[permalink] [id link]
The Gamma Knife ( also known as the Leksell Gamma Knife ) is a creation of Elekta AB, a Swedish public company, used to treat brain tumors by administering high-intensity cobalt radiation therapy in a manner that concentrates the radiation over a small volume.
from
Wikipedia
Some Related Sentences
Gamma and Knife
* Lars LeksellSwedish neurosurgeon who developed the Gamma Knife
* Lars Leksell ( 1907 – 1986 ), physician, inventor of radiosurgery and the Gamma Knife.
Cobalt treatment still has a useful role to play in certain applications ( for example the Gamma Knife ) and is still in widespread use worldwide, since the machinery is relatively reliable and simple to maintain compared to the modern linear accelerator.
In September, 1992, he had Gamma Knife surgery, which obliterated the AVM.
It has 17 radiation treatment machines, all of which are equipped with the latest technologies, a superficial ortho-voltage X-Ray machine, and operates a Gamma Knife stereotactic radiosurgery machine in collaboration with Toronto Western Hospital.
The latest radiosurgery technology available as of 2009 included the CyberKnife and Gamma Knife systems, the Novalis Tx radiosurgery platform, and the Trilogy linear accelerator by Varian.
The U. S. Food and Drug Administration ( FDA ) regulates these devices, whereas the Gamma Knife is regulated by the Nuclear Regulatory Commission.
Nuclear Regulatory Commission | NRC graphic of the Leksell Gamma Knife
A Gamma Knife typically contains 201 cobalt-60 sources of approximately 30 curies ( 1. 1 TBq ), each placed in a circular array in a heavily shielded assembly.
Gamma Knife therapy, like all radiosurgery, uses doses of radiation to kill cancer cells and shrink tumors, delivered precisely to avoid damaging healthy brain tissue.
Gamma Knife radiosurgery is able to accurately focus many beams of high-intensity gamma radiation to converge on one or more tumors.
Gamma Knife radiosurgery has proven effective for patients with benign or malignant brain tumors up to 4 centimeters in size, vascular malformations such as an arteriovenous malformation ( AVM ), pain or other functional problems.
These systems differ from the Gamma Knife in a variety of ways.
The Gamma Knife produces gamma rays from the decay of Co-60 of an average energy of 1. 25 MeV.
The Gamma Knife has over ~ 200 sources arrayed in the helmet to deliver a variety of treatment angles.
Cyberknife may be compared to Gamma Knife therapy ( see above ), but it does not use radioisotopes and thus by definition, does not use gamma rays.
In 1968, they developed the Gamma Knife, a new device exclusively for radiosurgery, which consisted of radioactive sources of Cobalt-60 placed in a kind of helmet with central channels for irradiation, using gamma rays.
This is called the Leksell Gamma Knife Perfexion.
The latest radiosurgery technology available as of 2009 included the CyberKnife and Gamma Knife systems, the Novalis Tx radiosurgery platform, Trilogy linear accelerator, and Tomotherapy.
* Gamma Knife Surgery for Tumors and Arteriovenous Malformations-University of Virginia Radiosurgical Center
* Gamma Knife Radiosurgery-Neurologic & Orthopedic Hospital of Chicago
Gamma and also
Two Pacific constellations also included Gamma Centauri.
Gamma, delta, epsilon, and zeta ( γ, δ, ε, and ζ-carotene ) also exist.
White was also a member of the Aleph Samach and Quill and Dagger societies and Phi Gamma Delta ( FIJI ).
He was also a member of the Alpha Gamma Rho Fraternity, Pi chapter.
* Gamma is also a non-SI unit of measure of magnetic flux density, sometimes used in geophysics, equal to 1 nanotesla ( nT ).
TSR also produced four packs of Gamma World miniatures.
Sword & Sorcery Studios also published three paperback supplements for the d20 version of Gamma World:
Gamma rays, however, are not absorbed or attenuated by atmospheric gases, and can also escape from deep within the sample with minimal absorption.
* 54px J ( also called " inverted L " or " Gamma "): a row of three blocks with one added below the right side.
* Navi ( Ivan backwards ), a star also named Gamma Cassiopeiae: Grissom and one of his flight crews had used the star to calibrate their equipment, wrote the name in logs as a joke and it eventually stuck.
Hooke also was an early observer of the rings of Saturn, and discovered one of the first observed double-star systems, Gamma Arietis, in 1664.
It was also one of the first cartoons whose animation was outsourced ; storyboards were shipped to Gamma Productions, the same Mexican studio employed by Total Television ).
He was also a member of the fraternity of Phi Gamma Delta.
The Fraternity of Phi Gamma Delta, also known as Fiji or Phi Gam, is the other fraternity present at the university.
The continuous flow of cosmic rays bombarding space objects, such as the Moon, generate this radiation Gamma rays also result in bursts from nuclear reactions.
Gamma and vega are also important but not as closely monitored.
Merton College is also rumoured to be the college of the founding members of the alleged Haxley Society, a university-wide establishment and reportedly a chapter of Yale's similarly prestigious Gamma Gamma Phi fraternity.
He also served as President of the Omega Chapter of the fraternity of Phi Gamma Delta.
During this time, he also started working with the political satire and comedy group Los Rayos Gamma, together with journalist Eddie López.
Because it is on the boundary of Taurus and Auriga, it also has the redundant Bayer designation Gamma Aurigae ( γ Aur ), which today is rarely used.
There are also seven fraternities existing at Western, Alpha Epsilon Pi, Phi Gamma Delta, Delta Upsilon, Pi Kappa Alpha, Lambda Chi Alpha, Sigma Chi, and Kappa Alpha Society.
Helloween were headlining and Gamma Ray were labeled as the " very special guest " with most shows also having fellow German " guest " Axxis.
Campion Hall is home to the honors floor with approximately 25 first year students as well as upperclassmen students and also home to three locked sorority suites: Kappa Alpha Theta, Chi Omega, and Gamma Phi Beta.
ISU is also the home of the Gamma Phi Circus, the oldest collegiate circus in the world, founded in 1929.
0.381 seconds.