Electrocardiographically gated 16-section CT of the thorax: cardiac motion suppression.
Thirty patients underwent 16-section multi-detector row computed tomographic (CT) angiography of the thorax with retrospective electrocardiographic gating. Institutional review board approval was obtained for retrospective analysis of CT scan data and records; patient informed consent was not required. Images reconstructed at six different time points (0%, 20%, 40%, 50%, 60%, 80%) within the R-R interval on the electrocardiogram were analyzed by two radiologists for diagnostic quality, to identify suitable reconstruction intervals for optimal suppression of cardiac motion. Five regions of interest (left coronary artery, aortic root, ascending and descending aorta, pulmonary arteries) were evaluated. Best image quality was achieved by referencing image reconstruction to middiastole (50%-60%) for the left coronary artery, aortic root, and ascending aorta. The pulmonary arteries are best displayed during mid- to late diastole (80%).
Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
Lars K
LK
Hofmann
Kelly H
KH
Zou
Philip
P
Costello
U Joseph
UJ
Schoepf
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000784:Aortic Dissection / Q000000981:diagnostic imaging; D000792:Angiography / Q000379:methods*; D017545:Aortic Aneurysm, Thoracic / Q000000981:diagnostic imaging; D001027:Aortography; D017023:Coronary Angiography; D001026:Coronary Artery Bypass; D004562:Electrocardiography; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging; D013902:Radiography, Thoracic / Q000379:methods*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014654:Vascular Patency