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A non-contrast CT scan is a kind of computed tomography scan which is carried out without using a special dye meant to make organs more prominent. CT scans can be done with or without contrast, determined by the medical circumstances of each different case.
Noncontrast-enhanced CT of the head is the preferred initial study if performed within three hours of acute symptom onset; contrast-enhanced CT should be obtained for patients with symptoms...
Almost always, CTs should be ordered with or without contrast, not both. Here is an overview of the indications for contrasted CT: Orbits – Infection, mass. Neck – Mass, adenopathy. Chest – Mass, cancer/metastatic workup, lymphoma, sarcoid. Abdomen and Pelvis – Pain, colitis, Crohn’s, appendicitis, tumor, cancer, mass.
Oral contrast comes in two forms: neutral or positive. Neutral oral contrast consists of water or a dilute, low-attenuation solution that mirrors water. Positive oral contrast is an iodinated (ie, gastrografin) or barium-based solution with high attenuation that further demarcates bowel by opacification.
These suggestions are general guidelines that apply to the use of contrast for CT exams provided at Oregon Imaging Centers. If you have questions about ordering your patient’s CT, we encourage you to speak with a radiologist about the study and the need for contrast.
Computed tomography (CT) plays an important role in the diagnosis and treatment of many clinical conditions 1 involving the chest wall, mediastinum, pleura, pulmonary arteries, and lung parenchyma. The need for enhancement with intravenous (IV) contrast depends on the specific clinical indication .
Your provider might use a contrast material to highlight certain areas of your body on the scan. For a CT scan with contrast, your provider will place an IV (intravenous line) and inject a contrast (or dye) into your vein.