BACKGROUND: Coronary CT angiography allows visualization of the coronary arteries. However, motion artifact can impair delineation of the coronary artery lumen and detection of coronary artery stenoses. OBJECTIVE: We investigated the influence of heart rate and the segment of the cardiac cycle during which images are reconstructed on the occurrence of motion artifacts. METHODS: We evaluated coronary CT angiography datasets obtained by 64-slice dual-source CT in 100 consecutive patients. Data were reconstructed at 13 time instants during the cardiac cycle and evaluated for the presence of motion artifact. RESULTS: Mean heart rate was 66±14 beats/min. Overall, 98 of 100 patients had evaluable datasets. For heart rates ≤60 beats/min, optimal image quality was uniformly found during late diastole (100% of cases with evaluable image quality during a time window between 65% and 75% of the cardiac cycle). With increasing heart rates, images reconstructed during late systole more frequently provided best image quality. However, image reconstruction could not be restricted to a systolic time period. To achieve evaluable image quality in 95% of cases, data acquired between 25% and 75% of the cardiac cycle had to be available for patients with heart rates >60 beats/min. CONCLUSION: Dual-source CT provides high image quality across a wide range of heart rates. Although data acquisition may be limited to diastole for patients with heart rates ≤60 beats/min, the availability of data acquired both during systole and diastole is necessary for patients with higher heart rates. Copyright Â
BACKGROUND: Coronary CT angiography allows visualization of the coronary arteries. However, motion artifact can impair delineation of the coronary artery lumen and detection of coronary artery stenoses. OBJECTIVE: We investigated the influence of heart rate and the segment of the cardiac cycle during which images are reconstructed on the occurrence of motion artifacts. METHODS: We evaluated coronary CT angiography datasets obtained by 64-slice dual-source CT in 100 consecutive patients. Data were reconstructed at 13 time instants during the cardiac cycle and evaluated for the presence of motion artifact. RESULTS: Mean heart rate was 66±14 beats/min. Overall, 98 of 100 patients had evaluable datasets. For heart rates ≤60 beats/min, optimal image quality was uniformly found during late diastole (100% of cases with evaluable image quality during a time window between 65% and 75% of the cardiac cycle). With increasing heart rates, images reconstructed during late systole more frequently provided best image quality. However, image reconstruction could not be restricted to a systolic time period. To achieve evaluable image quality in 95% of cases, data acquired between 25% and 75% of the cardiac cycle had to be available for patients with heart rates >60 beats/min. CONCLUSION: Dual-source CT provides high image quality across a wide range of heart rates. Although data acquisition may be limited to diastole for patients with heart rates ≤60 beats/min, the availability of data acquired both during systole and diastole is necessary for patients with higher heart rates. Copyright Â
Authors: Stefan B Puchner; Maros Ferencik; Mihaly Karolyi; Synho Do; Pal Maurovich-Horvat; Hans-Ulrich Kauczor; Udo Hoffmann; Christopher L Schlett Journal: Int J Cardiovasc Imaging Date: 2013-08-30 Impact factor: 2.357
Authors: Jared D Christensen; Danielle M Seaman; Matthew P Lungren; Lynne M Hurwitz; Daniel T Boll Journal: Eur Radiol Date: 2014-02-28 Impact factor: 5.315
Authors: Peter Dankerl; Matthias Hammon; Hannes Seuss; Monique Tröbs; Annika Schuhbaeck; Michaela M Hell; Alexander Cavallaro; Stephan Achenbach; Michael Uder; Mohamed Marwan Journal: Int J Comput Assist Radiol Surg Date: 2016-09-07 Impact factor: 2.924
Authors: Cynthia K Rigsby; Sarah E McKenney; Kevin D Hill; Anjali Chelliah; Andrew J Einstein; B Kelly Han; Joshua D Robinson; Christina L Sammet; Timothy C Slesnick; Donald P Frush Journal: Pediatr Radiol Date: 2018-01-01