Quality Control Quiz 1, Quality Assurance

  1. What are the three levels of quality?
    • Expected Quality
    • Perceived Quality
    • Actual Quality
  2. What does Quality Assurance (QA) deal with?
    QA deals with people
  3. Important factors in a QA program are:
    • Monitors proper patient scheduling, reception and preparation.
    • image interpretation to ensure that the radiologist's diagnosis agrees with the patient's disease or condition.
    • Make sure that the patient and clinician are informed promptly with the test results.
  4. What does Quality Control (QC) deal with?
    QC deals with the equipment.
  5. What are the three steps for the quality control program?
    • Acceptance testing-don't allow vendor to check this
    • Routine performance monitoring
    • Maintenance (Pre-maintenance should be up to standards its supposed to be)
  6. What is the first step of the JCAHO process to resolve identified patient care problems?
    Assign responsibility
  7. Filtration
    • Take away weak x-ray beams
    • Measures beam quality which is measured by obtaining the Half Value Layer (HVL). Measured by a digital dosimeter
    • measured annually
    • HVL-of an x-ray beam is the thickness of absorbing material necessary to reduce the x-ray intensity to half of its original value.
  8. Filtration removes low energy beams:
    • Increases quality (uniformity) (take away excess quality)
    • Decreases quantity
  9. Collimation
    • X-ray field must coincide with the light field of the variable aperture light localizing collimator. any kind of misalignment may cause cutoff of pertinent anatomy. These days most machines use Positive Beam Limitation (PBL) collimators or automatic collimation.
    • Measured semi-annually
  10. Collimation misalignment must not exceed:
    +/- 2% of SID
  11. Focal Spot Size
    • Focal spot is part of the target from which x-rays are emitted. The smaller the focal spot; the better the spatial resolution of the image.
    • Measured annually
  12. Small Focal Spot
    small anatomy (ex. Extremities)
  13. Large Focal Spot
    large anatomy (ex. Abdomen)
  14. Focal Spot Size can be measured by using:
    • pinhole camera-excessive exposure
    • the star pattern-limited to focal spot < 0.3mm
    • slit camera-commonly used
  15. Effective focal spot size should be within _____% of size stated in equipment specifications provided by the vendor
  16. kVp Calibration
    • as tech we all set up kVp for every examination (unless pre-programmed due to AEC). Tests are done to ensure the accuracy of kVp selected and that the x-ray generator is accurately calibrated.
    • Measured annually
  17. The measured kVP should be within +/- ___% of the indicated kVp.
    +/- 10%
  18. Exposure Time Accuracy
    • mostly responsible for patient dose. Controlled either by tech or AEC. Medical physicists are using many commercial devices to assess the accuracy of the exposure timer.
    • Measured annually
  19. Exposure timer accuracy should be within +/- ___% of the indicated timer for exposure times greater than 10 ms. AEC must also be checked for consistency on providing optical density regardless of patient thickness.
    +/- 5%
  20. Exposure Linearity
    • test to check whether a radiographic unit is producing constant radiation output for various combinations of mA and exposure time. Tested with a digital dosimeter-how much exposure that's absorbed is the same.
    • Measure annually
  21. The variation of linearity cannot exceed +/- ____%.
    +/- 10%
  22. Exposure Reproducibility
    • Also tested with a digital dosimeter, basically involves kVp, mA and exposure time that is used to produce an optimum image. If any of these factors are changed and then reset again to the same original values, radiation exposure should be precisely the same. Want to be able to reproduce the same image every time.
    • Measured annually
  23. Sequential radiation exposures should be reproducible to within +/- ____%.
    +/- 5%
  24. Radiographic Intensifying Screens
    • Should be cleaned depending on the workload of the department to avoid any appearance of artifact on the final image. Screen cleaner and soft, lint free cloth should be used.
    • Screen-film contact should be evaluated once a year by using a wore mesh pattern test. make sure screen contact is proper.
    • Blurry areas on the film indicates foam or felt pad under screen should be replaced.
  25. Protective Apparel (Ex. Gloves, Aprons & Gonadal Shields)
    • Should be checked annually under fluoroscopy for any defects such as cracks, tears or holes.
    • Checked annually
  26. Film Illuminators (Viewboxes)
    • All nbulbs luminescence of a viewbox should be equal. If a bulb needs replacement, then all bulbs should be replaced.
    • Doctor's viewboxes, if bulbs are dim/not working-won't be able to view picture right
Card Set
Quality Control Quiz 1, Quality Assurance
Quality Control Quiz 1, Quality Assurance