Oral Abstract Session 04: Early Career Awards 3: Basic Science (2018)-A quantitative comparison of navigator-gated Cartesian and self-navigated radial free-breathing 3D bSSFP whole-heart coronary MRA

A quantitative comparison of navigator-gated Cartesian and self-navigated radial free-breathing 3D bSSFP whole-heart coronary MRA

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Video Summary

This study directly compared navigator-gated Cartesian coronary MRA with self-navigated radial coronary MRA in 16 healthy volunteers at 1.5T. Both used free-breathing, ECG-triggered, non-contrast imaging. Self-navigation was nearly three times faster and produced more homogeneous blood pool signal, while navigator gating yielded significantly sharper coronary vessels. Visible vessel length was similar between methods. The authors concluded that each technique has strengths and weaknesses: self-navigation improves efficiency, but navigator gating still offers better vessel sharpness and predictable clinical workflow. Future work may combine both advantages through newer motion-correction and motion-resolved reconstruction methods.

Keywords

navigator-gated coronary MRA

self-navigated radial MRA

free-breathing ECG-triggered imaging

coronary vessel sharpness

motion-correction reconstruction