Campep Credit Quiz -- Practical Guidelines For Tps Commissioning And Qa

10 Questions | Total Attempts: 101

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Campep Credit Quiz -- Practical Guidelines For Tps Commissioning And Qa

Please take this quiz if you would like to receive 1 CAMPEP credit for attending the webinar, Practical Guidelines for TPS Commissioning and QA. A score of 8/10 or higher is required to receive credit. If you score below 80%, hit the "Try Again" button when your results appear. Contact [email protected] Com with any questions.


Questions and Answers
  • 1. 
    1.TG-244 generally covers issues related to...
    • A. 

      Beam, IGRT and mechanical component quality assurance

    • B. 

      Beam data acquisition techniques

    • C. 

      Dosimetric commissioning including beam data acquisition, modeling and validation

    • D. 

      Evaluation of heterogeneity correction accuracy

  • 2. 
    For IMRT/VMAT verification, TG-244 recommends using...
    • A. 

      Any dosimeter available to the physicist

    • B. 

      Ion chambers and electronic arrays with sufficient resolution

    • C. 

      Ion chamber arrays only

    • D. 

      Ion chamber and film only

  • 3. 
    What initial data set would you use when commissioning a new dose algorithm?
    • A. 

      Collect minimum data according to vendor’s guidelines

    • B. 

      Use vendor-provided golden data

    • C. 

      Collect a subset of vendor-recommended data to spot-check golden data

    • D. 

      Collect vendor-recommended data set plus extra for validation comparisons

  • 4. 
    You would expect dose measured in water at a depth of 5 cm , 2 cm off-axis  in a 20x20 cm2 field to agree with the TPS no worse than to within...
    • A. 

      1%

    • B. 

      2%

    • C. 

      3%

    • D. 

      4%

    • E. 

      5%

  • 5. 
    You would expect dose measured in water at a depth of 5 cm , 2 cm off-axis  in a 20x20 cm2 field with a 60° physical wedge to agree with the TPS no worse than to within
    • A. 

      1%

    • B. 

      2%

    • C. 

      3%

    • D. 

      4%

    • E. 

      5%

  • 6. 
    TG-244 minimum expectation of TPS  dose accuracy outside the primary field is...
    • A. 

      2% of the central axis dose

    • B. 

      3% of the central axis dose

    • C. 

      2% of the local dose

    • D. 

      3% of the local dose

  • 7. 
    TG-244 assumes that for dose calculations in the presence of inhomogeneities (Lung), the user will *not*  use which algorithm:
    • A. 

      Pencil beam

    • B. 

      Collapsed Cone convolution

    • C. 

      Analytical Anisotropic Algorithm

    • D. 

      Grid-Based Boltzmann Solver

    • E. 

      None of the above – any inhomogeneity correction is sufficiently accurate in practice

  • 8. 
    To validate the inhomogeneity correction portion of the algorithm, TG-244 asks the user at a minimum...
    • A. 

      To compare the TPS dose to a well-benchmarked Mote-Carlo code for a variety of clinical conditions.

    • B. 

      To perform measurements in an anthropomorphic thoracic phantom with film and ion chamber for a variety of clinical conditions.

    • C. 

      To perform a set of off-axis dose measurements in a simple heterogeneous phantom for a 30x30cm2 beam.

    • D. 

      To spot-check inhomogeneity correction on a central axis in a simple phantom for a smaller (eg 5x5 cm2 beam).

    • E. 

      Cite a reference on inhomogeneity correction accuracy for a same type algorithm in the commissioning report.

  • 9. 
    While validating IMRT/VMAT, TG-244 mandates the gamma analysis passing rate of at least 90% for the following criteria combination:
    • A. 

      1% dose-error / 1mm distance to agreement

    • B. 

      2%/2mm

    • C. 

      3%/3mm

    • D. 

      5%/3mm

    • E. 

      None of the above

  • 10. 
    For routine QA,  a plan is recalculated and should agree with the reference dose distribution to within...
    • A. 

      1% dose-error / 1mm distance to agreement

    • B. 

      2%/2mm

    • C. 

      3%/3mm

    • D. 

      5%/3mm

    • E. 

      None of the above

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