Chapter 15 PP Flashcards
intrafraction
changes or motion during the treatment administration such as breathing
interfraction
changes occurring between treamtnet sessions such as bladder or rectum being less full from one treatment to the next
DIBH
deep inspiration breath hold
when is DIBH mostly used
when treating the left breast to decrease dose to the heart
Radiation is turned on when the target is within the treatment volume and is turned off when the target is outside the target volume
respiratory gating
when is respiratory gating commonly used
treatment of cancers of the lung, esophagus, tumors in abdomen, and breast
Use of some type of compression device to induce shallow breathing for managing internal motion due to respiration.
abdominal compression
Scans at a low number of revolutions per second so that multiple respiration phases are recorded on the same axial image
slow CT scanning
contains as many as several hundred individual cobalt-60 sources focused on a single point.
gamma knife
robotic machine used to treat with SRS
cyberknife
SRS
stereotactic radiosurgery
define SRS
focusees high power energy on a small area of the body, minimizing dose to normal tissue
SRS is used for what type of treatment
brain treatment
SRT
stereotactic radiation therapy (used interchangably with SRS)
SBRT
stereotactic body radiation therapy
SBRT is used for treating what
lung, esophagus, tumors with motion during treatment
SBRT: list two types of immobilization devices
vaccum sytems and abdominal compression device (both induce shallow breathing)
explain difference between photons and protons
Photons are high energy x-rays whereas Protons are heavy charged particles
what is the biggest difference between treating with photons and protons?
proton treatment does not have an exit dose
photons pass throuh the tumor and exit out the other side hitting normal tissue along the way
which type of treatment has less side effects? (proton/photon)
proton
Protons have what is called a _____ Peak
bragg
. It is the sharp increase in the dose distribution curve of a charged particle, at a particular depth. So small amounts are deposited initially, with the majority being deposited at the tumor (near end of their range) where the dose peaks to a high value then drops rapidly to zero.
bragg peak
which is more expensive? (photon/proton)
proton
