Medical Radiation Physics as applied Radio Therapy PG DMRT Question Bank : web.tnmgrmu.ac.in

Name of the University : The Tamilnadu Dr. M.G.R. Medical University
Degree : PG Diploma in Medical Radio Therapy (DMRT)
Subject Code/Name : 3025 Medical Radiation Physics as applied Radio Therapy
Paper : I
Document Type : Question Bank
Website : web.tnmgrmu.ac.in

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Medical Radiation Physics as applied Radio Therapy :
September 2008 :
I. Essay questions : (2 X 20 = 40)
1. Write about permanent interstitial implants, its principle and applications.
2. Discuss about intra cavitary radiotherapy principles, its applications.

II. Write short notes on : (10 X 6 = 60)
1. Hyper fractionation.
2. Negative II mesons (Pimesons).
3. Production of Neutron beam.
4. Conformal therapy.
5. Half life.
6. Gama Knife.
7. Bolus.
8. Thermoluminesoence docimeter.
9. Tissue-Air-Ratio. (T.A.R.).
10. Ionization.

March -2009 :
I. Essay questions : (2 X 20 = 40)
1. What is a Linear Accelerator- Draw a block diagram and discuss the parts of
a typical medical linear accelerator. Discuss the clinical advantages of a Linear accelerator over a telecobalt machine.
2. What is the basis of fractionation- What is conventional fractionation- Write briefly on altered fraction and its clinical advantages. Explain linear quadratic model infractionation.

II. Write short notes on : (10 X 6 = 60)
1. Commissioning tests for a Telecobalt machine.
2. Isotopes used for various intraluminal brachytherapy and intravascular branchytherapy.
3. Pair production.
4. Define the following a) Half life b) Radioactivity c) Half value layer d) Tissue Air Ratio.
5. Beam modifying devices.
6. Gamma knife and cyber knife.
7. Chemical dosimetry.
8. List six distinct radiation protection features to be found in or around a 6 MV linear accelerator suite.
9. Absorption of low LET X ray photons by tissue generates fast electrons which in turn cause cell damage via two district mechanisms. Describe these two mechanisms with the aid of a diagram indicating the duration of molecular events involved.
10. Strontium 90.

September – 2009 :
I. Essay questions : (2 X 20 = 40)
1. Discuss interaction of radiation with matter.
2. Write about linear accelerator’s physical principle and applications.

II. Write short notes on : (10 X 6 = 60)
1. Ionization chamber.
2. Linear energy transfer.
3. Alpha rays.
4. Wedges.
5. Low dose brachy.
6. Stochastic effects of radiation.
7. Galium 67.
8. Multi leaf collimeters.
9. Mantle field calculation.
10. Proton therapy principle.

September 2010 :
I. Essay questions : (2 X 20 = 40)
1. Discuss the various modes of interaction of radiation with matter and their relevance as applicable to radiotherapy.
2. Describe the particle radiations of clinical use in radiotherapy and their relative merits and demerits.

II. Write short notes on : (10 X 6 = 60)
1. Radiotherapy stimulators.
2. Remote after loading.
3. Rectal dosimetry.
4. Beam modifying devices.
5. Tomotherapy.
6. Iodine 125.
7. Compton Effect.
8. Heavy particle radiotherapy.
9. Permanent Implants.
10. Production of Neutron beam.