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Seq. boost & SIB

Sequential boost

QuestionAnswer
Sequential boost - Involves high, intermediate and low dose PTV - Nodal areas can be high/low risk - PH1 dose constraints must NOT be met e.g. PH1: prostate and SV 56Gy in 28, PH2: prostate only 18Gy in 9 = 74Gy in 37 total
Triple phase sequential (prostate) PH1: pelvic LNs, prostate and SVs 46Gy in 23 PH2: prostate and SVs 10Gy in 5 PH3: prostate only 18Gy in 9 = 74Gy in 39 total
Disadvantages of sequential boost - Multiple plans - More QA requirements - More chances for error
2 phase gynae PH1: EBRT 50.4Gy in 28 PH2: brachy 16Gy in8
2 phase breast PH1: 50Gy in 25 PH2: 16Gy in 8
2 phase H&N PH1: 44Gy in 22 PH2: 16Gy in 8 = 60Gy in 30
SIB - Defines treatment delivering different doses per fraction to different target regions - Done via IMRT/VMAT
SIB prostate PTV54: 54Gy in 37 PTV74: 74Gy in 37
SIB H&N PTV70: 70Gy in 35 PTV63: 63Gy in 35 PTV56: 56Gy in 35
Benefits of SIB - Only one plan for the entire treatment course (QA workflow benefits) - Better target conformity - Less dose to critical structures - Moderate treatment acceleration - Reduced total treatment time - Option for dose escalation
Created by: chloe.donaldson
 

 



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