Quality Assurance information for Radiation Therapy
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1. What is the energy range for superficial (Crookes tube) therapy machines? | show 🗑
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show | Orthovoltage or deep therapy machines
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3. What is the energy range for orthovoltage machines? | show 🗑
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4. What are the five main components of a typical linear accelerator? | show 🗑
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5. What are the 4 major components of the drive stand? | show 🗑
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show | it is an amplifier of microwaves that are produced by a radio-frequency drive ; used for 10MV and above
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show | it is a source of microwaves; used for 6MV and below
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show | a series of tubes/pipes that transport microwaves to the accelerator guide
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9. What are major components of the gantry? | show 🗑
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10. What are the components of the treatment head? | show 🗑
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show | scattering foil
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12. In a linear accelerator, microwave amplification occurs in the: | show 🗑
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13. On a conventional simulator what can be used to reduce unwanted scatter radiation? | show 🗑
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show | It was meant to simulate the mechanical, geometric, and optical conditions of a variety of treatment units
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show | Conventional or fluoroscopic-based simulator
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16. On a conventional simulator, what defines the edge of the treatment field? | show 🗑
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show | collimation by displaying a 1 to 2 cm clear border of unexposed film
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18. A typical image intensifier contains what four major components? | show 🗑
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show | True if the machine has a CT mode.
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show | slice by slice and volumetric (spiral) CT
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21. In CT simulation, what does aperture size refer to? | show 🗑
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show | pixel
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23. Window selection determines what in CT simulation? | show 🗑
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show | window level & window width
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show | Window width
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show | It represents the center of the window width
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show | a corresponding tissue volume or voxel
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show | daily and 2mm
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show | annually and 2mm
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show | annually
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show | monthly or after laser adjustments
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show | Table indexing and position, gantry tilt accuracy, gantry tilt position accuracy, scan localization, radiation profile width
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show | monthly and within 1mm over the range of table motion
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show | daily and be within the manufacturer's specifications
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show | Dosimetry, mechanical, and safety
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show | monthly
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show | daily for functionality
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38. X-ray output constancy and electron output constancy should be checked __________ and the tolerance is _________. | show 🗑
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show | a comparison of output and performances values as measured against what the manufacturer promised.
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40. Light field and radiation field congruence should be checked: | show 🗑
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show | 2mm
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42. The door interlock should be checked: | show 🗑
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43. Leak tests of sealed radioactive sources should be conducted at what interval? | show 🗑
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44. When performing a leakage test on a Cobalt 60 machine housing, what radioactivity level should NOT be exceeded? | show 🗑
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45. What should be checked weekly on a Cobalt 60 unit? | show 🗑
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46. Radiation detectors used with brachytherapy should be calibrated when? | show 🗑
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47. When ionization chambers are properly calibrated their accuracy approaches _________. | show 🗑
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48. Due to a properly calibrated ionization chamber's accuracy, it makes them suitable for measurement of ____________________. | show 🗑
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show | quality control check instrumentation
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50. In brachytherapy, source strength should be checked and verified when? | show 🗑
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51. What is the tolerance for the daily check of linac output constancy? | show 🗑
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52. How often should field size indicators be checked? | show 🗑
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show | AAPM
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54. For dynamic MLC QA, why should ion chamber measurements be taken in a solid phantom for patient fields? | show 🗑
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show | It is a good way to compare the delivered dose distributions to the planned ones
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show | Ion chamber and diode array measurements should be taken at different gantry and collimator angles.
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57. To provide a visual assessment of dynamic MLC function what should be checked biweekly? | show 🗑
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58. A periodic dosimetric verification of intensity-modulated fields is performed for dynamic MLC QA to ensure ______________________. | show 🗑
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show | False- tests SHOULD be completed on each field to ensure accuracy
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show | Leakage
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61. What are 6 disadvantages of an orthovoltage unit? | show 🗑
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show | D max is the depth at which electronic equilibrium is reached
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63. Is the relationship between D max and energy direct or indirect? | show 🗑
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64. What is the SAD of a linear accelerator and Cobalt 60 unit? | show 🗑
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show | flattening filter
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66. When electrons are produced what must be removed out of the path of the beam, and what must be added to spread the beam? | show 🗑
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show | 1.25 MV; it is comprised of two gamma rays with energies of 1.17 MV & 1.33MV
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68. What is a half-value layer (HVL)? | show 🗑
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69. What is the HVL of Co-60? | show 🗑
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show | 4.8 cm of lead
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71. What is the D max for a Cobalt 60 unit? | show 🗑
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show | 1.1% each month
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73. When discussing Cobalt 60 units what is timer error? | show 🗑
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74. What are the leakage parameters of a Cobalt 60 machine in the OFF position? | show 🗑
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75. What are the leakage parameters of a Cobalt 60 machine in the ON position? | show 🗑
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show | It refers to the output and is changed on a monthly basis to account for decay
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show | the area of unsharpness at the edge of the field
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show | SSD-direct, Source size- direct, SDD-indirect
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79. What is transmission penumbra? | show 🗑
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80. How far should Cobalt 60 trimmers or blocks be away from the patient? | show 🗑
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