IGRT 2024 EXAM QUIZZES WITH COMPLETE ANSWERS!!

IGRT 2024 EXAM
QUIZZES WITH
COMPLETE
ANSWERS!!
Evatee 9/5/24 IGRT

, IGRT 2024 EXAM QUIZZES WITH COMPLETE
ANSWERS!!


Why is IGRT used in radiotherapy? Answer - - highly conformal dose
distribution with IMRT and VMAT/RapidArc. Therefore, the risk of
undertreating PTV or overtreating OARs
- treatment margins reduced to allow dose escalation and the reduction in
toxicity
- daily anatomical changes (bladder, prostate, lungs
- Weight gain and loss
- allow for an increase in dose prescription to tumour, decrease morbidity,
increase probability of tumour control and decrease treatment volumes


What is IGRT? Answer - Image-guided radiotherapy: IGRT is radiotherapy
based on data pertaining to the relationship between beam and patient
geometry acquired at the point of treatment delivery with the intent to ensure
geometric accuracy of radiation delivery appropriate to the clincial scenario


What are the sources of geometric uncertainty? Answer - - random and
systematic errors
- organ motion
- delineation/target definition
- microscopic disease
- anatomy changes
- setup errors


List out the various modalities of IGRT Answer - - EPI - MV imaging