CT Scan is used | What is a CT Scan | How does CT Scan work

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CT Scan is, How does CT Scan work, What is a CT Scan


What is a CT Scan 

CT scan (computed tomography scan) is a non-invasive imaging test. In this, images of the inside of the chest are prepared with the help of X-rays and computers. (CT Scan is) Compared to X-ray, CT scan tests produce more clear and detailed images of soft tissue and internal organs (especially blood cells). 

During a chest CT scan procedure, the X-ray beam travels around your body to produce multiple images of the inside of the chest. These images can be easily viewed on the monitor and any abnormalities can be detected. In some cases, a contrast dye may be used during the test to make the images appear clearer. This dye is injected into the body through injection. 

CT scans, which have been used in the medical field since the early 1970s, have improved the medical field by displaying stereoscopic images of organs such as the head, heart, and lungs. The images generated by the CT scanner can be clearly recognized by the skeletons, tissues, blood vessels and other parts of the body. 


CT Scan is used in this physiological condition 

  • Infection or inflammation
  • Difficulty in breathing, cough and fever
  • Chest pain for which the cause is unknown
  • Tumors and other lesions
  • Internal bruising or bleeding inside the chest
  • Blockage in the chest
  • Diagnosing and evaluating lung disease from pneumonia
  • Planning for radiation treatment or assessing treatment response 



How does CT Scan work  

CT scanners combine state-of-the-art hardware and software technologies to create 3D images of human organs. 

The scanner consists of an X-ray tube and a detector that, facing oppositely, rotates around the patient for a full 360° axis scan. The X-rays emitted through the tube pass through the body. The array of detectors reversibly captures attenuated X-ray photons and collects vast amounts of data from multiple angles as the patient travels through the scanner. 

CT Scan is,How does CT Scan work,What is a CT Scan

X-ray Tube and Detector Table 

Both the X-ray tube and the detector array are mounted on a rotating ring (gantry). The gantry controls the speed of rotation and accurately measures the position of the angle at which the projection is made. 

The array of detectors moves around the patient and captures projected images from multiple angles. These projections are used to generate stereoscopic slice images of the body. The cropped image is overlaid through a complex algorithm to create a rendered 3D image. 

That’s why it is called “computed tomography”. Tomography shows how an image is obtained by “cutting” the body vertically. This technology is also called a “computer” because it is compiled into software to render hundreds of cropped images into images that doctors can view and analyze. 

The image provided clearly shows the difference between different body parts without overlaying, which can be very useful information. The apparent difference is due to the different attenuation characteristics of X-rays based on soft body tissue, skeleton and blood, (How does CT Scan work) and the presence or absence of contrast medium at the time of scanning. In addition, CT scanner software can display 3D rendered images or slices to eliminate material overlays by capturing projection results from different angles. 



Difference between a CT and a MRI 

The CT scanner sends an X-ray beam through the body as it rotates through an arc, taking multiple pictures. The CT scan looks at different levels of density and tissue inside solid organs, and body systems including the head (brain, eyes, inner ear, and sinuses), chest (heart and lungs), skeleton (neck, shoulders, and spine), pelvis and provides detailed information about the hips, reproductive system, bladder and gastrointestinal tract. 

Unlike CT scans, which use X-rays, MRI scans use powerful magnetic fields and radio frequency to take detailed pictures of organs, soft tissues, (What is a CT Scan) bone and other internal anatomical structures. The difference between normal and abnormal tissue is often more apparent on an MRI scan than on a CT scan. And no radiation is used in an MRI scan, it takes longer than a CT scan with a loud noise.


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