Module 5

  1. The flat-panel detector determines the edge of a collimated field by how many x-rays strike each DEL. 
    • False:
    • The flat panel detector determines the edge of the collimated field based on how many electrons are present in each detector element (DEL).
  2. Automatic rescaling can compensate for minor errors in technical factor selection without affecting the digital image.
    • True:
    • Automatic rescaling is responsible for digital imaging's ability to respond to a wide range of exposure values
  3. "Dose creep" refers to the progressive reduction in dose to patients as technologists rely on automatic rescaling to compensate for underexposure.  
    • False:
    • "Dose Creep" refers to the potential for patient exposures to gradually increase over time due to a lack of visual cues for over exposure.
  4. A poorly recognized exposure field or collimation borders can lead to miscalculating the exposure indicator for a given part.
    • True:
    • These are the common causes of exposure indicator miscalculation.
  5. Selecting the correct processing code menu for the primary part being examined helps assure images display with consistent brightness and contrast.
  6. Exposure indicators for flat-panel detectors are determined by how much radiation reaches the detector elements or as a result of the histogram analysis.  
    • True:
    • Exposure indicators can be determined by directly measuring  the amount of radiation that reaches a detector element (REX and EXI) or the speed class operation (EI). 
  7. DAP meters measure the exposure levels that the image receptor receive.
    • False:
    • DAP meters measure the exposure levels at the collimator and calculate an entrance skin exposure based on this measurement.
  8. The DAP readout can be considered a part of a patient's permanent record.
    • True:
    • Because the DAP meter measures the entrance skin exposure delivered to the patient, DAP readouts can be considered part of a patient's image record.
  9. CAD stands for "computer aided diagnosis." 
    • False:
    • CAD stands for "computer aided detection." The CAD system only helps radiologists and the rest of the health care team render a diagnosis.
  10. CAD systems can be used with both film/screen and digital imaging systems.  
    • True:
    • Images created on radiographic film can be digitized before the image data are sent to the CAD system to analyze.
  11. A breast tomosynthesis study of one breast exposes a patient to less radiation than a single digital mammogram exposure.
    • False:
    • One breast tomosynthesis exam exposes a patient to approximately 50 percent more radiation than a single digital mammogram exposure. However, a breast tomosynthesis exam may result in the patient needing only one view, which could lower the total exposure.
  12. Less compression is one benefit of breast tomosynthesis for patients.
    • True
    • In the breast tomosynthesis exam, compressing tissue to move anatomy out of the way is not as important because the exam visualizes all breast anatomy.
Card Set
Module 5