Frequently Asked Questions
Below are some frequently asked questions. If you require more information, do not hesitate to contact us with your query.
Bones due to high calcium content are visualized well on x-rays, but soft tissues of the body can be difficult to see. Contrast agents are therefore used to enhance specific organs or blood vessels, making them more visible on a diagnostic image. Some contrast agents are designed for the patient to drink, while others are injected, delivered through an intravenous hook-up, or administered rectally through an enema tube. The most common types of contrast used in general radiography are air, iodine and barium. Air encourages the passage of x-rays through a selected part of the body, while barium and iodine block the passage of x-rays. In MRI, a special contrast is used to delineate and characterize lesions.
Because the use of contrast agents carries a small risk of allergic reaction, you should let your physician or the radiographer know if you have allergies of any type.