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Quality Assurance
Radiation Therapy Quality Assurance
| Question | Answer |
|---|---|
| What is acceptance testing? | A process by which output and performance values are measured and compared to expected values. (Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| What process follows acceptance testing? | Commissioning (Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| What is commissioning? | The documentation of output values to maintain consistent machine performance.(Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| Who are interlocks meant to protect? | Patient, personnel, and general public (Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| Interlocks are a part of what system? | Record and Verify (Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| What do ion chambers monitor? | Dose rate and field symmetry (Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| What apparatus defines electron fields and prevents scatter? | Cone (Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| The field size is the actual field measurement at the ________ | Isocenter (Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| Which particle has a "pencil beam" in its raw form? | Electron (Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| What component in the linear accelerator flattens out an electron pencil beam? | Scattering foil (Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| What element is commonly found in a scattering foil? | Lead (Pb) (Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| What is the tolerance for the distance indicator at the isocenter for linear accelerators? | +/- 2mm (Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| What is the tolerance for the distance indicator for cobalt-60 units? | +/- 2mm (Mosby's Radiation Therapy Study Guide and Exam Review, p.78) |
| How often should laser QA be performed for laser alignment? | Daily (Mosby's Radiation Therapy Study Guide and Exam Review, p.78) |
| What is the tolerance for laser alignment QA on a non-IMRT linear accelerator? | +/- 2 mm for non-IMRT (Mosby's Radiation Therapy Study Guide and Exam Review, p.78) |
| What is the tolerance for laser alignment QA on an IMRT linear accelerator? | +/- 1.5 mm for IMRT (Mosby's Radiation Therapy Study Guide and Exam Review, p.78) |
| What is the tolerance for laser alignment QA on a SRS/SBRT linear accelerator? | +/- 1.0 mm for SRS/SBRT (Mosby's Radiation Therapy Study Guide and Exam Review, p.78) |
| What is another term for stereotactic interlocks? | Lockout (Mosby's Radiation Therapy Study Guide and Exam Review, p.78) |
| What is the typical field size maximum for a linear accelerator? | 40 cm x 40 cm (Mosby's Radiation Therapy Study Guide and Exam Review, p.77) |
| How often should safety interlocks be checked? | Daily (Mosby's Radiation Therapy Study Guide and Exam Review, p.79) |
| Daily QA on safety interlocks is meant to ensure that the interlocks are ______. | Functional (Mosby's Radiation Therapy Study Guide and Exam Review, p.78) |
| Light field, collimators, and cross hairs are all identified as _______ _________. | Beam indicators (Mosby's Radiation Therapy Study Guide and Exam Review, p.79) |
| How often should dose agreement with beam indicators be checked on a Cobalt-60 unit? | Monthly (Mosby's Radiation Therapy Study Guide and Exam Review, p.79) |
| During brachytherapy QA, what do radiation detectors measure? | Dose rate (Mosby's Radiation Therapy Study Guide and Exam Review, p.81) |
| How often should the radiation detectors used in brachytherapy QA be calibrated? | Monthly (Mosby's Radiation Therapy Study Guide and Exam Review, p.81) |
| Does the repair of a radiation detector for brachytherapy QA warrant a calibration? | Yes (Mosby's Radiation Therapy Study Guide and Exam Review, p.81) |
| How often should brachytherapy sources be checked for physical integrity? | Before each use (Mosby's Radiation Therapy Study Guide and Exam Review, p.81) |
| What are three methods of testing the physical integrity of brachytherapy sources? | Visual inspection, leak testing, and activity measurement (Mosby's Radiation Therapy Study Guide and Exam Review, p.81) |
| How can brachytherapy source uniformity be checked? | Radiographic procedures (Mosby's Radiation Therapy Study Guide and Exam Review, p.81) |
| How can brachytherapy source symmetry be checked? | Radiographic procedures (Mosby's Radiation Therapy Study Guide and Exam Review, p.81) |
| Leakage radiation of brachytherapy sources is detected by what required method? | Wipe testing (Mosby's Radiation Therapy Study Guide and Exam Review, p.81) |
| How often should wipe testing of brachytherapy sources be performed? | Upon receipt and then after every six months (semiannually) (Mosby's Radiation Therapy Study Guide and Exam Review, p.81) |
| After radioactive implantation, when should radiation surveys be performed? | Immediately in and around the patient's room (Mosby's Radiation Therapy Study Guide and Exam Review, p.81) |
| Name the components of a brachytherapy quality assurance program. | Written prescription, patient identification, dates, treatment location, pertinent calculations, complications, and deviance from practice standards. (Mosby's Radiation Therapy Study Guide and Exam Review, p.81) |
| What is the laser tolerance for a conventional simulator? | +/- 2 mm (Mosby's Radiation Therapy Study Guide and Exam Review, p.82) |
| What is the ODI tolerance for a conventional simulator? | +/- 2 mm (Mosby's Radiation Therapy Study Guide and Exam Review, p.82) |
| The tolerance for the accuracy of the CT number of water? | Between -5 and 5 Hounsfield units (Mosby's Radiation Therapy Study Guide and Exam Review, p.82) |
| How often should the HU of water be checked on a CT simulator? | Daily (Mosby's Radiation Therapy Study Guide and Exam Review, p.82) |
| What is the tolerance of the laser alignment with the center of the imaging plane on a CT simulator? | +/- 2 mm (Mosby's Radiation Therapy Study Guide and Exam Review, p.82) |
| How often should the table parameters of a CT simulator be checked? | Monthly (Mosby's Radiation Therapy Study Guide and Exam Review, p.82) |
| How often should the in-plane spatial integrity of the x and y axes be checked on a CT simulator? | Daily (Mosby's Radiation Therapy Study Guide and Exam Review, p.82) |
| What is the tolerance of the spacial integrity of the x and y axes on a CT simulator? | +/- 1 mm (Mosby's Radiation Therapy Study Guide and Exam Review, p.82) |
| Optimal imaging of portal verification devices is ensured by regular ________. | calibration (Mosby's Radiation Therapy Study Guide and Exam Review, p.84) |
| _______ devices should be checked by visual inspection to ensure patient safety. | Immobilization (Mosby's Radiation Therapy Study Guide and Exam Review, p.85) |
| Voids in Cerrobend blocks can be found using ______ . | Radiographs (Mosby's Radiation Therapy Study Guide and Exam Review, p.85) |
| Should the formation of air bubbles during the pouring of Cerrobend blocks be avoided? | Yes (Mosby's Radiation Therapy Study Guide and Exam Review, p.85) |
| Should verification of bolus thickness happen regularly? | Yes (Mosby's Radiation Therapy Study Guide and Exam Review, p.85) |
| How often should the patient's chart be reviewed? | Weekly (Mosby's Radiation Therapy Study Guide and Exam Review, p.86) |
| What is the tolerance of isodose distributions? | +/- 2% (Mosby's Radiation Therapy Study Guide and Exam Review, p.86) |
| What is the tolerance in monitor unit calculations? | +/- 2% (Mosby's Radiation Therapy Study Guide and Exam Review, p.86) |
| What is the mapcheck system? | A tool used in the quality assurance of treatment planning (Mosby's Radiation Therapy Study Guide and Exam Review, p.86) |
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