how brain tumor treatment by lasers work?
441731
They use lasers to excise the tumor.  It's basically like a very precise scapple.
606924
See: http://www.nlm.nih.gov/medlineplus/ency/article/000521.htm#Treatment
202994
Try:\nhttp://www.nlm.nih.gov/medlineplus/ency/article/001177.htm#Treatment
129844
A laser light as you described is not going to cause eye damage by looking at it as most are lead to believe. That is also true about having a laser pointer being pointed into one's eye. You eyes will become injured more so if you look at the sun.\n\nIf you have nothing better to do but to look at the bottom of your mouse, then you have other problems... ;=)
712963
Hard to believe ibuprofen will relieve brain tumor. Check your blood pressure, your eye sight and stay away from stress and from computer screen.
544230
I've had laser treatment done, and it works good. I had alot of tiny red veins on my cheeks, and now their pretty much gone.
207095
It was once said by Sir Townes, who is credited with inventing the first working ruby Laser, that the laser is a remarkable device looking for an application.  That was in 1968.  Today, there are numerous applications for lasers.\n\nLasers are used in medicine: for eye surgery, eye treatments and corrections to the cornea, in major surgeries ultrafst lasers are used because theyt have very short pulses with high peak power, which means they will cut the spots they are focused on while not affecting the areas around the focused spot (i.e., very little or no heat damage to surrounding tissue).  THe same principle is why we use lasers in eye surgery.  Also, different tissue absorbs different wavelengths of light, so specific wavelengths of lasers may be developed to be absorbed by specific types of tissue, like cancerous tissue, for example.  Cancerous breast tissue absorbs longer wavelengths of light than normal breast tissue, so if one spots a long wavelength (inra-red) laser beam on the breast, it only affects the cancerous issue, as it passes right through the normal tissue and doesn't affect it.  When tissue is heated, enough, it will die.  Hence cancer therapy with lasers.\n\nLasers are used in industry for materials processing (welding, cutting, drilling).  The advantage of using lasers in this area are that the cuts are very clean (or holes, or welds) and the laser can be attached to robotics that are automated to perform repetitive cuts very quickly.  Laser pulses from pulse to pulse are quite stable, when properly designed, so the repeatability in manufacturing applications is tremendous, far better than mechanical cutting, drilling, and traditional MIG or TIG welding.\n\nLaers are used for imaging.  The wavelength of lasers ranges from the deep UV (~200 nm) to the far infra-red (~10 um).  The shorter wavelengths of light act of small cameras when refelcted back from a sample, for example of human biological tissue or even molecules themselves.  So the laser can be a very high resolution imaging "camera".\n\nLasers are used in rapid prototyping for developing 3D models of products very quickly, they are used in disk drive manufacture to create "landing pads" on the disk drives for the disks to remain stable when being written to or read from, and are used in the interest of national security (i.e., weapons systems).  Lasers can be used as sensors, even very long range remote sensors (LIDAR), as motion detection devices, and as pure research tools.\n\nThere are more, but that gives you an idea.
378447
As far as is known, cells dont generate any particular frequency, other than the waveforms generated in the brain and heart by large masses of cells depolarizing together.  Since you are talking about tumors, which are cancer cell masses, then it is possible to detect them based upon average densitiy and water content, which tends to be different in cacner cells than surrounding tissue, and this is done through MRI.
101307
well, you kinda answered your own question. The laser optics refers (here) to the use of mirrors to focus the light on the sample, this is normally used for a fluorescent dye which has been used to stain a part of the cell.
107171
There are intracellular repair mechanisms that might repair the DNA by reading off from the other strand and rebuilding it.  This is, of course, not unique to using lasers to zap the DNA.\n\nIf BOTH strands are broken, there are still times when repair might be achieved--it sort of matters how the backbone of the DNA gets broken, here--but if there is damage to the same areas of both strands of DNA, you have a mutation, which might change the function of the gene, or might shut the gene off altogether (by so deforming the gene that its product, or its other function is not able to work).
730353
vagus nerve therapy (that they implant in your brain)?\n\nhttp://www.vnstherapy.com/
918852
It will depend on where the tumor is located (since the symptoms vary within parts of the brain) and on the size. \nSome tumors don't give any symptoms, at least until they are big enough to start causing some local inflammatory reactions or pushing some nerves away. Roughly, it could give headaches (very unspecific), dizziness, numbness in any place of face/body, paralysis of some parts of the body/face like an arm, leg, mouth etc, problems with the vision (seeing double...), even changes in the personality like aggression, etc.
