Computed Tomography or CT Scan is one of the advanced X-ray procedures. Different from the usual X-ray, CT scan employs multiple X-ray beams and creates a detailed, 3D-like image of the body parts. CT scan of chest—also CT scan thorax—focuses on lungs and is designed for identification of various lung-related disorders. Because CT scan chest gives elaborated images of lungs, it detects and predicts the presence of lung cancer at early stages. A CT scan of abdomen provides the details of the blood vessels, bones and organs in the abdominal cavity.

Let your physician know if you have particular allergies, are pregnant, have diabetes or weigh

more than 135 kg because CT scanners have a weight limit.

Your physician may ask you to do the following prior to the scan:

1. fast for 2–4 hours,

2. stop taking particular medicines,

3. drink a large glass of oral contrast (chemicals to get better images) wait for 60–90

minutes,

4. wear a loose clothing that is comfortable and

5. remove items like dentures, jewellery, hair clips, hearing aids, eyeglasses, etc.

Depending on the type of CT scan – chest/upper abdomen, the contrast may be:

1. delivered through a vein in your forearm or hand,

2. given via the rectum using an enema or

3. taken orally in a liquid form.

CT scan is done for the following: Chest: analysing the abnormalities in the chest; detecting lung cancers or tumours and blood clots or internal injuries; monitoring the effect of lung cancer drugs on cancer; etc. Abdomen: detecting pain or a mass in the abdomen; locating kidney stones; diagnosing cancers, appendicitis, or Crohn’s disease; etc.