When non-contrast CT is not enough
Contrast is not needed to diagnose ordinary sinusitis and plan endoscopic surgery: a non-contrast study perfectly shows the contents of the sinuses, the condition of the anastomosis and anatomical features. Contrast is added if a neoplasm of the nasal cavity and sinuses is suspected, with a complicated course of sinusitis with the spread of the process into the orbit or cranial cavity, as well as if fungal infection and invasive forms are suspected. The contrast makes it possible to distinguish actively blood-supplied tumor tissue from the accumulation of secretions and thickened mucosa, as well as to see the boundaries of the spread of the process.
What is the power of computed tomography?
MSCT creates an image using X-rays and produces thin sections with high spatial resolution. It is indispensable where bone, lung tissue, fresh hemorrhage and precise vessel geometry are important, as well as in emergency situations - the examination takes seconds.
Three-dimensional reconstructions are constructed from the resulting sections: this allows the surgeon to see the anatomy in volume in advance and plan the intervention.
When you need contrast
Intravenous contrast dramatically increases the information content in the study of blood vessels, tumors, inflammatory processes and parenchymal organs. It shows the nature of the blood supply to the formation, which often determines its nature.
Before a contrast study, kidney function is assessed by creatinine level and an allergic history is clarified - reactions to iodine-containing drugs are rare, but require attention.
CT or MRI
- CT scan is better: bones, lungs, acute hemorrhage, stones, vessels, emergency conditions
- MRI is better: brain and spinal cord, soft tissues, joints, pelvis, liver
- CT is faster and more accessible, MRI does not provide radiation exposure
About radiation exposure
Computed tomography uses x-rays and is therefore prescribed according to indications. Modern machines use dose reduction protocols, and the information obtained from sound research usually far outweighs the risk. During pregnancy, CT scans are performed only for health reasons.