Diagnostic Imaging & Laboratory Testing Flashcards
7 cards from real Animal Care and Veterinary 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 & Laboratory Testing flashcards as text
In veterinary radiography, what does the abbreviation 'VD' indicate about patient positioning?
Answer: The patient is placed on its back with the x-ray beam entering ventrally and exiting dorsally
VD (ventrodorsal) means the x-ray beam enters through the ventral surface and exits through the dorsal surface, with the patient lying on its back.
What is the PRIMARY advantage of using ultrasound over radiography when evaluating abdominal organs?
Answer: Ultrasound provides real-time imaging of soft tissue architecture and internal organ structure without ionizing radiation
Ultrasound excels at evaluating soft tissue organs (liver, kidneys, spleen) and uses sound waves rather than ionizing radiation, making it safer for repeated use.
What is the PRIMARY purpose of using a radiographic grid in veterinary x-ray studies?
Answer: To reduce scatter radiation from reaching the image receptor, improving image contrast
A grid absorbs scatter radiation produced when x-rays interact with tissue, which improves image contrast and detail on the final radiograph.
A 'silhouette sign' on a canine thoracic radiograph occurs when:
Answer: Two structures of the same radiographic opacity are in direct contact, causing their borders to merge and become indistinct
The silhouette sign occurs when two structures of equal radiographic opacity (e.g., fluid and soft tissue) are in contact, causing their shared border to disappear.
For a gastrointestinal contrast study in a dog where intestinal perforation is suspected, which contrast agent should be used?
Answer: Iodinated (water-soluble) contrast medium, because barium is contraindicated if perforation is present
Barium leaking into the peritoneum causes severe inflammation; iodinated water-soluble contrast is used instead when perforation is suspected.
Which radiographic view is routinely obtained alongside the lateral view to fully evaluate the canine thorax?
Answer: Ventrodorsal (VD) or dorsoventral (DV) view
A minimum of two orthogonal views (lateral and VD/DV) are required to fully evaluate thoracic structures in three dimensions.
What does increased radiographic opacity (whiteness) in the lung field on a thoracic radiograph most commonly indicate?
Answer: Fluid, consolidated tissue, or a mass replacing the normal air-filled lung parenchyma
Increased opacity (whiter areas) in the lung represents fluid, consolidation, or mass replacing air-filled alveoli, as fluid and soft tissue absorb more x-rays than air.