution.
Conclusions:
Cine-PC MRI offers a noninvasive method for accurate quantification of myocardial motion.
Insights
Cine-phase contrast magnetic resonance imaging (cine-PC MRI) accurately quantifies myocardial motion. This noninvasive technique shows good agreement with direct visualization of implanted markers in dogs.
Area of Science:
- Cardiovascular Imaging
- Biomedical Engineering
- Animal Research
Background:
- Myocardial motion quantification is crucial for diagnosing cardiac conditions.
- Accurate assessment of heart muscle movement aids in understanding cardiac mechanics.
- Noninvasive imaging techniques are preferred for patient safety and repeated measurements.
Purpose of the Study:
- To compare the accuracy of myocardial motion measurements derived from cine-phase contrast (cine-PC) magnetic resonance (MR) velocity data.
- To validate cine-PC MRI against direct visualization of implanted tantalum markers in canine subjects.
Main Methods:
- Magnetic resonance imaging (MRI) data were acquired using electrocardiogram-gating.
- Myocardial trajectories were analyzed at 16 phases per cardiac cycle.
- Displacements were measured using cine-PC velocity data and direct visualization of MR signal voids from implanted markers in eight dogs.
Main Results:
- The average deviation between cine-PC derived displacements and direct visualization was 1.1 +/- 0.7 mm (27.5% of peak displacement).
- Improved accuracy was observed when using three separate MR scans per velocity component, suggesting enhanced temporal resolution benefits.
- Peak in-plane excursion measured was 4.0 +/- 2.1 mm.
Conclusions:
- Cine-PC MRI provides a noninvasive and accurate method for quantifying myocardial motion.
- The findings support the use of cine-PC MRI in clinical settings for assessing cardiac function.
- Further optimization of temporal resolution may improve the precision of cine-PC MRI measurements.