YOLA 09A: The CT Scanner - p3

injected
In many cases, a patient must be given a contrast material before undergoing a CT scan. During "dynamic CT scanning," iodine dye is either injected into the blood or added to a drink that the patient must ingest.

contrast
The X ray dye makes it easier to see the organs and blood vessels when the pictures are developed. The intravenous contrast material is used for chest or pelvic scans, while oral-contrast material is used for abdominal scans.

sensation
In some cases, physicians request that pictures be taken both before and after the contrast material enters the patient's body. Patients who receive contrast material in the arm often report feeling a warm sensation.

allergic reaction
In rare cases, patients who receive the contrast material have an allergic reaction. Contrast material also causes water loss and is avoided when scanning patients who suffer from kidney failure.

minimal
The danger of radiation exposure caused by X-ray beams is generally considered minimal compared to the benefits that a CT scan can provide.

internal
In many cases, especially in the detection of tumours and internal bleeding, CT scans provide information that can save a person's life.

controversial
Full-body scanning, which is saved for serious conditions such as coronary artery disease, remains a controversial procedure.

exposure
Prolonged exposure to radiation is linked to cancer. Pregnant women are excluded from receiving CT scans, as the X rays can be harmful to the fetus.

procedures
When pregnant woman require an evaluation, most physicians favour using other procedures such as an ultrasound or an MRI.