1. Hot and cold spots are common problems associated with planning:
A. Isocentric Fields
B. Four Field Technique
C. Three Field Technique
D. Abutting Fields

2. D.

3. Central axis depth dose distribution depends on energy
Central axis depth dose distribution depends on energy. Which of the following is true?
Depth of a given isodose curve increases with beam energy
Absorbed dose outside primary beam is greater for higher energies
An advantage of orthovoltage is increased energy of scatter radiation
A B C D. 1,2,3

4. A.

5. Why does exposure rate increase as field size increases?
Filter flattening
Block transmission
Collimator scatter
Phantom scatter

6. C.

7. The depth of maximum ionization is most dependent on:
SSD
Field Size
Beam Energy
Thickness of tissue

8. C.

9. All of the following are general properties of x and gamma ray dose distribution EXCEPT:
Near beam edge dose rate decreases rapidly
Near beam edge fall off is due to geometric penumbra and side scatter
Dose at any depth decreases toward edges
Dose at any depth is lowest on central axis

10. D.

11. When verifying an isodose chart using a water phantom, the acceptable amount of deviation is considered to be ___ or less in depth up to 20cm 2% 4% 7%
10%

12. A.

13. Because of its relatively flat energy response and higher precision, the most reliabel isodose charts are measured by a/an
TLD
Ion Chamber
Radiographic Film
Laser Beam

14. B.

15. A 3-D compensator was constructed for a patient
A 3-D compensator was constructed for a patient. The Oncologist added 3cm to the width. What do you do?
Hand block and treat
Construct a new compensator
Move the compensator 3cm and treat
Do not change anything and continue treatment

16. B.

17. Which of the following will not effect the isodose curve?
Bolus
Lucite Tray
Compensator

18. B.

19. The angle between the central axes of two beams is called the:
Hinge angle
Wedge angle
Seperation angle
Plateau angle

20. A.

21. The wedge used during external beam irradiation of the larynx is used to:
Evenly distribute dose
Increase distributed dose
Reduce skin dose
Reduce backscattering

22. A.

23. What is the hinge angle for a 30 degree wedge?60
100
120
150

24. C.

25. An area outside the target area which receive a higher dose than the specified target dose is called a
Tolerance spot
Cold spot
Hot spot
Threshold spot

26. Two treatment fields on a patient have a hinge angle of 90 degrees
Two treatment fields on a patient have a hinge angle of 90 degrees. What is the wedge angle 15 60 45 30

27. C.

28. The ______of a beam refers to the sameness from side to side of the profile
Flatness
Symmetry
Dosimetry
Bolus

29. B.

30. _______ is the measurement of radiation dose
Dosimetry
Physics
Dose
Prescription

31. A.

32. The use of half beam technique has the advantage of:
Avoiding areas of increased dose
Increasing number of hot spots
Preventing beam divergences
Decreasing number of cold spots

33. C.

34. A _____ isodose curve will have an hour glass shape of the highest intensity isodose line
POP
4 Field Box
3 Field
4 Field Diamond

35. A.

36. A_____ is the use of independent variable jaws moving during the treatment.
Wedge pair
Universal wedge
Dynamic wedge
Hinge angle

37. C.

38. Stereotactic is a type of:
Non-coplanar beam
Co-planar beam
Wedged beam
Vertex field

39. A.

40. Which method decreases dose at sides of patients?
POP
4 Field Box
4 Field Diamond
3 Field
None

41. C.

42. A ________ uses more than 4 fields with extensive blocking
Dynamic Field
Conformal Field
POP
None of these

43. B.

44. The area of the isodose curve close to dmax that appears uneven is the ?

45. Horns

46. Adjustments to the dose distributions can be accomplished by assigning different _____ to the beams

47. Weighting

48. Beam symmetry must be within ____ from side to side over _____ of the beam at _____cm depth
3%, 75%, 100
2%, 80%, 10
5%, 80%, 5
10%, 80, 10

49. B.

50. The process of converting dose distribution to percent of a dose at some point is called:
Field Weighting
Normalization
Bolus
None of these

51. B.

52. The depth of maximum ionization if most dependent on A. SSD B
The depth of maximum ionization if most dependent on A. SSD B. Dose per fraction C. X-Ray energy D. Total Dose

53. C.

54. The treatment prescription should define the:
Treatment volume
Tumor Dose
Number of treatments
1, 2
2, 3
3, 1
1, 2 and 3

55. D.

56. Mayneord f-factor is of use when there is a change in _____
A. PDD
B. SSD
C. Energy
D. TA

57. A.

58. This is an example of a/an:

59. Isodose Curve

60. Name the beam energy A B C

61. Co-60
6MV
18MV