Navigation Links
Seeing melanoma
Date:8/11/2010

he temperature rise causes thermoelastic expansion.

"Much the same thing happens," says Wang "when you heat a balloon and it expands."

If the light is pulsed at the right frequency, the material will expand and contract, generating a sound wave.

"We detect the sound signal outside the tissue, and from there on, it's a mathematical problem," says Wang. "We use a computer to reconstruct an image."

"We're essentially listening to a structure instead of looking at it," says Wang.

"Using pure optical imaging, it is hard to look deep into tissues because light is absorbed and scattered," Wang explains. "The useful photons run out of juice within one millimeter."

Photoacoustic tomography (PAT) can detect deep structures that strongly absorb light because sound scatters much less than light in tissue.

"PAT improves tissue transparency by two to three orders of magnitude," says Wang.

Moreover, it's a lot safer than other means of deep imaging. It uses photons whose energy is only a couple of electron-volts, whereas X-rays have energies in the thousands of electron-volts. Positron emission tomography (PET) also requires high-energy photons, Wang says.

A smart contrast agent

Photoacoustic images of biological tissue can be made without the use of contrast agents, particularly if tissues are pigmented by molecules like hemoglobin or melanin.

Still, photoacoustic images of melanomas are fuzzy and vague around the edges. To improve the contrast between the malignant and normal tissue, Xia loads the malignant tissue with gold.

"Gold is much better at scattering and absorbing light than biological materials," Xia says. "One gold nanocage absorbs as much light as a million melanin molecules," says Xia.

Xia's contrast agent consists of hollow gold cages, so tiny they can only be seen through the color they collectively lend to the liquid in which they flo
'/>"/>

