Computed Tomography (CT) also known as “CAT scanning” (Computerized Axial Tomography), it uses X Rays to obtain detailed pictures of your body in cross-sections ‘slice sections’. The scanner is an open small ring structure and not a tunnel as everbody expects !
In our scenario, CT technology has today become an indispensable and integral component of routine work in clinical and medical practice, specifically in radio-diagnosis and procedures such as GI imaging, cancer detection and staging, pre surgery planning in head and neck, lung analysis, angiographic studies and radiotherapy planning. CT images show the internal organs, bone, soft tissue, and blood vessels in better detail.
We at SDC have 32 Slices CT Go-Now (Introduced in 2017 worldwide) by Siemens which is a 1st Prestigious Installationin Uttarakhand having (32 slices/sec reconstruction)
Its salient features include:
*Excellent spatial & temporal resolution.
*Reduced scan time.
*Isotropic imaging possible.
*Better multiplanar reconstructions.
*Excellent Contrast Angiography.
*Slices as thin as 0.625 mm possible.
*3D reconstruction of inner joint.
*Multiphase CT for Liver, Pancreas & Kidneys.
CT Imaging Examinations General Instructions :
You should have NOTHING to eat for 4 hours prior to a CT examination. You may only have clear liquids (water, apple juice). Patients should take their medications at the normal time with clear liquids only. Patients on Metformin should not take Metformin the morning of the imaging study. Some patients may need to drink oral contrast. If you were given oral contrast by us prior, then you should should drink the bottle 2 hours prior to your appointment. If you did not receive the contrast prior, then you must arrive at the centre 2 hours prior to your examination time.
Wear comfortable clothing free of zippers, metallic buttons as well as jewellery that could interfere with your scan. Elastic bands are acceptable.
Female patients must notify if they are or think they might be pregnant, for further instructions.
A blood test (Creatinine) is required within 6 weeks of CT examinations ordered with IV Contrast.
You can take all your prescribed medicines as usual (for diabetic patients please see below)
What is IV contrast media and what does it feel like ? :
Its an iodine based compound and in order to see the blood vessels and body tissues on the scan, it is intravenously(IV)injected into the vein. It is removed from the body through the kidneys, but will not change the color of your urine.
During the injection of the contrast generally a metallic taste in the mouth and a warm sensation throughout the body is there for about a minute or so. If you feel any discomfort in your arm please tell us so.
Contrast Administration in Patients Receiving Metformin
If you are a diabetic patient taking any medication that contains Metformin and are scheduled for an examination that requires IV contrast DO NOT take your medications on the day of your appointment and for 48 hours following completion of your imaging examination and reinstituted only after renal function has been re-evaluated and found to be normal.
CT Examination of Head/Neck/Chest – with Contrast only (No special prep necessary without contrast) Nothing to eat or drink for 4 hours prior to the examination. If the patient has allergies to contrast, then the patient or relatives should inform the team beforehand. For diabetic patients having a CT examination with IV contrast, please see the instructions above. Take all non-diabetic medications as directed. CT Examination of Pelvis – With or Without Contrast Nothing to eat or drink for 4 hours prior to the examination. Drink first bottle of contrast 2 hours prior to the examination; drink the second bottle of contrast 60 minutes prior to the examination. If the patient has allergies to contrast, then the patient or relatives should inform the team beforehand. For diabetic patients having a CT examination with IV contrast, please see the instructions above. CT Examination Without Contrast No preparation is required.
What to expect during the scan ?
Firstly you should bring a person along to accompany you before and after the scan. Please notify the doctor if you have any allergy to iodine or intravenous contrast, if so you need to be pre-medicated. The study is not painful. An IV cannula will placed. You will be positioned on the table and will go inside the centre of the scanner for a few minutes. Some exam require you to move through the scanner more than once, some are shorter and some are longer.
A single phase exam may be performed with hand injection or via a 22G iv.
Multiphase exams and CT angiography can only be performed with pressure injector (Medrad) and a 20G iv or larger is required.
Q. What are the dangers of CT scanning?
Though it involves X-Ray radiations, there are no dangers in practice. The amount of radiation is kept to a minimum by automatic exposure control on the scanner (sophisticated hardware). Medical xrays give an additional dose and the level of dose varies with each examination. Increased risk from medical xrays is outweighed by the benefit of having the scan performed so that diagnosis can be made and any necessary treatment planned.
Q. What is a ‘contrast’ medium?
A contrast is an iodinated compound injected intravenously (peripherally) to opacify the blood vessels and enhance the ability of CT scans to pick up abnormalities Only the very safest contrast (non-ionic) is used for all the patients in our centre.
Q. Dangers of contrast medium?
Though not so common, the contrast medium involved in a CT scan poses a slight risk of allergic reaction.
Most reactions result in hives or itchiness.
For individuals with asthma who become allergic to the contrast medium, the reaction can be an asthma attack.
In very rare instances, an allergic reaction might cause swelling in your throat or other areas of your body
If you experience hives, itchiness or swelling in your throat during or after your CT exam, immediately tell your technologist or doctor. We keep an emergency kit for all commonly known adverse reactions.