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Image Production and Quality Questions and Answers Flashcards

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

Read the first 6 Image Production and Quality Questions and Answers flashcards as text

  1. What is detective quantum efficiency (DQE)?

    Answer: Efficiency of converting X-ray photons into useful signal relative to noise

    DQE measures how efficiently a detector converts X-ray photons into signal while preserving SNR.

  2. A digital radiograph is excessively noisy. Which adjustment most effectively reduces quantum noise?

    Answer: Double the mAs

    Doubling mAs doubles the photon count, reducing noise by the square root of 2.

  3. What is the function of a lookup table (LUT) in digital image processing?

    Answer: Maps raw pixel values to display grayscale values

    LUTs transform raw detector values into optimal display brightness and contrast.

  4. What does signal-to-noise ratio (SNR) measurement indicate about detector performance?

    Answer: Ratio of useful information to random fluctuations

    SNR quantifies the ratio of meaningful signal to noise, indicating image quality potential.

  5. What causes ghosting artefact in CR?

    Answer: Incomplete erasure of a previously exposed plate

    Residual energy from a previous exposure remains due to incomplete erasure.

  6. How does AEC function differently with digital detectors versus film-screen?

    Answer: AEC still controls exposure termination but targets optimal detector exposure (EI) rather than optical density

    AEC targets optimal EI rather than film optical density, but the wide latitude can mask errors.