Wk11 Special Treatment Techniques Flashcards
1
Q
What are the difference of SRS and SRT?
A
Both SRS and SRT us stereotactic apparatus and radiation to treat intracranial lesions.
But SRS only a single treatment
SRT use multiple fractions
2
Q
What are the differences in clinical outcome for SRS and WBRT?
A
- SRS and WBRT have similar local control
- WBRT provide better control on distant intracranial recurrence
- SRS has better neurocognitive outcome
- SRS and WBRT has little impact on total survival rate
3
Q
What are the equipment for SRS beam data measurement?
A
- micro ionisation chamber
- stereotactic diode or electron diode
- edge diode
- film
- diamond dosimeter
- liquid ion chamber
4
Q
What test is used to verify isocenter in SRS?
A
Winston-Lutz test (Ball shot test)
5
Q
What is the use of a CT localiser?
A
- links Angio images to CT
- create stereotactic coordinate system
6
Q
What are the common prescriptions of Lung SBRT?
A
6Gy x 3 = 18Gy
10Gy x 5 = 50Gy
7
Q
What immobilisation device is used in SBRT?
A
BodyFix, alpha cradle, Prolok system
8
Q
What is 4DCT?
A
- acquire all respiratory phases at each slice location
- simultaneous recording of breathing signal
- retrospectively sort images based on phase / amplitude
- acquired images 10 times more of a regular scan
- imaging dose is 6-10 times more of a regular scan
9
Q
What is MIP use for plan computation?
A
Target volume delineation
10
Q
What is AVG used for in plan computation?
A
Dose calculation
