A CT scan is referred to as a computerised tomography scan. It is a diganostic imaging test that uses X-rays to create detailed cross-sectional images of the inside of the body. It is a fast, painless, and non-invasive way to get a multidimensional view of the body’s interior. It is a useful modality that helps in evaluating a range of medical conditions, from trauma to chronic disorders, and provides doctors with relevant information in treating the condition.

What happens during a CT scan?

A CT scan is done in a diagnostic facility or a hospital. It can only be performed by an experienced radiologist or a qualified technician. Before taking this test, the patient is advised to abstain from drinking or eating for several hours before the procedure.

A patient undergoing this scan needs to lie on a table that slides into the centre of the donut-shaped machine. Once the patient is inside the gantry, the machine’s X-ray beam rotates around the patient and generates a series of cross-sectional images. These images are processed by a computer to create a 3D reconstruction of the scanned area. The rotating beam takes the images from many different angles which provides much greater detail than a standard X-ray scan. These image slices, when stacked together, assist in creating a 3D image of skeleton, organs, and tissues. This 3D model assists in finding the exact place of the disorder.

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When is a CT scan suggested?

A CT scan is helpful in identifying a disease or injury within the various regions of the body. It is often used as a screening tool to evaluate possible tumours or lesions within the abdomen. For instance, CT scan of brain is suggested to find out injuries, hemorrhage, tumours, clots leading to stroke, and other conditions.

How long does a CT scan take?

A CT scan is usually completed within 30 minutes but sometimes it may take longer if a contrast agent is given. The duration of the scan also depends on which part of the body is being scanned. In some cases, a blood test before administering a contrast agent is done to ensure that there are no side effects.

Signs you need a CT Scan

This scan may be recommended to know certain health conditions or have further investigation. Here are some signs which suggest the need for this scan. These include:

  • Pre-surgical planning
  • Persistent fever
  • Head injury
  • Abdominal pain
  • Chronic diseases
  • Internal bleeding
  • Trauma
  • Severe injury
  • Severe headache
  • Reoccurring symptoms
  • Chronic symptoms

What is a CT contrast agent?

While bones inside the body are easy to image as they are dense structures, soft tissues are difficult to see. A contrast agent is used to create better images of soft tissues. For this, an intravenous (IV) contrast agent based on iodine may be injected into the bloodstream. This helps looking at possible obstructions in blood vessels. Similarly, to take clear images of esophagus, stomach, and gastrointestinal (GI) tract, oral contrast agents are used.

Disclaimer: For personalised advice and further information, always consult your doctor or qualified healthcare professional.