IMRT

Question 1

what does IMRT do

Answer 1

allows us to bend dose distribution

improve the shape of distribution to target volume and OARs

Question 2

Why use IMRT?

Answer 2

• improve conformity w target dose
• reduce irradiation of normal tissues
• treat concave structures to a high dose

Question 3

Rationale for IMRT

Answer 3

↑Tumour control probability(TCP) while maintaining the same or ↓normal tissue Complication Probability(NTCP)

allows a more efficient way of delivering complicated plans , therefore ↓treatment times

Question 4

IMRT should be considered if:

Answer 4

• target is irregular and close to OARs
• when the only option available is to cover target and protect nearby structures
• convace target where an conformal dose distribution is required