Gold Nanoparticles, Three Types of Imaging Used to Remove Brain Tumors
April 16, 2012 8:29 PM
comment(s) - last by
Stanford University researchers can completely remove tumors without harming healthy tissue
Stanford University researchers have combined tiny, laboratory-made nanoparticles with three imaging methods to successfully remove brain tumors entirely.
Sam Gambhir, MD, Ph.D, study leader and professor and chair of radiology at Stanford University School of Medicine, has created tiny nanoparticles that are capable of highlighting tumor tissue both before and during removal with the help of three imaging techniques. This not only helps researchers remove brain tumors completely, but it also allows them to avoid messing with healthy brain tissue.
Brain tumors are not easy to remove. The major issue with removal is making sure to leave as much healthy brain tissue intact as possible. On the other hand, this means that some cancer cells could be left behind that aren't visible to the surgeon's eye, or are embedded in healthy tissue.
Glioblastomas, which are rough-edged tumors with finger-like projections that invade healthy tissues, and micrometastases, which are tiny tumor patches created by the replication of cells from the primary tumor, are two major issues with tumor removal as well.
But now, Gambhir has created a new technique that could help the 14,000 U.S. citizens
diagnosed with brain cancer annually
. The nanoparticles he developed are small, gold spheres that measure less than about five one-millionths of an inch in diameter. They are coated with an MRI contrast agent called gadolinium, and are injected intravenously to surround tumor tissue, but not healthy tissue.
The blood vessels that sustain a brain tumor are leaky, and the nanoparticles end up bleeding out of these vessels and embedding themselves in tumor tissue. Then, using their enhanced gold cores, they become visible using three different types of imaging.
The first type is the standard magnetic resonance imaging (MRI), which identifies a tumor's boundaries before surgery. However, MRI alone cannot determine the growing tumor's position during surgery.
That's where photoacoustic imaging comes in. This method uses pulses of light that are absorbed by the gold cores in the nanoparticles, and
causes the particles to heat up
. This creates a detectable ultrasound and produces a three-dimensional image of the tumor. This allows for removal of the tumor during surgery.
The third and final imaging method is called Raman imaging, which causes a layer of the gold nanoparticles to radiate nearly undetectable amounts of light in certain patterns. The gold cores enhance the signals from the Raman imaging so that a microscope can catch them. After the tumor is removed via MRI and photoacoustic imaging, Raman is used to show micrometastases that are left behind in healthy tissue. This allowed for the removal of these projections.
This isn't the first time gold nanoparticles were used to fight cancer. Back in 2008,
MIT researchers used gold nanoparticles
, which can melt when exposed to certain wavelengths of infrared light, to carry drugs into the body and release them in certain areas of the body.
This article is over a month old, voting and posting comments is disabled
Good Job Guys!
4/16/2012 9:02:58 PM
... but are you sure it wasn't just zombies that snuck into the lab after you went home?
RE: Good Job Guys!
4/17/2012 2:09:34 AM
I refuse to live in a world were zombies get cancer-fighting golden lasers before sharks.
These products are commercially available!
4/17/2012 10:49:27 AM
Nanopartz Inc. (www.nanopartz.com), currently sells gold nanoparticles for in vivo imaging and therapeutics. Their gold nanoparticles (gold nanorods) are used for Raman imaging (www.nanopartz.com/ramanprobes.asp), Photoacoustic tomography (www.nanopartz.com/invivo_gold_nanoparticles.asp), and cancer therapy (www.nanopartz.com/invivo_therapeutics_ntracker.asp ).
“So far we have not seen a single Android device that does not infringe on our patents." -- Microsoft General Counsel Brad Smith
Aggressive Brain Cancer Tumors Destroyed by Heat
February 2, 2011, 9:23 AM
Gene Deletion Contributes to Common Adult Brain Cancer
December 23, 2010, 6:45 PM
Gold Nanoparticles Don't Just Look Pretty, They Fight Cancer
December 31, 2008, 1:20 PM
Creationists are Mad About Google Doodle Depicting Evolution
November 24, 2015, 8:48 PM
DHS and TSA: Whoops, We Missed That 73 Airport Employees May be Terrorists
November 19, 2015, 2:16 PM
Star Wars Spinoff Film "Rogue One", Theme Park Attractions Announced
August 17, 2015, 12:20 PM
SpaceX Falcon 9's Seventh Supply Mission to ISS Ends w/ Fiery Stage 1 Explosion
June 28, 2015, 1:10 PM
Cool Science Video: Glowing Millipede Prowls the Nevada Desert
May 18, 2015, 12:00 PM
Newly Discovered Costa Rican Glass Frog is Kermit's Doppelgänger
April 22, 2015, 11:26 AM
Latest Blog Posts
Sceptre Airs 27", 120 Hz. 1080p Monitor/HDTV w/ 5 ms Response Time for $220
Dec 3, 2014, 10:32 PM
Costco Gives Employees Thanksgiving Off; Wal-Mart Leads "Black Thursday" Charge
Oct 29, 2014, 9:57 PM
"Bear Selfies" Fad Could Turn Deadly, Warn Nevada Wildlife Officials
Oct 28, 2014, 12:00 PM
The Surface Mini That Was Never Released Gets "Hands On" Treatment
Sep 26, 2014, 8:22 AM
ISIS Imposes Ban on Teaching Evolution in Iraq
Sep 17, 2014, 5:22 PM
More Blog Posts
Copyright 2016 DailyTech LLC. -
Terms, Conditions & Privacy Information