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CT Scan

Services / Radiology / CT Scan



CT Scan

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.

Computed tomography (CT) of the body uses sophisticated x-ray technology to help detect a variety of diseases and conditions. CT scanning is fast, painless, noninvasive and accurate. In emergency cases, it can reveal internal injuries and bleeding quickly enough to help save lives.

Computed tomography, more commonly known as a CT or CAT scan, is a diagnostic medical imaging test. Like traditional x-rays, it produces multiple images or pictures of the inside of the body.

The cross-sectional images generated during a CT scan can be reformatted in multiple planes. They can even generate three-dimensional images. These images can be viewed on a computer monitor, printed on film or by a 3D printer, or transferred to a CD or DVD.

CT images of internal organs, bones, soft tissue and blood vessels provide greater detail than traditional x-rays, particularly of soft tissues and blood vessels.

Using specialized equipment and expertise to create and interpret CT scans of the body, radiologists can more easily diagnose problems such as cancer, cardiovascular disease, infectious disease, appendicitis, trauma and musculoskeletal disorders.

A radiology technologist will perform the CT scan. During the test, you’ll lie on a table inside a large, doughnut-shaped CT machine. As the table slowly moves through the scanner, the X-rays rotate around your body. It’s normal to hear a whirring or buzzing noise.

Movement can blur the image, so you’ll be asked to stay very still. You may need to hold your breath at times while the process of CT Scan.

Radiologists and radiation oncologists often use the CT Scan examination to:

  • Quickly identify injuries to the lungs, heart and vessels, liver, spleen, kidneys, bowel or other internal organs in cases of trauma.
  • Guide biopsies and other procedures such as abscess drainages and minimally invasive tumor treatments.
  • Plan for and assess the results of surgery, such as organ transplants or gastric bypass.
  • Stage, plan and properly administer radiation treatments for tumors as well as monitor response to chemotherapy.
  • Measure bone mineral density for the detection of osteoporosis.

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


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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
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In Detection of

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