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Diagnostic Imaging Flashcards

7 cards from real VTNE 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 flashcards as text

  1. Which of the following best describes the term 'window width' in CT image display?

    Answer: The range of Hounsfield units displayed as shades of gray

    Window width determines the range of HU values mapped to the grayscale display; a narrow window increases contrast while a wide window shows a broader range of densities.

  2. A radiograph of a dog's abdomen reveals a 'string of pearls' gas pattern in the small intestine. This is most consistent with:

    Answer: Mechanical small intestinal obstruction

    A 'string of pearls' pattern occurs when small gas bubbles are trapped between folds in an obstructed, fluid-filled small intestine, indicating mechanical obstruction.

  3. During a barium upper GI series, transit time from stomach to ileocecal junction in a healthy dog should be approximately:

    Answer: 1–3 hours

    In dogs, barium typically reaches the ileocecal junction within 1–3 hours of administration; prolonged transit may indicate ileus or obstruction.

  4. Which MRI sequence is most useful for detecting fluid (such as edema or joint effusion) due to its bright fluid signal?

    Answer: T2-weighted

    T2-weighted sequences produce a bright (hyperintense) signal from fluid, making them ideal for identifying edema, joint effusions, spinal cord lesions, and other fluid-containing structures.

  5. What is the recommended technique to confirm correct placement of a nasogastric tube before feeding?

    Answer: Obtain a lateral thoracic/abdominal radiograph

    A lateral radiograph is the gold-standard method to confirm NG tube placement, verifying the tube tip is in the stomach rather than accidentally in the trachea or esophagus.

  6. Which radiation safety measure is most effective at reducing occupational exposure for the veterinary technician?

    Answer: Maximizing distance from the primary beam and using remote positioning aids

    Distance is the most effective protection because radiation intensity decreases with the square of the distance (inverse square law); combined with positioning aids, it minimizes occupational dose.

  7. On an ultrasound exam, a structure that contains no internal echoes and has acoustic enhancement (brighter area behind it) is described as:

    Answer: Anechoic with posterior acoustic enhancement

    An anechoic structure (no internal echoes, appearing black) with posterior acoustic enhancement indicates a fluid-filled lesion such as a cyst, as fluid transmits sound without attenuation.