Journal
JOURNAL OF CARDIOVASCULAR MAGNETIC RESONANCE
Volume 19, Issue -, Pages -Publisher
BIOMED CENTRAL LTD
DOI: 10.1186/s12968-017-0381-3
Keywords
Coronary MR angiography; Image navigators; Respiratory motion correction; Coronary artery disease
Funding
- Department of Health through the National Institute for Health Research (NIHR)
- Centre of Excellence in Medical Engineering - Welcome Trust and EPSRC [WT 088641/Z/09/Z]
- BHF Centre of Excellence (British Heart Foundation) [RE/08/03]
- British Heart Foundation [RG/12/1/29262] Funding Source: researchfish
- Engineering and Physical Sciences Research Council [EP/P007619/1] Funding Source: researchfish
- EPSRC [EP/P007619/1] Funding Source: UKRI
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Background: The use of coronary MR angiography (CMRA) in patients with coronary artery disease (CAD) remains limited due to the long scan times, unpredictable and often non-diagnostic image quality secondary to respiratory motion artifacts. The purpose of this study was to evaluate CMRA with image-based respiratory navigation (iNAV CMRA) and compare it to gold standard invasive x-ray coronary angiography in patients with CAD. Methods: Consecutive patients referred for CMR assessment were included to undergo iNAV CMRA on a 1.5 T scanner. Coronary vessel sharpness and a visual score were assigned to the coronary arteries. A diagnostic reading was performed on the iNAV CMRA data, where a lumen narrowing > 50% was considered diseased. This was compared to invasive x-ray findings. Results: Image-navigated CMRA was performed in 31 patients (77% male, 56 +/- 14 years). The iNAV CMRA scan time was 7 min: 21 s +/- 0 min: 28 s. Out of a possible 279 coronary segments, 26 segments were excluded from analysis due to stents or diameter less than 1.5 mm, resulting in a total of 253 coronary segments. Diagnostic image quality was obtained for 98% of proximal coronary segments, 94% of middle segments, and 91% of distal coronary segments. The sensitivity and specificity was 86% and 83% per patient, 80% and 92% per vessel and 73% and 95% per segment. Conclusion: In this study, iNAV CMRA offered a very good diagnostic performance when compared against invasive x-ray angiography. Due to the short and predictable scan time it can add clinical value as a part of a comprehensive CAD assessment protocol.
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