Brilliance ict

CTA, ETT, stress echocardiography, and exercise or pharmacologic nuclear stress testing were performed by local physicians in accordance with professional society guidelines. Electrocardiography (ECG)-gated CTA was performed on single or dual source CT scanners with at least 64 slices.^{8 (link), 9 (link)} For nuclear stress testing, the imaging protocol and administered agent were recorded; for CTA, the CT scanner model and whether a prospective or retrospective ECG-triggered or gated protocol was used were recorded. “Advanced” CT scanners were defined as 64+ slice CT scanners that were each of the 4 largest vendors’ newest model during the study period (GE Discovery CT750 HD, Philips Brilliance iCT, Siemens Definition Flash, Toshiba Aquilion ONE), with all other CT scanners considered “standard.” At the beginning of the trial, sites completed surveys in which they reported their annual volume of nuclear stress and CTA testing as a measure of their experience.

Electrocardiogram-gated CTA had been performed on CT scanners with at least 64 detector rows (10 (link)). “Advanced” scanners were defined as each manufacturer’s most advanced model available during the trial (General Electric HD 750, Phillips Brilliance iCT, Siemens SOMATOM Definition Flash, Toshiba Aquilion One). CTA was interpreted for stenosis by local physicians who made all clinical decisions. Severe stenosis, defined as an anatomic stenosis of ≥50% in the left main or ≥70% in other major epicardial coronary arteries, constituted a per-patient “positive” CTA result.