X Ray Radiotherapy

Question 1

What doses tend to be used for radiotherapy?

Answer 1

1 to 25MeV

Question 2

What is the process of tumour irradiation?

Answer 2

A high energy x-ray beam is directed towards the tumour. The beam is rotated to unsure the tumour is at the centre of rotation and receives the maximum dose while the surrounding healthy tissue doesn’t.

Question 3

What is the issue with irradiation therapy?

Answer 3

It can cause secondary tumours

Question 4

Absorbed dose (D) =

Answer 4

total energy of radiation absorbed/mass

Question 5

What is the unit of absorbed dose?

Answer 5

Gray/Gy

Question 6

What is equivalent dose (H)?

Answer 6

DxWr where Wr is the radiation weighting factor

Question 7

What is radiation weighting factor?

Answer 7

How dangerous the radiation type is

Question 8

What is the effective dose (E)?

Answer 8

HxWt or DxWrxWt where Wt is the weighted tissue factor

Question 9

What is the weighted tissue factor?

Answer 9

How much radiation a body part absorbs