MIRA2015 Lecture Notes - Lecture 6: Coronary Circulation, Diastole, University Of Manchester

• School: Curtin University
• Department: Medical Imaging, Radiology & Radiography
• Course: MIRA2015
• Professor: Cat Kealley

Document Summary

Having to acquire images in a rapidly beating heart, thus requiring that the imaging modality should provide high temporal resolution. To freeze the heart motion in order to image coronary arteries located close to heart muscles because these muscles show rapid movement during the cardiac cycle. Diagram shows the range of diastolic regions for varying heart rates. The desired temporal resolution for cardiac ct is approximately 250 msec for average heart rate of less than 70 beats per minute. For higher heart rates, the desired temporal resolution is. Electrocardiogram (ecg) gating: ecg is recorded during scanning because image acquisition and reconstruction are synchronised with the heart motion. Ecg: stops motion imaging by acquiring data only during specified portion of the cardiac cycle which is diastole. Cardiac ct should also provide high spatial resolution to resolve very fine structures such as proximal coronary segments that run in all direction around the heart.