3D planning beam arrangements
dose constraints
MU calcs
physics for planning
Misc
100
The typical beam arrangement for a whole brain plan
What is opposed laterals?
100
cord
what is 45 Gy?
100
What dose would you deliver to a point at 10cm deep in a water phantom if you delivered a 10x10 field, 6MV, 100cm SSD?
~67cGy
100
The rule of thumb for how quickly electrons lose energy with depth (in MeV/cm).
2MeV/cm
200
Where are the hot spots in a 4 field box plan and how hot would you expect them o be
4 corners
5-15%
200
Lens
what is 7-9Gy
200
What is the formula for an equivalent square field size for a rectangular field?
4 x A/P
300
How would you calculate the gap size between the two spine field for a CSI case
r
300
Lung V20 in a lung plan
What is V20 <30%
300
How is wedge angle defined
300
how would you calculate the hinge angle for a wedge pair?
WA = 90 - (HA/2)
or
HA = 2(90-WA)
400
Describe a multi-iso breast beam arrangement
-scv
-pab
-couch kicks on the tangents to match
400
Mean heart dose in a breast plan
what is 1-2-3Gy for a right sides, or 2-4Gy for a left
500
old-school head and neck plan number of beams
7
500
What is the mean dose constraint for the parotid gland(s)? What is the expected sequelae for exceeding this dose constraint?
bilateral mean 25Gy
Unilateral 20Gy
xerostomia