Stereotactic radiosurgery (srs)

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Stereotactic radiosurgery (srs)

  1. 1. StereotacticRadiosurgery (SRS) Amin Jahanbakhshi
  2. 2.  Three of the latest radiosurgery treatments:1. are CyberKnife2. Gamma Knife3. Stereotactic Linear Accelerator
  3. 3.  In fact radiosurgery is stereotactic only if the distribution of radiation beams is in three dimensions and not in two as in traditional radiotherapy
  4. 4.  Radiosurgery is a relatively recent technique (starting in 1951 with Gammaknife by Leksell in Stockholm) The unit of Leksell was a kind of big helmet usable only for the cranium that was firmly fixed to the helmet.Gammaknife
  5. 5.  A linear particle accelerator (often shortened to linac) is a type of particle accelerator that greatly increases the velocity of charged subatomic particles or ions by subjecting the charged particles to a series of oscillating electric potentials along a linear beamlineLinear Accelerator (Linac)
  6. 6.  In 1982 the use of a linear accelerator of high precision combined with a Leksells device fastened to the couch sustaining the patient and the precise capability of the couch to rotate around a vertical axis made possible to obtain three-dimensional treatments similar to those obtained with Gammaknife.Linear Accelerator (Linac)
  7. 7.  Recent innovations in radiosurgery (Cyberknife 1994) include platforms that sense the position of the patient and adjust the radiation to patient position, to avoid the effects of the movements of patient and the breathing motion, in order to keep the necessary precision to also irradiate a very small target. In such manner the method can be applied also to extracranial lesions, extending enormously the treatment possibilities.The Cyberknife
  8. 8.  The two main elements of the CyberKnife are: (1) the radiation produced from a small linear particle accelerator (2) a robotic arm which allows the energy to be directed at any part of the body from any directionThe Cyberknife
  9. 9.  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

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