CT Scan Function and Working Principle

CT stands for computed tomography.

Tomo- Means section
Graphy-means presentation
It’s a diagnostic device. It takes an image by applying an X-ray beam to the patient.
The way it works is by creating an x-ray beam by two detectors .gas filed detectors or
scintillation detectors.

CT scan function and working principle
CT scan function and working principle


CT is a neuroradiological investigation. It gives you a picture of your body. it shows a picture of soft tissue and the structure of the body. It can be used for many types of tests such as: It is used to test the chest, pelvis, and abdomen with an accurate image of all types of tissue.

Used to check the pain and breathing difficulties. Test some injuries like trauma Skeletal structure problems such as spinal treatment, hands and feet injuries. As it can show the small bones and the surrounding tissues.

Used also to detect any type of cancer such as lymphoma, and body parts cancers. It provides the presence of cancer, size, defined the precise place, and if there is any involvement with other body parts.

Working Principle of CT Scan

It relies on target density variation that affect affects the attenuation of high-frequency waves. CT intern works onto the basic principle of X-rays which Photo-Electric Effect.

the picture of the patient is viewed thru X-ray imaging from varied angles & are then the detailed structures are mathematically reconstructed & the formed image is displayed on a video monitor.

CT Scan Vs MRI

C T works with Ionizing Radiation Effect Where M R I works with the Non-Ionizing Radiation effect. IN C T we Can View Bone Soft Tissue and a Few Nerves.

Whereas MRI we can View Bone Soft tissue and Nerves Clearly. MRI and CT both are methods of Imaging Organs of the Body, Basic Difference between both of them is that MRI will give you a clear view of the Soft Tissue of the Body organs, And CT is more preferably good for the Bone and Hard tissue.

Besides Basic Principle of Working is also different as MRI is dealing with Electromagnetic Field and CTs works on X-rays.

What I encounter is that Brain CT will not give you the clarity of All the Soft tissue of the brain in detail, Although Adjusting the image does help identify those to some extent. I don’t know, Maybe Grayscale Images of Body organs in DICOM Format.

CT scan function and working principle
CT scan function and working principle

CT & MRI both are very vital scans for Neurosurgeries relating to the Brain and Spine. Resolution & Details matter a lot, particularly in this Domain, Particularly if a surgeon has to make use of the Navigation System, He or She would need a scan with the Standard Protocols of the Navigation System.

CT and MRI are both radiographic machines but the MRI is more complicated than CT and it uses magnetic fields. The soft tissue details can be evaluated better in MRI than CT scanners.

In pregnancy, other devices that do not include radiation such as MRI and ultrasound are preferred. The images provided by the CT Scanner had a three-dimensional reconstruction.

CT scans are used to help diagnose tumors, check for internal bleeding, or check for other internal injuries or damage. CT may also be used for tissue or fluid biopsy. The CT scan test is generally painless, quick and easy. Multidetector CT reduces the time taken for the patient to lie down.

Usually, an hour’s planning is required for a CT scan. Most of the time is spent in preparation. The scan takes 10 to 30 minutes or less. Usually, you can resume your activities when a healthcare provider says it is safe to do so.

Ct scan have five generation antel now
It deference by the number of slice on detector.

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