Contact: Diana Lutz
dlutz@wustl.edu
314-935-5272
Washington University in St. Louis
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Seeing a bionic eye on medicines horizon
2. Seeing the hidden services of nature
3. Seeing the brain hear reveals surprises about how sound is processed
4. Seeing the forest through the trees and seeing the trees through the leaves
5. Seeing without looking
6. Seeing how evolutionary mechanisms yield biological diversity
7. Seeing family for the holidays? Scientists discover how the stress might kill you
8. Seeing is relieving
9. Seeing previously invisible molecules for the first time
10. Seeing the tree from the forest: Predicting the future of plant communities
11. Seeing stem cells helps in fight against peripheral arterial disease
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Seeing melanoma
(Date:2/25/2015)... Ark. , Feb. 25, 2015  ABC ... and billing in the Health and Fitness Industry, ... well as to MYiCLUBonline.  The latest upgrade includes ... the inclusion of cardless check-in via Identity One ... the first time through interactive displays at the ...
(Date:2/19/2015)... Feb .19, 2015 Research and Markets ... of the "Military Electro-Optical / Infrared Systems ... by Platform - Forecast to 2020" report ... electro-optical/infrared systems market is expected to reach $16.35 ... 7.71%. This report segments the military ...
(Date:2/11/2015)... 2015 According to ... Market by Product (Cards and Readers, Biometrics, Controllers, Management ... Industrial, Healthcare, Education) and By Geography - Global Forecast and Analysis ... Access Control Market is expected to reach ... CAGR of 10.6% between 2014 and 2020. ...
Breaking Biology News(10 mins):ABC Financial Unveils New Software Enhancements 2ABC Financial Unveils New Software Enhancements 3Military Electro-Optical / Infrared Systems (Image Intensification, Laser, Infrared) Market - Forecast to 2020: Featuring Profiles of the Market Leaders on this $16 Billion market 2Military Electro-Optical / Infrared Systems (Image Intensification, Laser, Infrared) Market - Forecast to 2020: Featuring Profiles of the Market Leaders on this $16 Billion market 3Access Control Market Worth $10.4 Billion by 2020 2Access Control Market Worth $10.4 Billion by 2020 3Access Control Market Worth $10.4 Billion by 2020 4
... 2008 -- With reducing carbon emissions on the national agenda, ... and policy issues on how carbon sinks or carbon sequestration ... Carbon sequestration is the process through which carbon dioxide (CO ... and crops through photosynthesis, and stored as carbon in biomass ...
... tomography to Google searches, higher mathematics and computation are ... The University of Pennsylvania,s new graduate program in ... symposium to spotlight the frontiers of research and provide ... Talks will be given by international leaders in subjects ...
... restoration projects to protect storm buffeted infrastructure along the ... that provides "false hope" and prevents endangered communities from ... Western Carolina University (WCU). As hurricanes have ... has been filled with the words of politicians, policy ...
Cached Biology News:Carbon sinks: Issues, markets, policy 2Wetlands restoration not a panacea for Louisiana coast 2Wetlands restoration not a panacea for Louisiana coast 3
(Date:3/6/2015)... 2015 Health eCareers, the only online single-source ... this week announced the launch of ENA Job ... The ENA Job Center provides a powerful venue ... find job openings and for employers to reach the ... in the field. Job seekers now ...
(Date:3/6/2015)... , March 6, 2015  Attorney Advertising-- Bronstein, ... on behalf of purchasers of the securities of ... OREX -News).  Such investors are ... his investor relations coordinator Eitan Kimelman ... The investigation concerns whether Orexigen and certain of ...
(Date:3/6/2015)... VA (PRWEB) March 06, 2015 Anton ... sodium hydroxide concentration by utilizing laboratory refractometers. Sodium ... is used in producing a variety of products including ... base is a staple of the chemical industry; its ... petroleum – and nearly everything in between. NaOH ...
(Date:3/5/2015)... ARLINGTON, Va. , March 5, 2015   ... selected as semi-finalists in the HX360 Innovation Challenge ... eighty-three entries, will compete to be chosen as one ... a panel of senior health system executives and venture ... The HX360 Innovation Challenge takes place at the 2015 ...
Breaking Biology Technology:Health eCareers Announces Online Career Center for the Emergency Nurses Association 2Health eCareers Announces Online Career Center for the Emergency Nurses Association 3SHAREHOLDER ALERT: Bronstein, Gewirtz & Grossman, LLC Announces Investigation of Orexigen Therapeutics, Inc. 2HX360 Announces Sixteen Innovation Challenge Semi-finalists Competing To Deliver Solutions That Improve The Patient Experience 2HX360 Announces Sixteen Innovation Challenge Semi-finalists Competing To Deliver Solutions That Improve The Patient Experience 3HX360 Announces Sixteen Innovation Challenge Semi-finalists Competing To Deliver Solutions That Improve The Patient Experience 4
... Italy, November 10 Health-Robotics today,announced that ... Automation since,1971, has selected Health Robotics, CytoCare(TM) ... by TOSHO,s engineering and management,teams, and by ... process included multiple visits to Health Robotics, ...
... Delivery Technology and own Pipeline ... ... 10 Critical,Pharmaceuticals, the speciality pharmaceuticals company, today announced,that it ... on the company,s success in developing its unique,CriticalMix delivery technology ...
... and research group Plasma & Materials Processing (PMP) of ... awarded the Leverhulme Technology Transfer Award 2008. They receive ... for the research group) for their successful transfer of ... Hoex,s Ph.D. research was rewarded with the SolarWorld Junior ...
Cached Biology Technology:Health Robotics Announces Strategic Partnership in Japan for its CytoCare(TM) Robot with TOSHO Inc. 2Health Robotics Announces Strategic Partnership in Japan for its CytoCare(TM) Robot with TOSHO Inc. 3Health Robotics Announces Strategic Partnership in Japan for its CytoCare(TM) Robot with TOSHO Inc. 4Critical Pharmaceuticals Raise GBP650K 2Critical Pharmaceuticals Raise GBP650K 3TU/e awarded for knowledge transfer to solar energy industry 2
... by a modification of the procedure ... Bioeng., 11 , 1055 ... yield an A 260 of ... (1 cm light path). Physical Form: ...
... White solid.. PACKAGED UNDER INERT GAS. ... reaction is "driven" to completion. A protective agent ... found in many other preparations. Blocks the lethal ... by titration. Contaminants: Heavy metals: ≤1 ...
... Basically, most ``special`` dye stains ... a few other non-routine) stains are ... of a paraffin block, staining, coverslipping ... Stain (for senile plaques) ,Bodian`s Stain ...
... pombe Whole Genome ChIP-on-chip Microarray is ... yeast (S. pombe) DNA binding proteins ... Agilent DNA microarrays. This set delivers ... with greater true binding events and ...
Biology Products: