What is a Thermogram?

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  • Written By: N. Madison
  • Edited By: Bronwyn Harris
  • Last Modified Date: 13 August 2019
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A thermogram is a type of imaging test. It involves capturing infrared images of the heat that radiates off a person’s body and using the images to detect signs of medical conditions or injuries. Abnormalities are detected because of changes in heat production that can be noted via these images. For example, if infection or abnormal growths are present, inflammation will result, causing an abnormal image to appear.

This type of test differs from some other imaging tests, such as x-rays, in the fact that it does not use radiation. This means a person can have thermograms as often as necessary without worrying about risking her health. Additionally, there’s no need for medical equipment to touch the body when a thermogram is performed, and the procedure does not cause pain or physical discomfort.

With thermogram images, colors are used to indicate cooler and warmer areas. Some equipment produces black and white pictures, with the hotter areas showing up as white and cooler areas showing up as black. Other equipment depicts images in several colors. With this type of equipment, black, blue and violet indicate cooler areas while red and orange mean the area has more heat. To indicate a middle area of temperature, green and yellow are used.


Often, thermograms are used to capture images of breast tissue and detect changes that may indicate the development of cancer. As cancer develops in a woman’s body, her body forms new blood vessels in the breast. Heat production in the area increases as well. These changes in the breast may develop and show up on a thermogram years before cancer cells develop and a lump starts to form.

Since a thermogram can detect breast changes so early, maybe even years before the invasion of cancer cells, it provides a way to warn patients of very early cancer growth or future risk. This allows doctors to watch patients closely and treat them very early on. Doctors may even take preventative measures to avoid cancer growth or stop it from spreading.

Sometimes thermograms are used along with mammograms. A mammogram is a low-dose x-ray that is performed on the breast. Together, these imaging procedures may provide early and more accurate detection of breast cancer growth. However, they are used in two different ways. A thermogram can be used to note heat changes in the breast, which indicates possible abnormalities. Mammograms, on the other hand, are used to detect a mass that’s developed after the cancerous cells have been in the body for quite some time.

In addition to medical uses — such as detecting cancer, soft tissue injuries and diseases that affect the blood vessels — there are many applications for thermogram technology in research and science fields. For example, an energy auditor may use it to assess insulation in buildings. Thermogram equipment may even be used to help scientists probe for life on other planets and learn about conditions there.


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Post 2

I think thermographic imaging is an exciting medical advancement that helps doctors diagnose many internal issues and limit radiation exposure. Hopefully this field will continue to advance and thermogram technology will eventually be available in all areas of the country.

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