On Dose Efficiency of Modern CT-scanners in Chest Scans

On Dose Efficiency of Modern CT-scanners in Chest Scans- a Prospective, Randomized Study

CT scans of the chest / thorax are of great importance both in the initial diagnosis and in the follow-up of pulmonary or thoracic diseases. As an example, CT angiography of the pulmonary arteries (CTPA) is worldwide considered to be gold standard test in patients with a suspicion for pulmonary embolism.

The aim of this study is to measure and compare dose efficiency of modern CT scanners for unenhanced and contrast-enhanced scan protocols of the chest/thorax. Patients who are referred for a CT of the chest/thorax will be randomly assigned to one of the three CT scanners currently in use at our institution.

Inclusion Criteria:

• patient is referred for an unenhanced CT OR contrast-enhanced CT of the chest/thorax confirmed by a board-certified radiologist ('justifying indication' according to German/European radiation protection law) AND
• patient is at least 18 years of age AND
• patient (is able to give informed consent and) has given informed consent.

Exclusion Criteria:

• high degree of medical urgency (i.e. patient cannot be consented for iv contrast according to routine procedures)
• known or suspected pregnancy, or lactating . contraindications for contrast agent (renal failure, allergy, hyperthyroidism)