• +011-47252025


Contact Info

  •   +011-47252025, 47252075 (centralised)

  •   info@cityimaging.in

  • Tilak Nagar 

    4b/18 Near Haldiram Sweets, Tilak Nagar, Opposite to Metro Pillar Number 492, New Delhi - 110018

  • Janakpuri 

    90, Block C3, Janakpuri, New Delhi - 110058

  • Pashchim Vihar 

    A2/7 Ground floor, Prateek Apartment, Paschim Vihar, New Delhi-110063

  • Najafgarh 

    Near, Property No 13,14,15 Raghubir Enclave Chhotu Ram Market, Nangloi - Najafgarh Rd, Najafgarh, Lokesh Park, Delhi, 110043

  • Palam 

    RZ-1B Puran Nagar, Raj Nagar, New Delhi -110045


  • Slice count refers to the number of rows of detectors in the z-axis of a CT.
  • You might see a particular CT referred to as an "8-slice CT scanner," "16-slice CT scanner," etc.
  • In an 8-slice CT, there are eight slices of data captured for every rotation of the gantry
  • Slice Increment refers to the movement of the table/scanner for scanning the next slice.
  • City Imaging and Clinical Lab is equipped with Siemens SOMATOM Sensation CT Scanner, which is an excellent time tested and tried top-of-the line ultrafast 194 slice CT scanner.
  • It is an extremely fast multidetector scanner with tube rotation of 330 ms and high temporal resolution of 165 ms, optimum for CT Coronary Angiography.
  • It has high-resolution image capability, with the ability to create brilliant 2D and 3D images.

CT means 'Computed Tomography'. CT Scanners have revolutionary evolved from the conventional slice-to-slice scan to spiral/ helical scan and then to multidetector/multislice scan,which are capable of acquiring multiple sections per second significantly reducing scanning time and improving patient compliance.

They use X-ray tube and multiple rows of detectors which rotate around the patient providing diagnostic images through body volume, with isotropic multiplanar imaging. The scanner gives high-resolution images of any part of the body, but is especially excellent for cardiovascular, lung and abdominal imaging.

CT can be used in patients who cannot undergo MRI e.g. patients with pacemakers, cochlear implants and aneurysm clips. It can also be used in the presence of an implant, where MRI can leave significantly degrading artefacts, precluding proper visualization of the part.
Radiation hazards warrant judicious use of CT in pediatric and pregnant patients, but can be minimized with patient and body-specific protocols and dose reductions.

Computed Tomography Scan – CT Scan FAQ’s

What is a CT scan?

What is contrast media?

This substance is given to highlight various body parts of your body. It is usually given by mouth and/or Intravenous injection. It is normal to feel a warm sensation as the dye makes its way through your system.

Why do I need to drink contrast?

The oral contrast fills the colon and small bowel for better visualization on the images. Patients usually need to drink at least 1 liter or 1000cc to sufficiently fill the stomach and intestines with oral contrast. There are different types of substances used for oral CT contrast. They could be, barium sulfate, Gastrografin, and Omnipaque 300, mixed with 1000cc of water or water alone.

Why do I need the IV contrast?

The IV contrast (iodine or contrast “dye”) enhances all of the vascular structures on the images, this helps your Doctor see the organs, blood vessels and bones inside your body . The multiple images provided give your doctor many different views of your body. It will also help them see any potential pathology or abnormality.

Could I have a reaction to the IV contrast?

Yes, but the chances are minimal. It has the same risk for reaction as any medication does, which is why we use contrast screening forms to check for possible patients who are at risk of having reaction to the contrast. Although rare, the contrast medium involved in CT scan poses a slight risk of allergic reaction. Most reactions are mild and results in hives itching and rashes. In some rare instances, an allergic reaction can be serious and potentially life-threatening, including swelling in your throat, mouth or shortness of breath. If you experience this, tell your technologist immediately.

Will the CT imaging Examination Hurt?

No, CT imaging itself should cause no pain. CT imaging requires that the patient remain still during the examination. For some patients, keeping still for some time may be uncomfortable. The CT examination itself causes no bodily sensation.
CT imaging examinations that require the patient to receive iodine contrast injection may cause slight, temporary discomfort while the intravenous needle is placed.

Is CT Imaging Safe?

Yes, CT imaging is considered a safe examination. In general, the diagnostic benefit of a CT scan usually outweighs the risk of x-ray radiation exposure or injections of imaging contrast and use of sedatives during the scan. Patients should inform the radiologist or technologist if they have a history of allergies (especially to medications, previous iodine injections, or shellfish), diabetes, asthma, a heart condition, kidney problems, or thyroid conditions.

How Long Will the CT Examination Take?

Depending on the type of exam you will receive, the length of the actual procedure will typically be between 10 minutes and 45 minutes. A few involved CT examinations take longer than 45 minutes at City Imaging and Clinical Labs.
Also, many CT exams require the patient to hold their breath several times. This helps to eliminate blurring from the images, which can be caused by breathing or other patient motion. Please discuss specific questions about the duration of your CT imaging examination with the technologist before your exam.

Do I need a Referral (Prescription) to Receive an CT Examination?

Yes, your doctor must give you a referral (prescription) in order for you to receive a computed tomography (CT) imaging examination. However, CT can often be performed on an outpatient basis without having to admit the patient to the hospital.

Can I Move While I am in the CT Scanner?

You should not move when you are on the CT table and the images are being acquired. It is important that you not move the body part being imaged, for example your head, until the entire CT exam is complete. CT exams of the chest and abdomen require the patient to hold their breath for a short period of time, for example, 10 to 25 seconds. This eliminates blurring in the image caused by breathing or other patient motion.

Can I Talk With Anyone During the CT Scan?

You may talk to the technologists or ask a question in between CT data acquisitions.

Can I Bring a Friend or a Relative into the CT Scan Room With Me?

No, CT uses x-ray and only the person being imaged should be in the CT scanner room during the examination.

Do I Need an Injection of Contrast for my CT Exam?

Not everyone needs an injection for CT imaging. When an contrast injection is needed, a pharmaceutical contrast agent made of iodine is used. This is only done when the radiologist and/or the referring physician have determined that it is necessary for diagnostic purposes. Iodine contrast is used to make specific organs, blood vessels or tissue types "stand out" with more image contrast in the resulting picture. This highlights the structure of the specific organs or vessel to better show the presence of disease or injury. The referring doctor provides the CT center with information about the patient's medical condition and the goal of the CT imaging procedure being ordered (for example, to diagnose cause of intense back pain). The decision to use or not to use an injection of CT contrast is made based on this information and the body part being examined.

If I'm Nursing an Infant, Can I Breast Feed After an Injection of CT Contrast?

Typically, patients are instructed to wait for 24 hours after receiving the CT contrast injection before breast feeding again. Patients may wish to pump breast milk prior to the CT exam and store it for use during this 24-hour period. Always check with the radiologist and the imaging center for their specific recommendations.

Can I Have an CT Imaging Exam if I am Pregnant?

Pregnant woman should not have a CT exam or any x-ray examination, especially if the woman is in her first trimester (first of three-3 month periods of pregnancy). Depending on the condition, there may be other exams available, such as ultrasound, to help diagnose a medical condition. Pregnant women should always inform their imaging technologist or radiologist that they are pregnant, or may be pregnant.