Lab Report 24 -...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Lab Report 24:  Gamma Knife Daily and Monthly Mechanical  Checks Jared Meharg PHYS 6993 Instructor:  Dr. Podder 4/14/2011
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
I. Introduction Stereotactic radiosurgery combines the use of a stereotactic apparatus and high energy  radiation beams to irradiate a target volume with a single treatment (up to 30 Gy in 1  treatment).  Gamma knife is a type of stereotactic radiosurgery (SRS) that uses an  arrangement of multiple cobalt-60 sources to simultaneously deliver a large number of  isocentric gamma ray beams to a target lesion in the brain.  The sources are contained  within a hemispherical shield and the radiation beams are collimated to focus on a  single central point within the hemisphere.  The unit has a shielded door for patient  entrance, along with a hydraulically controlled treatment table. Initial collimation of the treatment beams is accomplished by machined channels in the  source housing. Four interchangeable helmets align with the housing channels and  encompass the patient ‘s head for further collimation of the treatment beams.  The  helmets are classified by the channel diameter that produces circular field openings of  4, 8, 14, or 18 mm at the focus point.  Channels can be blocked to optimize the dose  distribution for some treatment plans.   The advantage of SRS is that it delivers high doses to very small tissue volumes, which  ideally minimizes collateral damage to normal adjacent tissue.  Due to the nature of the 
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/21/2012 for the course PHYS 6720 taught by Professor Hu during the Spring '10 term at East Carolina University .

Page1 / 4

Lab Report 24 -...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online