Sign in Register Account

Fournissant des nouvelles de dispositif médical est notre service pour nos clients.Parce qu'il a les dernières nouvelles de l'industrie des dispositifs médicaux, nous sommes minutieusement choisis parmi d'autres canal et même nouvelles MSL sommes arrivé dans notre pays.Si cela ne pouvait pas nourrir votre besoin, vous pouvez voir la connaissance de l'équipement médical dans notre site Web.

Proton-Beam Radiotherapy

Clicks:Updated:2019-12-24 16:12:06

Excluding electron beams,which,as noted,have limitations for treatment of deep tumors,protons are presently the primary beams used in particle-beam therapy.A number of cyclotrons,originally operated as nuclear research facilities,have since been converted for use as medical equipments treatment facilities.A conventional cyclotron i.e.,one that uses a fixed radio frequency (RF) accelerating voltage and a single large conventional magnet is typically limited in proton beam energy to less than 80 MeV,which limits the penetration depth to less than a few cm in tissue.
Hence,these facilities (about one-third of all proton-beam therapy facilities) are generally limited to treatment of shallow tumors,especially eye tumors,or for treatment of certain noncancerous conditions such as age-induced macular degeneration (AMD) (10,12,48,49).As many of these facilities are located in a nuclear research laboratory rather than in or near a hospital,certain treatments requiring fractionated doses or treatment done in combination with other modalities can be problematic.
medical equipments
Treatment of deep-seated tumors requires a proton beam energy of 200 MeV or more.At this energy,the protons’ relativistic increase of mass with increasing velocity requires the use of a large separated-sector cyclotron or high field cyclotron,such as those in use at Indiana University,Massachusetts General Hospital,and elsewhere,or a "race track" synchrotron adapted from high energy physics.An example of the latter is the synchrotron at the Loma Linda proton-beam treatment facility.Synchrotrons are also generally used to produce heavier particles (e.g.,12C ions used for radiation treatmentlead suits for radiation).
All types of proton facilities,owing to the high "magnetic- rigidity" of high energy protons,require a set of large (and costly) beam-switching magnets and patient-treatment gantries.Likewise,raster-scanning the beam and varying the dose-depth required to treat a particular tumor is not trivial,which can be done with electronic elements (active scanning) or with shaped absorbers (passive modulation).

Customer's Reviews:
Write Your Review:
Tell us what you think about this item and share your opinions with other people. Please make sure your review focuses only on this item. All reviews are moderated and will be reviewed within two business days. Inappropriate reviews will not be posted. After-sales questions and issues: Contact our Customer Service Department. (A customer representative will get back to you).

Connect Alwaysx

Connect us in Whatsapp or Facebook Messenger

Messenger

whatsapp