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Electrocardiograph-independent, "wireless" cardiovascular cine MR imaging
R D White1, C B Paschal, M E Clampitt
1Department of Radiology, Cleveland Clinic Foundation, OH 44195.
Journal of Magnetic Resonance Imaging : JMRI
|May 1, 1991
Summary
A novel wireless gating technique for cardiac MRI, independent of electrocardiograms (ECG), proved diagnostic in 91% of cardiovascular disease cases. While image quality varied, this ECG-independent method shows promise for improved cardiac imaging.
Area of Science:
- Cardiovascular Imaging
- Magnetic Resonance Imaging
- Medical Technology
Background:
- Electrocardiograph (ECG)-dependent gating is standard for cardiac cine MRI.
- Limitations of ECG gating include signal interference and lead placement issues.
- Developing ECG-independent techniques offers potential for broader applicability.
Purpose of the Study:
- To evaluate a new wireless, ECG-independent gating technique for cine MR imaging.
- To compare the diagnostic performance and image quality of this novel technique against standard ECG-dependent methods.
- To identify technical limitations and potential improvements for the ECG-independent strategy.
Main Methods:
- A wireless, ECG-independent gating technique using a "double-section" method was developed.
- This method acquires simultaneous timing and imaging data, extracting "artificial R waves" from MR signal changes.
- The technique was evaluated in 23 cardiovascular disease cases with concurrent ECG-dependent imaging.
Main Results:
- The ECG-independent cine MR imaging loops were diagnostic in 91% of evaluated cases.
- Image quality was comparable to ECG-dependent methods in 39% of cases, rising to 53% when suboptimal orientations were excluded.
- Suboptimal imaging orientation and poor ventricular function were identified as key limitations.
Conclusions:
- The wireless, ECG-independent gating technique is a viable and diagnostic approach for cardiac cine MR imaging.
- Image quality is influenced by imaging orientation and cardiac function, suggesting areas for technical refinement.
- Future technical advancements are anticipated to enhance the performance of this ECG-independent strategy.