Lasers light up blood-flow dynamics Feature Summary

Type:
Physics in Your World
Title:
Lasers light up blood-flow dynamics
Description:
If you shine a laser beam at a small angle to a piece of white paper, so the beam spot spreads out, you'll see what is called a speckle pattern (do this experiment with adult supervision). If you shine the beam on your skin, you'll see a different kind of pattern.

The image shows how laser speckle imaging can show the difference between normal blood flow, in the finger on the left, and increased blood flow due to the warming of the skin (the figure on the right was immersed in hot water). To find out more, see Lasers light up blood-flow dynamics.
Image:
Image credit: Michael Smith, Institute for Biodiagnostics, Winnipeg, Canada; <a href="http://optics.org/cws/Articles/ViewArticle.do?channel=technology&articleId=25633" target="_blank">image source</a>; <a href="http://www.compadre.org/informal/images/features/laser-speckle-large.png" target="_blank">larger image</a>
Image credit: Michael Smith, Institute for Biodiagnostics, Winnipeg, Canada; image source; larger image
Image URL:
http://www.compadre.org/Informal/images/features/laser-speckle-large.png
Featured:
January 1, 2010 - January 16, 2010