imrt
Terms
undefined, object
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- gantry does not move during irradiation
- segemental IMRT and dynamic IMRT
- gantry moves during irradiation
- tomo or arc
- difference between static/segmental IMRT and dynamic
- move't mlcs during irradiation
- another term for segemntal IMRT
- step/stop and shoot
- define sliding window
- another term dynamic imrt
- describe MiMiC
- slit coll added to linac, defines fan beam 20 cm W x 1-4 cm L
- define Crane
- couch indexing device
- describe imat
- arc therapy where coll and gantry move to deliver mu. one arc produced each intensity level
- typical dose cont from mlcs
- 4%
- why heterogeneity corr more important
- more beam directions/localized dose diff and escalated doses
- user specifications inverse planning
- beam direction/arc angles, target dose goals and constraints
- how objectives for dose specified
- single dose value, dose volume points, flexible dvhs
- stochastic method planning
- randomly changing beam intensities to escape local minima
- concave shapes and steep dose gradients near OAR results in...
- dose inhomogeneity
- "balancing"
- casting shadow on some beamlets to balance w higher intensity others
- define segment
- shape of aperture as defined by MLC
- examples of biological imaging
- PET/MSRI
- which algorithm is example of biological based objective function?
- fwd planning
- fan beam IMRT is also called...
- tomo
- define beam hold
- when dose rate too high for mlcs to reach positions, beam is turned off temp
- how compensate for beam penumbra.
- fluence intensity target edges enhanced
- which ICRU report describes definition PTV?
- #62
- margins HN
- 3 mm
- margins gyno/prostate
- 0.5 cm
- define SIB
- sim integrated boost, diff dose/fx each PTV
- as conformity increases, homogeneity
- decreases
- icru report which states deliniation gtv should be ct based
- #50
- how does integral dose change with increasing energy?
- decreases