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Treatment Planning in Radiotherapy – MCQs with Answers (Volume One) – Comprehensive Practice Question Set for Radiotherapy Students and Clinicians

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This document contains 50 multiple-choice questions with answers covering essential concepts in radiotherapy treatment planning. Topics include target volumes, imaging, dose prescription, fractionation, treatment techniques, dose calculation algorithms, physics principles, IGRT, and quality assurance. It is a complete practice set designed to support exam preparation and clinical understanding.

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TREATMENT PLANNING IN
RADIOTHERAPY — 50 MCQs WITH
ANSWERS
VOLUME ONE

, MCQs 1–10: Target Volumes & Imaging
1. The GTV represents:
A. Microscopic tumour spread
B. Visible tumour only
C. Irradiated tissue
D. Treatment margin
Answer: B

2. The CTV includes:
A. Only gross tumour
B. Setup error
C. Microscopic disease extension
D. Normal structures
Answer: C

3. The PTV margin compensates for:
A. Tumour biology
B. Setup errors and patient motion
C. Dose uncertainties only
D. Organ tolerance
Answer: B

4. The best imaging modality for soft-tissue definition is:
A. CT
B. MRI
C. CBCT
D. PET
Answer: B

5. PET-CT is most useful for:
A. Dose calculation accuracy
B. Soft tissue contrast
C. Metabolic tumour activity
D. Motion tracking
Answer: C

6. CT slice thickness for planning should ideally be:
A. 10 mm
B. 1–3 mm
C. 5–10 mm
D. 0.1 mm
Answer: B

7. ITV is primarily used for:
A. CNS tumours
B. Prostate cases
C. Mobile organs (lung/liver)

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