Ultra Low Dose CT and Use of Iomeron 400 in PCD-CT

This study is testing whether ultra-low-dose CT scans — which use much less radiation than standard CT — combined with a specific contrast agent (Iomeron 400) can produce high-quality images using new photon-counting detector CT (PCD-CT) technology. The goal is to detect lung nodules and pneumonia with less radiation exposure. **You may be eligible if...** - You are 18 or older - You have been referred for a CT scan to evaluate a lung nodule or check for pneumonia - Your BMI is 30 or below **You may NOT be eligible if...** - You are under 18 years old - Your BMI is over 30 Talk to your doctor to see if this trial is right for you.