1. Dose Reduction by new scanner (Time Frame - through study completion, an average of 1 year): mSv per exam will be recorded. This value will be put in correlation to weight (Kg), height (cm) and BMI.
2. stable Image Quality in reduced dose scans (Time Frame - through study completion, an average of 1 year): Recorded values compared in 2 populations-different contrast agents by using qualitative&quantitative methods Qualitative:diagnostic certainty, assessability of lung structure/lesions,diagnostic reliability,
Quantitative:Assessment of tissue composition,diagnostic performance measurements Attenuation/sealing measurement (HU), signal-to-noise ratio (SNR), contrast-to-noise ratio ,size dimensions of lung structure/lesion in three dimensions in millimeters Tissue composition assessment diagnostic performance measurements (sensitivity, specificity, accuracy) diagnostic confidence: 1-4
Theses measurements will be put in correlation to the scan dose (mSv) per patient, forming two groups with matched BMI (kg/m^2)
