CT scan vs X-ray

At every clinic appointment, I have go to the lab for x-rays. This past appointment, my doctor expressed the need for a CT scan (aka CAT scan) after viewing my x-rays.

So, what's the difference? 

Chest x-ray: left lateral

X-rays are the most commonly used imaging technique. Your body is positioned between the machine and photographic film. The machine sends electromagnetic waves through your body exposing you internal structure. The level of radiation is not harmful but you should inform the technician if you are or might be pregnant. Bones, tumors, and dense matter will appear as white or light on the image.The process takes only a few minutes.

A CT scan takes a 360 degree picture of internal organs, vertebrae, and the spine. It is more similar to an MRI than an x-ray. You can think of it as a highly sophisticated x-ray. Depending on the reason for the CT scan, a contrast dye might be used to make structures more visible. 

Types of dye include barium- which is used for gastro-intestinal CT views or iodinated which is used intravenously to highlight the vessels and tissue changes.

Chest CT can demonstrate various lung disorders:
-old or new pneumonia, show advancements of pneumonia
-tuberculosis
-COPD/emphysema 
-inflammation or other diseases of the pleura, the covering of the lungs
-diffuse interstitial lung disease

CT machine at BUMC

-lung cancer
-congenital abnormalities.

The machines used for CTs and x-rays also differ. The CT machine looks like a big donut and you lay on a bed that runs you through the center of it. There are receptors and x-ray tubes that spin around you and make a humming sound as they take pictures of your organs. 

Image captured: 

Radiation exposure of CT scans is higher than other forms of imaging.


Please remember, I am NOT a physician, radiologist, or in the medical field. I write based off of my knowledge and experience. 


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