Contrast Media in PET/ Computed Tomography Imaging

摘要

Contrast agents are usually given orally or intravenously.Intravenous contrast agents are usually iodine based (ionic and nonionic), and oral contrast agents can be grouped into positive and negative agents.State-of-the-art diagnostic PET/computed tomography (CT) scan with intravenous or oral contrast gives excellent anatomic details as well as information on tumor vascularization and reduces the need for additional contrast-enhanced diagnostic imaging modalities.Contrast agents (especially positive oral contrast agents) in PET/CT may lead to overestimation of PET attenuation factors; however, this increase/overestimation of standardized uptake value is clinically insignificant.Use of positive oral contrast agents should be limited to patients in whom the pathologic abnormality or site of suspected disease is in the gastrointestinal tract or abdomen.