Heart performed with ECG gating and retrospective post processing. CTA parameters: 16 ?0.75mm collimation, 400ms gantry rotation, pitch of 0.298, tube voltage at 120kV, maximum current of 600--800 mAs depending on patient size, half-scan reconstruction mode and imaging craniocaudal direction. All patients received 5mg of sublingual isosorbide dinitrate 5 minutes before CTA acquisition. Patients wi