Researchers
in India have developed a total cholesterol test that uses a digital
camera to take a snapshot of the back of the patient’s hand rather than a
blood sample. The image obtained is cropped and compared with images in
a database for known cholesterol levels.
Writing in the International Journal of Medical Engineering and Informatics,
N.R. Shanker of the Sree Sastha Institute of Engineering and Technology
and colleagues describe how they have developed a non-invasive way to
test cholesterol levels in patients at increased risk of heart disease.
Their approach is based on the creation of a large database of
cholesterol levels recorded using standard blood tests and linked to a
standardized photograph of the hand for each patient; cholesterol is
concentrated in the creases of one’s fingers. They developed an
image-processing computer program that compares the image from a new
patient with the thousands of entries in the database and matches it to a
specific cholesterol reading.
Measuring
the amount and type of cholesterol circulating in the blood is an
important risk factor in cardiovascular disease. Excess cholesterol not
used by the body in making hormones and building cells is laid down on
the inner wall of arteries as a waxy plaque, which can reduce the normal
flow of blood potentially causing heart problems and increasing the
risk of cerebral stroke. Total cholesterol is a useful early indicator,
although more detailed testing that distinguishes between the HDL
high-density lipoprotein) and LDL (low-density lipoprotein) and
triglycerides are needed for a more accurate health assessment of
patients found to have high total cholesterol. It is LDL, so-called
“bad” cholesterol that contributes to the formation of arterial plaques,
atherosclerosis. The presence of different total levels of cholesterol
can be revealed through image analysis of the skin.
A
non-invasive and inexpensive method for cholesterol screening would
allow this risk factor be determined in much larger patient populations
without the need for costly and inconvenient blood tests. The team will
also soon publish details of the extension of this work to classifying
cholesterol type using their approach.
Non-invasive method of detection of cholesterol using image processing
Source: Inderscience Publishers
