Abstract
Objective To quantify periods of low motion of the coronary veins in patients with low and moderate EF in order to optimize acquisition of whole-heart coronary magnetic resonance venograms (cMRV). Background Three-dimensional, whole-heart, navigator-gated, contrast-enhanced MRI techniques are used to acquire cMRVs which can be used for planning lead placement in cardiac resynchronization therapy (CRT). In order to reduce cardiac motion artifacts, it is desirable to set the trigger delay time to acquire image data only during periods of low vessel motion, typically assumed to be during diastole. By knowing the temporal length and location of the low motion period, the acquisition window can be optimized for coronary vein imaging. Previous studies have examined coronary artery motion, but an analysis of the coronary veins has not been performed. Methods 32 total patients were analyzed. These patients were considered in 3 groups: 13 patients scheduled for CRT (LVEF 120ms), 6 patients with low LVEF but normal ECG (LVEF 35%, QRS 35%) had a longer diastolic rest period, 3) 4 patients with a longer systolic rest period had no diastolic rest period.
Highlights
Three-dimensional, whole-heart, navigator-gated, contrast-enhanced MRI techniques are used to acquire coronary magnetic resonance venograms (cMRV) which can be used for planning lead placement in cardiac resynchronization therapy (CRT)
The coronary sinus was visible in the two-chamber cine images in all patients. 38% of the patients had systolic rest period and 62% had a diastolic rest period
The major findings of this study were: 1) 95% of patients with LVEF35%) had a longer diastolic rest period, 3) 4 patients with a longer systolic rest period had no diastolic rest period
Summary
Three-dimensional, whole-heart, navigator-gated, contrast-enhanced MRI techniques are used to acquire cMRVs which can be used for planning lead placement in cardiac resynchronization therapy (CRT). In order to reduce cardiac motion artifacts, it is desirable to set the trigger delay time to acquire image data only during periods of low vessel motion, typically assumed to be during diastole. By knowing the temporal length and location of the low motion period, the acquisition window can be optimized for coronary vein imaging. Previous studies have examined coronary artery motion, but an analysis of the coronary veins has not been performed. Based on the ratio of systolic to diastolic low motion period durations, patients were classified as either having a systolic or diastolic rest period
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