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:8/29/2014)... A leading U.S. Ebola researcher from the University of Texas ... a blend of three monoclonal antibodies can completely protect monkeys ... days after infection, at a time when the disease is ... written an editorial for Nature discussing advances in ... Marburg virus are among the most deadly of pathogens, with ...
(Date:8/29/2014)... German . ... considered the oldest form of communication. Acting as messenger ... the sexual attraction between males and females. Fish rely ... reproductive behavior in males and females. Scientists at the ... in Faro, Portugal, and at the Max Planck Institute ...
(Date:8/29/2014)... of the Tibetan plateau -- the largest topographic anomaly ... both its profound effect on climate and its reflection ... GSA Bulletin , Katharine Huntington and colleagues employ a ... modern and fossil snail shells to investigate the uplift ... , Views range widely on the timing of surface ...
Breaking Biology News(10 mins):Leading Ebola researcher at UTMB says there's an effective treatment for Ebola 2Ready for mating at the right time 2Ready for mating at the right time 3Snails tell of the rise and fall of the Tibetan Plateau 2Snails tell of the rise and fall of the Tibetan Plateau 3Snails tell of the rise and fall of the Tibetan Plateau 4Snails tell of the rise and fall of the Tibetan Plateau 5Snails tell of the rise and fall of the Tibetan Plateau 6Snails tell of the rise and fall of the Tibetan Plateau 7
... of researchers from the Hawai,i Institute of Marine Biology ... and zooxanthellae as part of a hybrid web application ... and ecosystem information on symbiotic zooxanthellae called Symbiodinium ... the cells of other marine organisms like anemones, jellyfish, ...
... safe to say Northern Illinois University Biological Sciences Professor Virginia ... at her Hampshire, Ill. home. She also has focused her ... -- the prehistoric saber-tooths. Naples and two colleagues -- ... John Babiarz -- are editors of a new book on ...
... City Physicians preparing to deliver a baby look at ... or not to perform a C- section. But a new ... that those heart rate patterns may not be a good ... to unnecessary interventions and higher costs. "We,re trying to ...
Cached Biology News:An online global map of coral and zooxanthellae data for climate change study is released 2An online global map of coral and zooxanthellae data for climate change study is released 3NIU biologist Virginia Naples is helping put new face on ferocious saber-tooth cats 2NIU biologist Virginia Naples is helping put new face on ferocious saber-tooth cats 3New study finds fetal heart rate not a good indicator of a baby's health 2New study finds fetal heart rate not a good indicator of a baby's health 3
(Date:8/29/2014)... New York (PRWEB) August 29, 2014 ... valued at $5.6 billion in 2019. It is ... from 2013 to 2019, and was valued at ... report published by Transparency Market Research. , For ... visit: http://www.transparencymarketresearch.com/companion-diagnostics-market.html . , The research report, ...
(Date:8/29/2014)... Three Lawrence Livermore researchers have received ... R&D Award for their research in producing ... , Shared with collaborators from the National Renewable ... Las Vegas (UNLV), the award recognizes the team ... production and corrosion processes. , These models have ...
(Date:8/28/2014)... 2014 Best Sanitizers, Inc., a leader ... processing industry, is asking industry professionals to prepare for ... the E2 soap they’re currently using to the Best ... Hand hygiene is critical to fighting cross-contamination and ... Six key criteria are identified to evaluate the effectiveness ...
(Date:8/28/2014)... Aug. 28, 2014 ... market research report is available ... Whole Exome Sequencing Market by ... Target Enrichment), by Services (Sequencing), ... by Application (Cancer, Monogenic disorders) ...
Breaking Biology Technology:Companion Diagnostics Market to Hit $5.6 Billion in 2019: Transparency Market Research 2Companion Diagnostics Market to Hit $5.6 Billion in 2019: Transparency Market Research 3Livermore Team Awarded for Hydrogen Production Research 2Best Sanitizers, Inc. Asks Food Industry Professionals: With Fall Harvest On the Way, Is Your E2 Hand Soap Up to the Task? 2Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 2Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 3Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 4Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 5Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 6Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 7Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 8Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 9Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 10Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 11Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 12Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 13
... SolvayCARES Thriving Student ... -, MARIETTA, Ga., Sept. 15 Solvay Pharmaceuticals, ... with,cystic fibrosis (CF) through its SolvayCARES Scholarship program. Each,student ... finance,post-secondary education. This fall, one SolvayCARES Scholarship winner,will go ...
... Modigene Inc.,(OTC Bulletin Board: MODG), a biopharmaceutical ... of already approved,therapeutic proteins, today announced that President ... Life Sciences Conference at 2:00 PM EDT,on September ... company,s presentation will be webcast live.,It can be ...
... QC, Sept. 15 /PRNewswire-FirstCall/ - Neptune Technologies ... today,that its distributor Schiff Nutrition International Inc. ... (NKO(R)) in Walgreens,which represents the largest retail ... 6,400 drug stores nationwide. Schiff(R) MegaRed(TM) has ...
Cached Biology Technology:40 High-Achieving Students with Cystic Fibrosis Receive $100,000 Total in Higher Education Scholarships From SolvayCARES(SM) 240 High-Achieving Students with Cystic Fibrosis Receive $100,000 Total in Higher Education Scholarships From SolvayCARES(SM) 340 High-Achieving Students with Cystic Fibrosis Receive $100,000 Total in Higher Education Scholarships From SolvayCARES(SM) 4Neptune Krill Oil, NKO(R), enters WALGREENS, the largest U.S. retail pharmacy chain, under the brand name Schiff(R) MegaRed(TM) 2Neptune Krill Oil, NKO(R), enters WALGREENS, the largest U.S. retail pharmacy chain, under the brand name Schiff(R) MegaRed(TM) 3
... Label Transfer Sulfo SBED Protein:Protein Interaction Reagent ... Label Transfer has rapidly gained traction as ... discovery. A growing number of publications feature ... Transfer Reagent to study a variety of ...
... is a compact benchtop and stackable ... controller with a large display screen ... speed. Air circulation inside to evenly ... can be easily calibrated from the ...
... siTrio siRNA --- a cocktail of 3 ... of interestis our most popular product. The ... 75% knockdown of your target gene when ... for transfection and confirmation of optimal transfection ...
... siTrio siRNA --- a cocktail of 3 ... of interestis our most popular product. The ... 75% knockdown of your target gene when ... for transfection and confirmation of optimal transfection ...
Biology Products: