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Diagnostic Imaging Equipment Flashcards

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

Read the first 7 Diagnostic Imaging Equipment flashcards as text

  1. What is the function of the Bucky grid in radiographic imaging?

    Answer: Move the grid during exposure to blur grid lines while absorbing scatter

    The Bucky mechanism oscillates the grid during exposure so its lead strips do not appear as artifacts on the image while still absorbing scattered radiation.

  2. In nuclear medicine, the term 'half-life' as applied to a radiopharmaceutical refers to:

    Answer: Time for radioactive decay to reduce activity to half its initial value

    Physical half-life is the time required for half the radioactive atoms in a sample to undergo decay, reducing activity by 50%.

  3. A DICOM workstation cannot retrieve images from the PACS server. After confirming network connectivity, the BMET should verify:

    Answer: AE Title, IP address, and port configuration for both nodes

    DICOM communication requires matching Application Entity (AE) Titles, correct IP addresses, and open TCP ports between devices.

  4. Which MRI safety zone requires strict ferromagnetic screening of all personnel and equipment?

    Answer: Zone IV

    Zone IV is the MRI scanner room itself, where the static magnetic field is always present, requiring the strictest screening.

  5. On a mammography unit, the automatic exposure control (AEC) sensor is placed:

    Answer: Behind the image receptor, in the beam exit path

    The mammography AEC detector is positioned behind (distal to) the image receptor so it samples the transmitted beam to terminate exposure at the correct dose.

  6. During ultrasound transducer acceptance testing, a BMET uses a tissue-equivalent phantom to assess:

    Answer: Dead elements, sensitivity uniformity, and depth penetration

    Tissue-equivalent phantoms with wire targets and grayscale layers allow evaluation of element function, sensitivity uniformity, axial/lateral resolution, and penetration depth.

  7. The half-value layer (HVL) of an X-ray beam is used to characterize:

    Answer: The beam quality (effective energy) based on its penetrating ability

    HVL is the thickness of a specified material that reduces beam intensity by 50%, indicating the beam's effective penetrating energy.