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QA & Equipment
Quality Assurance and Equipment in Radiation Therapy
| Question | Answer |
|---|---|
| Which component in a linear accelerator is the source of microwave power? | Klystron |
| What is the purpose of a beam flattening filter? | Absorbs more photons from the central axis |
| True or False? The scattering foil is used in photon beams. | False. It is used with electrons |
| What are the 4 major components in the drive stand? | Klystron, waveguide, circulator, & cooling system |
| What is the half-life for Co-60? | 5.26 years |
| How often does a Co-60 source need to be replaced? | At least every 5.3 years |
| How often does the output for a Co-60 source need to be checked? | Every month |
| What is the Dmax for 10MV? | 2.5cm |
| What is the Dmax for 6MV? | 1.5cm |
| What does cerrobend consist of? | Bismuth, Lead, Tin, & Cadmium |
| True or False? There is a different scattering foil for every electron energy. | True |
| All planned or systematic actions necessary to provide adequate confidence that a product or service will satisfy given requirements for quality is known as… | Quality Assurance |
| On a conventional simulator, how often are the lasers checked? | Daily |
| Who is the main person in charge of performing the quality control procedures? | Radiation Therapist |
| Who is responsible for establishing and managing quality control procedures and tolerances? | Physicist |
| What is the tolerance of the lasers on a conventional simulator? | +/-2mm |
| How often is the emergency/collision avoidance checked on a conventional simulator? | Monthly |
| How often is the alignment of gantry lasers with the center of the imaging plane on a CT simulator checked? | Daily |
| What is the tolerance of the gantry laser alignment in a CT simulator? | +/-2mm |
| How often is the gantry tilt accuracy checked on a CT simulator? | Annually |
| What 2 types of bending magnets are there for linear accelerators? | 90 and 270 degrees |
| What is the purpose of the ion monitor chamber in a linear accelerator? | Monitor dose rate and field symmetry |
| Every month a correction in the output due to decay has to be accounted for in treatment time calculations for Co-60 machines of about how much? | About 1.09% |
| Which agency requires quality assurance log books be accurately kept for review? | Nuclear Regulatory Commission (NRC) |
| What is the SAD for a Co-60 machine? | 80cm |
| What is the SAD for a linear accelerator? | 100cm |
| What is the Dmax for Co-60? | 0.5cm |
| T or F? Radioactive sources used in brachytherapy are available sealed and unsealed? | True |
| Sealed sources for brachytherapy come in what forms? | Pellets, Seeds, Capsules, Needles, Buttons, or Metal Rods |
| How often should radiation detectors for brachytherapy be calibrated? | Monthly or after each repair |
| All brachytherapy sources in inventory should be tested for leakage how often? | Semi-annually at a minimum |
| CT simulators can acquire anatomic data using which scanning methods? | Axial or Helical Scanning |
| A tomotherapy machine has a similar gantry design as to what other machine? | CT Scanner |
| T or F? During tomotherapy treatment 3D images are acquired to verify accurate focus on the target volume? | True |
| If a brachytherapy patient is remaining in the hospital, adjoining rooms must not exceed how much radiation? | 0.2mSv/hr |
| Why should treatment accessories be checked regularly? | Ensure physical integrity and reliability |
| The CT number accuracy of water is checked how often? | Daily |
| How often is the image noise evaluated for CT simulators? | Daily |
| How often are emergency off switches checked on Co-60 Units and linear accelerators? | Monthly |
| Which group sets standards to ensure safe and healthful working conditions for working men and women? | Occupational Safety and Health Administration (OSHA) |
| If any medical device causes death or injury of a patient or employee, which agency must the incident be reported to? | Food & Drug Administration |
| What is the average energy of Radium-226? | 0.830 MeV |
| What is the average energy of Cobalt-60? | 1.253 MeV |
| What is the average energy of Cesium-137? | 0.662 MeV |
| What is the average energy of Iridium-192? | 0.380 MeV |
| What is the average energy of Iodine-125? | 0.028 MeV |
| What is the average energy of Palladium-103? | 0.021MeV |
| What is the average energy of Gold-198? | 0.412 MeV |
| What is the half-life of Radium-226? | 1622 years |
| What is the half-life of Cesium-137? | 30 years |
| What is the half-life of Iridium-192? | 73.83 days |
| What is the half-life of Iodine-125? | 59.4 days |
| What is the half-life of Palladium-103? | 16.99 days |
| What is the half-life of Gold-198? | 2.7 days |
| What is the half-life of Radon-222? | 3.82 days |
Created by:
kalong
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