gamma knife Flashcards

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1
Q

stereotactic

A

the 3D localisation of a point in space by a unique set of coordinates that relate to a fixed external reference frame

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2
Q

what is stereotactic radiosurgery

A

​- DOES NOT involve any surgical procedure.​

  • Narrow beams of radiation precisely focused on a small target.​
  • Tends to be single fraction but can have up to 5#’s.​
  • Normally delivered usingGammaknife™orCyberknife™.​
  • Can be delivered using a linear accelerator.​
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3
Q

aims of SRS

A
  • Highly conformal radiotherapy - used to achieve an extremely high concentration of absorbed dose to a small spherical target.
  • Can only be used for limited tumour volume size < 3.5cm diameter.
  • Extremely rapid dose fall-off to normal surrounding tissue = high therapeutic ratio.
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4
Q

advantages of SRS

A
  • Reduced toxicity to normal tissue.
  • More precise treatment.
  • Reduction in acute side effects.
  • Fewer appointments required.
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5
Q

what is gamma knife

A
  • Array of Cobalt 60 sources (varies from 201 – 192)
  • Aligned using a collimation system
  • sources are focused on the target area and sources can be turned on or off to achieve the best dose to the target.
  • Sources are evenly distributed over the surface of the hemispherical source core.
  • Each beam is directed at a common focal spot at the centre.
  • Enables high doses to be delivered to the abnormal tissues whilst sparing the adjacent healthy tissue.
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