CVA Veterinary Radiology and Diagnostic Imaging — Questions and Answers
Question 1: What does the acronym ALARA stand for in veterinary radiation safety?
- As Low As Reasonably Achievable (Correct answer)
- Always Limit Animal Radiation Accumulation
- Approved Laboratory Animal Radiation Act
- Authorized Levels Allowed for Radiographic Applications
Correct answer: As Low As Reasonably Achievable
ALARA stands for 'As Low As Reasonably Achievable' and is the guiding principle of radiation safety. It means minimizing radiation exposure through time (reduce exposure duration), distance (stay as far from the beam as possible), and shielding (use lead aprons, gloves, and thyroid shields).
Question 2: When placing a right lateral radiograph marker on a patient, which identifier should be used?
- L marker, placed on the left side of the image
- R marker, placed on the right side of the image (Correct answer)
- R marker, placed anywhere visible on the film
- No marker is needed for lateral views
Correct answer: R marker, placed on the right side of the image
For a right lateral view, the patient is positioned on its right side and the R marker is placed on the right (dependent) side of the image closest to the cassette. Correct marker placement ensures the radiograph is properly identified and legally defensible as a medical record.
Question 3: Before obtaining radiographs of a female dog, what information should always be confirmed first?
- The dog's vaccination history
- Whether the dog has eaten within the past hour
- Whether the dog could be pregnant (Correct answer)
- The dog's blood type
Correct answer: Whether the dog could be pregnant
Pregnancy status must be confirmed before radiography because ionizing radiation poses a risk to developing fetuses, particularly during the first trimester of organogenesis. If pregnancy is possible or confirmed, the veterinarian must weigh the diagnostic benefit against the risk and often pursue ultrasound as an alternative.
Question 4: What is the purpose of collimation in veterinary radiography?
- To increase the kVp setting for denser tissue
- To restrict the X-ray beam to only the area of interest (Correct answer)
- To chemically develop the radiographic film
- To position the patient in the correct anatomical plane
Correct answer: To restrict the X-ray beam to only the area of interest
Collimation restricts the primary X-ray beam to the anatomical area of interest using adjustable lead shutters in the collimator. This reduces scatter radiation (improving image quality) and minimizes unnecessary radiation exposure to both the patient and personnel.
Question 5: Which of the following is the CORRECT patient position for a ventrodorsal (VD) abdominal radiograph?
- Patient lying on its right side with legs extended
- Patient lying on its left side with legs extended
- Patient lying on its back (dorsal recumbency) with legs extended caudally (Correct answer)
- Patient in sternal recumbency with the head elevated
Correct answer: Patient lying on its back (dorsal recumbency) with legs extended caudally
For a ventrodorsal (VD) view, the patient lies in dorsal recumbency (on its back) so the X-ray beam travels from the ventral surface (belly) through to the dorsal surface. The hindlimbs are extended caudally to prevent superimposition over abdominal structures.
Question 6: Which personal protective equipment (PPE) is MANDATORY for all personnel who must remain in the room during a radiographic exposure?
- Nitrile gloves and surgical mask
- Lead apron, lead gloves, and thyroid shield (Correct answer)
- Safety goggles and hearing protection
- Gown and face shield
Correct answer: Lead apron, lead gloves, and thyroid shield
Anyone remaining in the room during X-ray exposure must wear a lead apron (protects the torso and gonads), lead gloves (protects hands near the beam), and a thyroid shield (protects the highly radiosensitive thyroid gland). Ideally, personnel should step behind a lead barrier or leave the room entirely.
CVA Veterinary Radiology and Diagnostic Imaging
What does the acronym ALARA stand for in veterinary radiation safety?