CT scan, also known as computed tomography is an imaging technique used to carry out examination of internal organs of the body. It provides cross sectional view of the organ so clear that one can actually feel the exact shape and structure of that part.
CT scan uses computer generated radiations. Modern CT scanners use helical or spiral scanning process which generate very clear picture using rotating x rays. Normal x – ray technique cannot generate this type of images.
Cost of CT scan is higher because of the time it takes in scanning and also because it can be carried out only by well trained technician. Machine and maintenance costs are also very high.
Prices for the ct scan imaging of same part of body may differ highly from one lab to other and also based on what kind of scan one needs, plain or contrast, 1.5 T or 3T.
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Technical Difference Between CT Scan and Ultrasound
CT Scan uses rotating x-rays and the radiations emitted by the CT scanner are of the magnitude of 2 to 10 msv. Which is equal to what an average person receives in 3 – 5 years from background radiations.
Whereas ultrasound used sound waves and there are no radiations involved in this. Ultrasounds are safe for pregnant women but CT scan is not recommended until and unless absolutely necessary.
CT scans are much higher in cost than ultrasound. Cost of different ct scans may vary largely but in case of ultrasound difference is not too high.
Time Taken –
CT scans take 60 secs for scan and hence body movement does not effect scan. Scan time for ct scan is generally 30 se however. Whereas ultrasound takes 10 – 15 mins for scanning.
Body Parts that they can scan
CT scanner can scan bony structures in the body while ultrasounds are used for internal organs.
Advantages and Disadvantages
CT scan produces higher contrast images. Single scan can give very clear picture of the bidy part that doctor wants to observe. Hence in most of the cases no further scan is needed.
CT scans can cause cancer specially lung and colon cancer
Ultrasounds are safe in comparison to CT scan. No such negative effect of ultrasound have been seen yet on humans.
With the advancement in technology, modern medicine has advanced beyond x-rays. The most widely used tests besides x-rays are Computed Tomography (CT) scan and Magnetic Resonance Imaging (MRI). But it is quite natural to get confused between two because in both the cross-sectional pictures of the body is shown but the procedure and technique to carry this out is where the difference lies. In both of them the patient is made to rest on a table that slides through the middle of the machine to obtain images of a particular body part. Read on to know the tale of two scans
Computed Tomography (CT) Scan
CT scan uses rotating x-rays to obtain images of the desired body part. In this type of scan the x-ray tube spin around the person placed on the table and the x-ray detector is placed on the exact opposite side of the patient.
A CT Scan can provide complete information about the body, including the chest (lungs and heart), head (inner ear, eyes, brain and its vessels), skeletal system (spine, shoulders and neck), bladder, pelvis and hips, gastrointestinal tract, reproductive system. This scan is commonly used in emergencies as this scan does not take much time and the whole procedure generally takes fewer than 5 minutes.
Unlike CT scan in which x-rays is used, MRI Scan uses radio frequency pulses and powerful magnetic fields. This scan produces detailed and complete images of body parts and organs. MRI Scan is best suited for producing detailed pictures of tendon tissues and examining soft tissues in ligament, brain tumor etc. The cost of MRI scan is generally more than that of CT scan.
A Computed tomography (CT) Scan can provide complete information about the body, including the chest (lungs and heart), head (inner ear, eyes, brain and its vessels), skeletal system (spine, shoulders and neck), bladder, pelvis and hips, gastrointestinal tract, reproductive system. This scan is commonly used in emergencies as this scan does not take much time and the whole procedure generally takes fewer than 5 minutes.
Purpose CT scan
A CT scan is typically used to detect one of the following:
Blood clot within the brain
Degree of soft tissue damage
Diagnose bone and muscle disorder
Preparation for CT scan
You need to fast for nearly two to four hours prior this scan. Your doctor could ask you to stop certain medication before the scan. You cannot wear your jewellery during this scan as metals hinder with the MRI machine’s ability to produce images. Therefore you need to remove all your jewelry prior undergoing this scan.
Procedure of CT scan
A CT scan is performed in a hospital’s radiology department. Once you met all the criteria needed to carry out this scan, you will be asked to lie down on the procedure table and after that the whole process starts. The X-ray tubes and detectors rotate around you and produce various detailed images of your body.
CT scan is a non invasive special x ray equipment to help scan various diseaCt ses and conditions in a patients body.
CT scan is also known as computed tomography and can diagnose severe diseases with accuracy. CT scans are painless and fast.
CT scanner was first installed and used in 1971. CT scan can visualize small nodules and tumors that an x ray cannot.
CT scans can take clear pictures of slices of body parts and hence can create visual images of areas of interest for doctors. It is a very useful technique for the dctors as well as patients to diagnose diseases that otherwise cannot be diagnosed using normal x ray techniques.
Ct scans are frequently used for evaluation of brain, neck, spine, chest, pelvis and sinuses.