TY - JOUR AN - 21 AU - Wu,W. AU - Budovec,J. AU - Foley,W.D. TI - Prospective and retrospective ECG gating for thoracic CT angiography: a comparative study. JO - AJR PY - 2009 VL - 193 SP - 955-963 M2 - 955 DO - 10.2214/AJR.08.2158 ER -