Any of these conditions may increase the risk of an adverse effect. A single scan takes approximately one to two minutes, but multiple scans may be required. A radiologic technologist will capture high-resolution CT images while the contrast material flows through the blood vessels. Modern x-ray systems have very controlled x-ray beams and dose control methods to minimize stray (scatter) radiation. When you enter the CT scanner, you may see special light lines projected onto your body. CTA is typically performed in a radiology department or an outpatient imaging center. This ensures that those parts of a patient's body not being imaged receive minimal radiation exposure. Results: The sensitivity of CT angiography in the diagnosis or exclusion of PE in the central pulmonary arteries (to the level of the segmental pulmonary arteries) ranged from 0.74 to 0.81 on the basis of specificities of 0.89-0.91. To avoid unnecessary delays, contact your doctor before the exact time of your exam. Sometimes a follow-up exam is done because a potential abnormality needs further evaluation with additional views or a special imaging technique. Objectives . The computed tomography pulmonary angiogram (CTPA/CTPE) is a commonly performed diagnostic examination to exclude pulmonary emboli. Occasionally, sedation is required for children to keep them still during scanning. University of Virginia Health Sciences Center Classification of a pulmonary embolism may be based upon: 1. the presence or absence of hemodynamic compromise 2. temporal pattern of occurrence 3. the presence or absence of symptoms 4. the vessel which is occluded Also, an extended close observation following the scan may be required until the medication used for sedation wears off. You may feel warm or flushed while the contrast is injected. Also inform your doctor of any recent illnesses or other medical conditions and whether you have a history of heart disease, asthma, diabetes, kidney disease or thyroid problems. There is always a slight chance of cancer from excessive exposure to radiation. Angiography is an imaging test that uses x-rays and a special dye to see inside the arteries. It is not advised to administer iodinated contrast material in patients with impaired renal function or who previously exhibited a severe allergic reaction to contrast material. Women should always inform their physician and the CT technologist if there is any possibility that they may be pregnant. A person who is very large may not fit into the opening of a conventional CT scanner or may be over the weight limit—usually 450 pounds—for the moving table. How is a CTPA performed? Computed Tomography Pulmonary Angiography Spiral computed tomography pulmonary angiography (CTPA) is the most frequently used imaging modality for detecting PE in modern clinical practice. CT angiography is helpful in examining blood vessels and the organs supplied by them in various body parts, including: Physicians use CT angiography to diagnose and evaluate many diseases of blood vessels and related conditions such as: Also, physicians use CT angiography to check blood vessels following surgery, such as: You should wear comfortable, loose-fitting clothing to your exam. Anxiety & Depression: How Your Mental Health Professional Can Help, Common myths people may have around making a Will, Social robots set for role in mental health treatment, How to Cope and Recover from a Sports Injury. Radiologists will analyze these images using sophisticated computer programs and high-quality monitors to detect diseases in the body. CT and angiography have complementary roles in the accurate diagnosis of acute and chronic thromboembolic disease. A CTPA is interpreted by an experienced radiologist. You may need to wear a gown during the procedure. However, the technologist will always be able to see, hear and speak with you through a built-in intercom system. If you have a history of allergy to x-ray contrast material, your doctor may advise you to take special precautionary medication, such as a steroid, for a few hours or the day before CT angiography to lessen the chances of an allergic reaction. CTA is typically performed in a radiology department or … During scanning, the table is positioned at the start point of imaging and will then move through the opening of the machine as the actual CT scanning is performed. Computed tomography angiography (CTA) uses an injection of contrast material into your blood vessels and CT scanning to help diagnose and evaluate blood vessel disease or related conditions, such as aneurysms or blockages. There are special circumstances procedures such as chemoembolization or selective internal radiation therapy from excessive exposure to than! 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