FINAL EXAM NATIONAL BOARD OF EXAMINATIONS
APRIL 2016
POSSESSION USE OF CELL PHONES OR ANY SUCH ELECTRONIC GADGETS IS NOT PERMITTED INSIDE THE
EXAMINATION HALL.
RADIOTHERAPY
PAPER IV
RTH/APRIL/16/41/IV
Time 3 hours
Max. Marks 100
Important instructions:
• Attempt all questions in order.
• Each question carries 10 marks.
• Read the question carefully and answer to the point neatly and legibly.
• Do not leave any blank pages between two answers.
• Indicate the question number correctly for the answer in the margin space.
• Answer all the parts of a single question together.
• Start the answer to a question on a fresh page or leave adequate space between two answers.
• Draw table/diagrams/flowcharts wherever appropriate.
Write short notes on:
1. Principle and application of PET scan in Oncology.
Its current status based on evidence in literature for radiation
treatment planning of lung cancer.

2. Process of treatment planning with electrons.
Enumerate the sites where it is regularly used, if available.
6+4
3. Enumerate the various acceptance tests done before
commissioning a linear accelerator for patient treatment.
Limits and tests for determining beam flatness and beam
symmetry.
5+5
4. Define GTV, CTV, ITV PTV.
Enumerate the salient features of ICRU 50 and 62.
4+6
5. What is Stereotactic Body Radiotherapy
Enumerate the sites in which SBRT has a role and why?
3+7
6. What is dose volume histogram
How is it computed?
What are its pitfalls?
Give one example of how you would interpret/utilize DVH.

7. What is gating in radiotherapy?
Where is it used and how?
3+7
8. What is Adaptive Radiotherapy?
In which sites has it been used?
What are its problems and limitations?

9. What is the radiobiological basis of hypofractionated RT
Enumerate the sites in which HFRT is being used along with its
evidence.
4+6
10. Enumerate the emergencies in oncology.
Indications, dose schedules technique and results of radiation
therapy for spinal cord compression treatment in malignancy.