What Student Need to Know about Contrast technique used for cardio vascular system In RadioDiagnosis

The indication to perform a chest CT can be clinical, or based on an abnormality on prior imaging studies such as chest radiograph (CXR), fluoroscopy, MRI or abdomen CT. In almost all clinical scenarios, chest radiograph should be performed initially. Findings on CXR would help to tailor the appropriate CT examination. Broadly, the protocols may be divided into non-contrast CT (NCCT), contrast-enhanced CT (CECT) and then multiple modifications are available within this basic framework. There are certain aspects of CT acquisition, though, which are common amongst all the protocols. Currently, all thoracic CT scans should be acquired in volumetric mode in full inspiration. Sequential mode may be used while acquiring limited expiratory scans. Certain clinical situations mandate the use of intravenous (IV) contrast such as evaluation of pyrexia of unknown origin (PUO) or acute infections. Omission of contrast in such scenarios can lead to inadequate evaluation of critical findings like mediastinal lymph nodes