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Equipment Operation and QA Flashcards

7 cards from real ARRT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Equipment Operation and QA flashcards as text

  1. What is the significance of the half-value layer (HVL) in x-ray quality control?

    Answer: It indicates the penetrating ability of the x-ray beam and is used to assess beam quality and filtration adequacy

    HVL is the thickness of a specified material that reduces beam intensity by 50%; it reflects beam energy (quality) and confirms adequate filtration is in place.

  2. Which artifact in digital radiography appears as a bright or dark line and is caused by a row or column of malfunctioning detector elements?

    Answer: Dead pixel line artifact

    A row or column of dead or malfunctioning detector elements produces a straight bright or dark line across the image in that direction.

  3. The Bucky factor (grid factor) is used to:

    Answer: Determine how much exposure must be increased when using a grid compared to non-grid technique

    The Bucky factor represents the ratio of exposure needed with a grid versus without; it accounts for the primary radiation absorbed by the grid and guides technique adjustment.

  4. In a three-phase, twelve-pulse generator, voltage ripple is approximately:

    Answer: 3-4%

    Three-phase 12-pulse generators have a voltage ripple of approximately 3-4%, producing a nearly constant potential and a more efficient, higher average energy x-ray beam.

  5. Which of the following correctly describes the relationship between focal spot size and spatial resolution?

    Answer: A smaller focal spot produces better spatial resolution by reducing geometric unsharpness

    A smaller focal spot reduces geometric unsharpness (penumbra), which improves the sharpness and spatial resolution of the radiographic image.

  6. Which QC test is performed to evaluate the reproducibility of x-ray output?

    Answer: mR/mAs linearity and reproducibility test

    Output reproducibility testing verifies that repeated exposures at identical technique settings yield consistent mR/mAs values (coefficient of variation ≤0.05).

  7. What effect does increasing the source-to-image receptor distance (SID) have on image magnification?

    Answer: Magnification decreases as SID increases

    Increasing SID reduces magnification because the diverging beam geometry becomes more parallel, bringing the projected image closer to true object size.