Quality Assurance information for Radiation Therapy
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| show | 50 to 100 kV
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| 2. What machines had "hot cathode" tubes and generated medium energy ranges? | show 🗑
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| 3. What is the energy range for orthovoltage machines? | show 🗑
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| show | drive stand, gantry, patient support assembly (PSA), electronic cabinet, and console
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| show | Klystron or magnetron, waveguide, circulator, and water cooling system
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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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| show | electron gun, accelerator guide, treatment head
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| show | bending magnet, x-ray target, flattening filter, scattering foil, monitor chambers, optical distance indicator, primary and secondary collimators
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| show | scattering foil
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| show | klystron
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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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| 15. Gantry, x-ray head and collimator, x-ray tube and generator, imaging device, and couch are all components of what simulator? | show 🗑
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| show | field-defining wires
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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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| 19. True or False: A conventional simulator could potentially produce CT images. | show 🗑
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| show | slice by slice and volumetric (spiral) CT
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| show | The diameter of the hole into which the patient is positioned
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| 22. Each small square on a CT image is called what? | show 🗑
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| 23. Window selection determines what in CT simulation? | show 🗑
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| 24. What are the two window selections that can be made? | show 🗑
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| 25. _______________ represents the range of grey scale on a CT image? | show 🗑
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| show | It represents the center of the window width
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| 27. A pixel is a two-dimensional representation of what? | show 🗑
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| 28. On a conventional simulator, localizing lasers and ODI checks should be performed when and within what tolerance? | show 🗑
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| 29. On a conventional simulator, rotation isocenter checks should be performed how often and be within what tolerance? | show 🗑
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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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| 35. What are the three major categories of a quality assurance procedure on treatment machine? | show 🗑
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| 36. The emergency off switches should be checked how often? | show 🗑
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| 37. The audiovisual monitor should be checked ___________ for _____________. | show 🗑
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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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| 41. For a linear accelerator the tolerance for variation in collimator rotation around the point of isocenter is: | show 🗑
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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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| show | the radiation output of therapy equipment
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| show | quality control check instrumentation
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| show | Upon receipt and at an agreed upon interval depending on the half-life
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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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| show | to provide a direct independent check of MU calculations
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| 55. Film dosimetry with sufficient spatial resolution for intensity-modulated patterns should be checked because ___________________. | show 🗑
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| 56. To ensure a constant dynamic MLC output and to track long-term stability what should be measured monthly? | show 🗑
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| show | Predesigned fields using film image patterns
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| show | Accuracy of dose patterns and fluence
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| 59. True or False: Specific QA tests should not be performed on each field of a patient's IMRT plan. | show 🗑
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| 60. ____________ through MLCs contributes to increased patient exposure. | show 🗑
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| show | lack of penetrating ability, high skin dose, low output, large penumbra, doses not homogenous over treatment field, not isocentrically mounted
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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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| show | linear accelerator SAD is 100cm; Cobalt 60 SAD is 80 cm
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| 65. When using photons what is required to be present in the path of the beam to create a uniform dose distribution? | show 🗑
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| show | the target must be removed and a scattering foil must be added
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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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| show | the amount of material needed to reduce radiation transmission by 50%
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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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| show | 0.5 cm
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| 72. Approximately, what percentage of Cobalt 60 decays each month? | show 🗑
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| show | it is an adjustment made to treatment time to account for the time it takes to move the source in and out of position
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| 74. What are the leakage parameters of a Cobalt 60 machine in the OFF position? | show 🗑
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| show | must not exceed 0.1% of the useful beam at 1 meter
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| 76. What is the "useful beam" referring to in regards to a Cobalt 60 unit? | show 🗑
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| 77. What is geometric penumbra? | show 🗑
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| show | SSD-direct, Source size- direct, SDD-indirect
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| show | a) It occurs when straight edge blocks are used for shielding because they do not follow the beam path. Custom blocks do diverge with the beam.
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| show | at least 15 cm in order to avoid increased skin dose from scatter
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Created by:
cj2218
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