Radiotherapy process and current techniques

Question 1

What is forward planning?

Answer 1

o Forward planned requires planner to place and shape beams of radiation to treat tumour and limit does to other tissues
 Less used
 Only really used in palliative

Question 2

What is inverse planning?

Answer 2

o Inverse planned requires planner to manipulate dose objectives on tumour and other structures to achieve an acceptable plan
 IMRT
 No uniform intensity across beam allowing concave distributions, steep dose gradients
 Uses 1000s of beams
 Uses dose volume histogram
 Can get dose dumping

Question 3

When is TBI used?

Answer 3

leukaemia, lymphoma, BM transplant

Question 4

What is the regimen for TBI?

Answer 4

12Gy/6#