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Quality Assurance information for Radiation Therapy

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Question
Answer
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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