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:4/14/2015)... 2015  HYPR Corp. today announced it has ... Alliance tm , an industry consortium transforming online ... share technology and collaborate to deliver open specifications ... secure and private, and easier to use. ... protects sensitive user information and eliminates the dependency ...
(Date:4/13/2015)... According to a recently ... & Opportunities, 2020", the global biometrics market is ... till 2020. The biometrics market is garnering attention ... review of biometric management systems. The constant development ... greater efficiency, are resulting in increasing installation of ...
(Date:4/10/2015)... -- Research and Markets ( http://www.researchandmarkets.com/research/cjk4gb/security ) ... Profiles - NEC" report to their offering. ... continue to supply a range of IT security management ... focus on the development of a Big Data and ... the Asia-Pacific region is a ...
Breaking Biology News(10 mins):HYPR Corp. Joins the FIDO Alliance 2HYPR Corp. Joins the FIDO Alliance 3Global Biometrics Market to Cross US$ 21 Billion by 2020: TechSci Research 2NEC Security Competitive Profile 2015 2
... screening the genome of hundreds of thousands of individuals ... more than 100 regions in the genome to the ... Molecular Biology Laboratory (EMBL) and the University of Heidelberg, ... taking these results one step further by pinpointing the ...
... 2013) "Green" chemistry developed at Rice University is at ... waste into fatty acids, and then into fuel. The ... recently announced $25 million United States Department of Agriculture project ... products from switchgrass and forestry residues and from a new ...
... have been a source of great controversyparticularly in Europebut ... scientific evidence about the health and ecological impacts of ... field site dedicated for use in GM crop studies ... interested in pursuing crop biotechnology, according to an article ...
Cached Biology News:Zeroing in on heart disease 2Modified bacteria turn waste into fat for fuel 2Modified bacteria turn waste into fat for fuel 3Fighting GM crop vandalism with a government-protected research site 2
(Date:4/24/2015)... 2015 DryLet, LLC a biotechnology ... such as animal waste reduction, bioremediation, wastewater treatment, ... wastewater treatment plants and restaurant kitchen settings, announced ... National Restaurant Association’s NRA Show 2015, in Chicago, ... the company will be available to share information ...
(Date:4/24/2015)... April 24, 2015 /CNW Telbec/ - Mirego, leader in mobile ... making of three mobile app extensions for the all new ... its clients, Familiprix, OMSignal and MediaMiser, these extensions will reinvent ... functions designed specifically for wrist use.  Available ... is a highly customizable tactile smartwatch that makes for an ...
(Date:4/24/2015)... Seoul Semiconductor announced the expansion of ... the lighting market. In recent months, there ... in emerging markets such as Russia, South America, ... applications such as streetlight and area lighting, tunnel ... launched in 2005 the Acrich technology from Seoul ...
(Date:4/23/2015)... Dora, Florida (PRWEB) April 23, 2015 ... that it intends to conduct a groundbreaking pilot ... begin to be reversed in as little as ... the science of metabolic and nutritional medicine—will aggressively ... that cripple and destroy our aging brain. These ...
Breaking Biology Technology:DryLet to Showcase Bio-React at the National Restaurant Association’s NRA Show 2015 May 16-19, 2015 in Chicago, Illinois 2Familiprix, OMSignal and MediaMiser apps available today for Apple Watch 2Acrich Technology from Seoul Semiconductor Adopted in Installations Worldwide 2New Study Looks to Reverse Alzheimer’s Disease 2New Study Looks to Reverse Alzheimer’s Disease 3
... Hu of China - Source: Getty Images The Olympics ... four years. They're held every year. Though this is still ... as the pervasive growth of the industry becomes part of ... every four years and last two weeks, the biotech Olympics ...
... MADISON, Wis. - Ownership and accountability is the way ... 448-bed community hospital in Madison that provides medical care ... living facility, laboratories and a home health care service. ... Methodist Hospital in 1987, Meriter includes more than 430 ...
... trend three years ago many companies cut their information ... the price of computers dropped, allowing businesses to inexpensively ... grew. Many IT staffers are wary of returning to ... looked to begin working as an outside IT source, ...
Cached Biology Technology:The Olympics: A Biotech Perspective 2The Olympics: A Biotech Perspective 3Meriter IT team builds project performance through internal relationships 2Meriter IT team builds project performance through internal relationships 3Meriter IT team builds project performance through internal relationships 4Expetec expands IT staff services in Wisconsin 2Expetec expands IT staff services in Wisconsin 3
Anti-Kusabira Orange Monoclonal Antibody Description: 100 g Research Focus: tag Storage: -20C Shipping Temperature: 4C...
CD69/CD3 50 tests...
PURA Immunogen: PURA (NP_005850, 183 a.a. ~ 293 a.a) partial recombinant protein with GST tag. Storage: -20 C, Avoid Freeze/Thaw Cycles *Available for distribution in the US only...
Rat polyclonal to Vitamin B3 ( Abpromise for all tested applications). Antigen: Chemical / Small Molecule, Vitamin B3 conjugated to BSA....
Biology Products: