Human skin temperature can be imaged by thermal or infra-red cameras. When there is a blood flow under the skin, then that area will be warmer. In the thermal image it will be shown in red colour. If there is no blood flow it will result in a cool place. In the thermal image it will be shown in blue colour.
A innovative company PhotoMed, goes beyond this research limitation. They use entire visible spectrum for treating people with ailments. They change the wavelength during the therapy.
Thermal imaging is used by PhotoMed, for objective feedback.
for more information :
PhotoMed Technologies, Inc.
California, USA.
www.photomedtech.com