FEBRUARY 2017 Sub. Code: 1908
B.Sc. RADIOTHERAPY TECHNOLOGY
FIRST YEAR
PAPER III RADIOTHERAPY PHYSICS AND PRINCIPLES OF
RADIOTHERAPY
Q.P. Code: 801908
Time: Three Hours Maximum: 100 Marks
Answer all questions
I. Elaborate on: x 10 30)
1. Mention the types of interaction of radiation with matter and describe any
two major interactions in detail.
2. What are the disadvantages of conventional radiotherapy? Describe briefly
the some of the modern techniques and their advantages.
3. List the different types of telecobalt shutter systems. Write a detailed note
about the working of a telecobalt unit with a neat diagram.
II. Write notes on: x 5 40)
1. Styrofoam cutter and its applications.
2. List any three radioactive sources used in radiotherapy and mention their
properties and applications.
3. Patient immobilization devices.
4. Stereotactic radiosurgery and stereotactic radiotherapy? List the differences
between them.
5. What is wedge filter? Explain the types of wedge filters in radiotherapy.
6. Explain SSD and SAD techniques and list their merits and demerits.
7. Intensity modulated radiotherapy.
8. Metabolism and the excretion of the drugs used in the management of cancer.
III. Short answers on: (10 x 3 30)
1. What are shielding blocks used for? Give one disadvantage.
2. What is the role of bolus in radiotherapy?
3. List the different types of patient immobilization devices.
4. What are Isodose curves?
5. What is the major advantage of proton therapy over photon-based radiotherapy?
6. Define half-value layer.
7. What is the advantage of Tomotherapy over conventional radiotherapy?
8. What is skin sparing effect?
9. What is the type of target used in a linear accelerator?
10. What is the purpose of cytotoxic drugs?