• Radiation dose estimates of coronary MSCT angiography in daily practice [ Time Frame: 1 month ] [ Designated as safety issue: No ]
  

• Comparison of dose estimates between 16-slice, 64-slice, DSCT and other CT systems [ Time Frame: 1 month ] [ Designated as safety issue: No ]
  
• Frequency of dose-saving algorithm's use (e.g.: ECG-dose pulsing / Care Dose 4D / 100kv [ Time Frame: 1 month ] [ Designated as safety issue: No ]
  
• Assessment of potentials for additional dose savings (e.g. entire scan length; the distance between scan start to begin of coronary arteries and distance end of coronary arteries to end of scan) [ Time Frame: 1 month ] [ Designated as safety issue: No ]
  

Prospective analysis of cardiac CT angiographies enrolled over 1 month

Collection of 1 axial data set and the "patient dose protocol" (including kV, mAs, CTDI, DLP, etc.) on a CD

Dose estimation in dose/cm with the use of a method proposed by the European Working Group for Guidelines on Quality Criteria in CT.

Assessment of diagnostic, qualitative image quality on a per-vessel basis by the participating study sites and in randomly selected cases by the primary study investigators (approximately 5-10% of patients to "spot check" interobserver variability of image quality assessments)

Assessment of image quality with the use of quantitative parameters including image noise, signal-to-noise and contrast-to-noise ratios

patients with indication for cardiac imaging by MSCT

Inclusion Criteria:

• assessment of coronary arteries
• acute chest pain or "triple rule out"
• evaluation after PCI (stents)
• evaluation of bypass grafts
• before or after EP study
• cardiac anomalies

Exclusion Criteria:

• pregnancy
• contraindications against contrast media