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CT Scan

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Overview

A CT-scan or computed tomography scan produces cross-sectional images or slices of the parts of body using computer processed X-rays. These slices or images are used for therapeutic and diagnostic purposes.

CT-Scan or X-Ray?

A regular X-ray sends images from a stationary machine through the body to make a “shadow” picture. In CT, the X-ray machine rotates around the body and makes pictures that are like “slices” through the body, providing much more information than a regular X-ray.

A CT-Scan is better than the X-Ray because it can reveal structures of all types of tissue and not just bone.

Uses of a CT-Scan


Used In Diagnosis

  • For Abnormalities of body organs-such as that in heart, lung, liver etc.
  • Locating Appendicitis
  • For Gall bladder masses
  • For Kidney stones
  • For Sinus infections, problems
  • Locating Tumours& Spread of Cancers
  • For Vertebral fractures

In Detection of

  • Cysts
  • Skull fractures
  • Injuries in bones
  • Infections
  • Defects in internal organs
  • Density of Bones(as in Osteoporosis)

3D Reconstruction of CT scans of Joints/Face

  • 3D CT Scans can only be done on high-end CT machines
  • It is useful to localize <lesion?> accurately & helps the orthopaedic and ENT <surgeons?> testing their patients

Other uses

  • In identification of disease
  • To guide during Biopsy
  • To find stage of Cancer

About CT-Scan

If you have been asked to get a contrasted image then the radiologist will inject a contrast medium through the intra-venous pathway. Then the lab technician or radiologist will assist you to get ready for the scan after you have answered all the questions been put forward. Once you are in the scan room, you will be laid onto a sliding tray which moves in and out of the CT scanner (which is doughnut shaped in structure). Once you are secured into the required position the scan commences and takes about 10 minutes overall. After the scan you may redress and await your result and go for a consultation too.
  • It is a Painless test.
  • X-rays used are not felt.
  • Test time may be from a few seconds to 1 min on a high-end machine. The newest scanners do full body scan in less than 30 seconds.
  • You have to remain still during the test.
  • You are back to normal almost immediately.
  • If possible, pregnant women should avoid a CT scan, as there is a minimal risk of X-rays causing abnormality to the unborn child.
  • Being exposed to radiation-If you have many CT scans or X-rays over a period of time, you do increase your risk for cancer, though very minimally.
  • The risk from any one scan is negligible.
  • Complications are rare.
  • Some allergic reaction to contrast medium can happen, like nausea, vomiting, irritation but that is treatable immediately.
  • CT Scan of KUB is very useful in localizing stones in the kidneys and ureters, especially when they are not visualized on ultrasound or x-ray of abdomen.
  • CT Urography is done with contrast and it tells about the function of the kidneys
  • Results are better on high-end CT machines and even small stones can be diagnosed
  • The dose of radiation in newer machines is very less.
  • It can provide 3D images for one-time diagnosis.
  • It has a very good contrast so there won’t be chances of repeating the scan to improve accuracy.
  • For calcium Scoring – especially in diabetic patients and in patients with family history of coronary artery disease
  • For Cardiac Angiography – CT Scan is a non-invasive method to detect blockage in coronary arteries.
  • CT Entrography is done for detailed evaluation of bowel <Lesions?> and can be done only on high-end CT machines
  • It is done by giving I/V entry or oral mannitol solution