378845
i am sorry about ur grief. i will try my best to give the best information i can. but u wouldnt mind if its long enough? do u?\nA brain tumor is any intracranial mass created by an abnormal and uncontrolled growth of cells either normally found in the brain itself: neurons, glial cells (astrocytes, oligodendrocytes, ependymal cells), lymphatic tissue, blood vessels), in the cranial nerves (myelin-producing Schwann cells), in the brain envelopes (meninges), skull, pituitary and pineal gland, or spread from cancers primarily located in other organs (metastatic tumors).\n\nPrimary (true) brain tumors are commonly located in the posterior cranial fossa in children and in the anterior two-thirds of the cerebral hemispheres in adults, although they can affect any part of the brain.\n\nIn the United States in the year 2000, it was estimated that there were 16,500 new cases of brain tumors[1], which accounted for 1.4% of all cancers, 2.4% of all cancer deaths[2], and 20%–25% of pediatric cancers[2],[3]. Ultimately, it is estimated that there are 13,000 deaths/year as a result of brain tumors[1].\n\nAside from exposure to vinyl chloride or ionizing radiation, there are no known environmental factors associated with brain tumors. Mutations and deletions of so-called tumor supressor genes are incriminated in some forms of brain tumors. Patients with various inherited diseases, such as Von Hippel-Lindau syndrome, multiple endocrine neoplasia, neurofibromatosis type 2 are at high risk of developing brain tumors.In contrast to tumors originating elsewhere in the body, differentiating primary "brain tumors"—these are the true brain tumors, arising exclusively from cells normally present in the brain itself—into benign and malignant is of relative and limited clinical value, since even histologically-benign tumors grow by infiltration of healthy brain tissue and, in time, tend to transform into malignant forms (anaplastic degeneration). True benign intracranial tumors arise mainly from the meninges (meningiomas; about 95% are benign), pituitary gland (pituitary adenomas) and the myelin sheath of cranial nerves (neuromas or Schwanomas, e.g. acoustic neuroma).\n\nMost primary brain tumors (gliomas) originate from glia: astrocytes (astrocytomas), oligodendrocytes (oligodendrogliomas). There are also mixed forms, with both an astrocytic and an oligodendroglial cell component. These are called mixed gliomas or oligoastrocytomas. Additionally, mixed glio-neuronal tumors (tumors displaying a neuronal, as well as a glial component, e.g. gangliogliomas, disembryoplastic neuroepithelial tumors) and tumors originating from neuronal cells (e.g. gangliocytoma, central gangliocytoma) can also be encountered.\n\nOther varieties of primary brain tumors include: primitive neuroectodermal tumors (PNET, e.g. medulloblastoma, medulloepithelioma, neuroblastoma, retinoblastoma, ependymoblastoma), tumors of the pineal parenchyma (e.g. pineocytoma, pineoblastoma), ependymal cell tumors, choroid plexus tumors, neuroepithelial tumors of uncertain origin (e.g. gliomatosis cerebri, astroblastoma), etc.\n\nFrom a histological perspective, astrocytomas, oligondedrogliomas, and oligoastrocytomas may be benign or malignant. Glioblastoma multiforme represents the most aggressive variety of malignant glioma. At the opposite end of the spectrum, there are so-called pilocytic astrocytomas, a distinct variety of astrocytic tumors. The majority of them are located in the posterior cranial fossa, affect mainly children and young adults, and have a clinically favorable course and prognosis.\n\nIn contrast to other types of cancer, primary brain tumors rarely metastasize, and in this rare event, the tumor cells spread within the skull and spinal canal through the cerebrospinal fluid, rather than via bloodstream to other organs.\n\nThere are various classification systems currently in use for primary brain tumors, the most common being the World Health Organization (W
59990
It depends on the type of tumor, her spirit and her Dr's. My wife suffered from a Glioblastoma Multiforme, a Grade IV tumor. Many Dr's continue to use the same treatments that were available in the 70's. If they did not work then, they do not work now.\n\nYour friend should immediately try to get in touch with someone from the Preston Robert Tisch Brain Tumor Center at Duke, they are considered the best in the world and have saved my wife's life.\n\nhttp://cancer.duke.edu/btc/\nhttp://cancer.duke.edu/btc/Treatment/PatientReferralInfo.asp
651392
None of these are right. An LED wouldn't work without QM (Quantum mechanics).\nA laser is a laser because the dominant process producing light is stimulated emission (StE). LEDs are dominantly spontaneous emission (SpE). As the name suggest SpE is light that just happens, it's spontaneous. StE on the other hand requires photons to seed it, one goes in two come out. Due to this the photons from StE are more "alike" as they are modelled on each other. The key value for a laser is it's threshold. This is the value above which it is a laser, i.e. when the StE process is strong enough to overcome the loss of light in the laser.\n\nedit: sorry couldn't keep quiet, these answers are getting worse. Lasers do NOT have more power than LEDs, for the same size they have LESS power. They do however have higher spectral densities (i.e. more power per unit wavelength). They do NOT have to be collimated. The laser pointers everyone runs around with are only collimated because there is a lens on the front. The laser inside it isn't collimated at all.
590295
Theres too much it can do! I think the world is using mostly lasers for surgeries now because it is safer and more precise.\n\nWe use lasers for corrective eye surgery, to get rid of hair on our body permanently...and now theres liposuction with lasers!\n\nIts used widely for cosmetic surgery.\n\nOther uses are for reading bar codes, for laser tag games, virtual games, and to read discs and cds. Its limitless!
1174999
It'd be pretty complicated, but one way might be...\n\nUse the radio waves to heat something.  Connect a heat engine between the warmed object and one at room temperature.  Use the heat engine to run a generator.  Use the generator to charge a battery, and then connect the battery to a light bulb (or laser, or some other thing that emits visible light).  Voila!\n\nAnother way you might be considering is something analogous to frequency doubling-- shine laser light of some wavelength on a crystal, and out from the other end comes laser light with double (or sometimes triple) the frequency.  This won't work with radio waves because they simply don't have enough energy.  Frequency doubling works because of nonlinear effects that take place in the crystal.  Radio waves are not energetic enough to produce nonlinear effects.