Optoacoustic imaging

From WikiMD
Jump to navigation Jump to search

Optoacoustic imaging (Photoacoustic Imaging) is an imaging technology based on the photoacoustic effect, and can be used for obtaining images of structures in turbid environments. The optoacoustic technique combines the accuracy of spectroscopy with the depth resolution of ultrasound.


The oldest technical application of the photothermal effect is believed to be the photophone, a communication device invented by Bell (1880). Bell observed the emanation of audible sounds from a transparent tube containing material in suspension, when a modulated light source is focused on the tube. Modulation of the light impinging on an absorbing substance will produce a similar modulation in temperature via the photothermal effect.

Optoacoustic wave generation

When a short laser pulse irradiates an absorbing medium there is local absorption →local heating → local expansion. This local expansion leads to ultrasonic pressure waves that travel through the medium at the speed of sound, and can be recorded using high frequency pressure sensors (such as piezoelectric sensors or optical sensors). The slow speed of sound in tissue (~1500 m/s) in comparison to the speed of light allows for the time resolved detection of these pressure waves and the determination of depth from where these pressure waves originated. By using an array of sensors the temporal delay of these incoming pressure wavefronts can be combined into an ultrasound image.

Proposed applications

Although the technology is still in its infancy, optoacoustic imaging is being employed in the development of various devices. Such devices include breast cancer detection equipment, as well as equipment used for measuring blood oxygenation levels. In both cases, the change in the optical properties of blood in respect to oxygen saturation and the strong optical contrast between hemoglobin and surrounding tissue is utilized.

External links

See also

Help WikiMD

Find something you can improve? Join WikiMD as an an editor and help improve this page or others.

Apple bitten.svg

WikiMD is a free medical encyclopedia and wellnesspedia moderated by medical professionals. Template:Technology-stubPortions of content adapted from Wikipedias article on Optoacoustic imaging licensed under GNU FDL.

W8MD logo

Ad. Tired of being overweight?. W8MD's insurance weight loss can HELP*

Lose weight King of Prussia, PA | Lose weight NYC | Lose weight NJ | Lose weight Philadelphia | Advertise

Quick links: Medicine Portal | Encyclopedia‏‎‏‎ | Gray's Anatomy‏‎ | Topics‏‎ |‏‎ Diseases‏‎ | Drugs | Wellness | Obesity‏‎ | Metabolic syndrome | Weight loss*
Disclaimer: The entire contents of WIKIMD.ORG are for informational purposes only and do not render medical advice or professional services. If you have a medical emergency, you should CALL 911 immediately! Given the nature of the wiki, the information provided may not be accurate, misleading and or incorrect. Use the information on this wiki at your own risk! See full Disclaimer.
Link to this page: <a href="http://www.wikimd.org/wiki/Optoacoustic_imaging">Optoacoustic imaging</a>

  • Individual results may vary for weight loss from our sponsors.

Our sponsors WikiMD is supported by W8MD weight loss, sleep and medical aesthetic centers.