Ischemic Heart Disease
For CMR coronary angiography, data are typically obtained over several cardiac cycles. To freeze cardiac motion, it is desirable to obtain image data during a very short time period within each cycle.What would the optimal time for data collection be?
75 ms after the QRS
150 ms after the QRS
Correct answer is D.
Coronary motion is typically minimal during diastasis that occurs after rapid ventricular filling and before atrial filling, i.e., in mid diastole. End systole (typically occurring at 250–300 ms after the QRS) is another phase of relatively little cardiac motion [1, 2]. In certain individuals, and particularly those with fast heart rates and children, end systole may be more appropriate for coronary MR angiography, because, with tachycardia, the diastolic period, and particularly diastasis, significantly shortens. During the early phases of ventricular contraction (100–200 ms), there is fast displacement of...
KeywordsCorrect Answer Myocardial Viability Constrictive Pericarditis Dobutamine Echocardiography Infarct Territory
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