Computed Tomography (CT) is an advanced method of X-Ray that is capable of scanning the entire body by producing hundreds of cross sectional images and reformatted with remarkable details. It is usually recommended for patients who are heavy smokers and those displaying signs of infection, inflammation or cancer. Patients with abdominal pain, traumatic pain or who have suffered a stroke are usually advised to undergo a CT scan. It is also suitable for patients with suspected coronary artery diseases or cardiac function abnormalities. Modern CT systems employ dual energy scanning techniques that produce better angiographic images with lower volume of contrast medium. The spectral imaging available through these modern systems are able to differentiate components of lesions such as gout, kidney stones, thyroid nodules, and which helps in choosing the right treatment plan. CT colonography minimises the need for traditional colonoscopy, a process that requires the invasive insertion of endoscopes. The CT Scan radiation dose to patients can be largely reduced by employing advanced technologies.
You are advised to communicate with your doctor about your history with allergies. You should tell the doctor about your medications, food allergies and any history of asthma, urticarial, eczema or allergic rhinitis prior to a CT scan.
You will be asked to lie down and hold your breath. The entire procedure will take about 10 to 15 minutes. In more complicated tests, you may be asked to drink an oral contrast one to two hours before the scan.