Radiotherapy & Toxicity

Question 1

True or false,
Hypoxic tissue is very radiosensitive.

Answer 1

False,
Hypoxic tissue is less radiosensitive (Hb+)

Question 2

True or false
Proton beams penetration very deep on the tissues

Answer 2

True

Question 3

True or false
Photon beams penetrate superficially in the tissues

Answer 3

False,
Penetrate deeply but less deep than protons beam

Question 4

Patient with skin cancer will undergo radiation therapy, what is the beam recommended for his case?

Answer 4

Electrons beam
As electron beams penetration is superficial and doesn’t go deep into the tissues which is sufficient for skin cancers

Question 5

Examples of directly Ionising beams in radiotherapy

Answer 5

electrons beams
, protons beams
alpha particles (helium nucleus),
beta particles (high energy electrons).

Question 6

Give examples of indirectly Ionising radiations in radiotherapy

Answer 6

Photon waves
Electromagnetic waves
Neutron waves

Question 7

Dose of radiation in radical radiotherapy

Answer 7

70 gray

Question 8

Dose of radiation in adjuvant radiotherapy

Answer 8

45-50 gray

Question 9

Dose of radiation in meoadjuvamts radiotherapy

Answer 9

45- 50 gray like adjuvant

Question 10

Dose of radiation in palliative radiotherapy

Answer 10

Hypofractionated
. Single dose 800cGray
.30 gray /10 fractions/ 2weeks