ICVA Veterinary Diagnostic Imaging 2

Question 1

In computed tomography (CT), Hounsfield units (HU) are used to measure:

Accepted Answer

Electron density relative to water

Answer

Hounsfield units quantify the electron density of tissues relative to water (0 HU), with air at -1000 HU and bone at +1000 HU or higher.

Question 2

Which of the following best describes the appearance of acute hemorrhage on T1-weighted MRI?

Accepted Answer

Hypointense (dark)

Answer

Acute hemorrhage (oxyhemoglobin stage, <24 hours) appears hypointense on T1-weighted images due to the paramagnetic properties of intact red blood cells.

Question 3

Nuclear scintigraphy (bone scan) in veterinary patients primarily detects:

Accepted Answer

Areas of increased osteoblastic activity

Answer

Bone scintigraphy using technetium-99m phosphonate complexes detects areas of increased osteoblastic activity and bone remodeling, highlighting active lesions.

Question 4

A dog presents with a caudal abdominal mass. Ultrasound shows a large structure with multiple anechoic compartments separated by hyperechoic septa. This finding is MOST consistent with:

Accepted Answer

Multiloculated cystic structure

Answer

Multiple anechoic compartments separated by hyperechoic septa describe a multiloculated cystic structure, consistent with cystadenoma or multilocular cyst.

Question 5

Which radiographic finding is most consistent with a left-sided congestive heart failure in a dog?

Accepted Answer

Pulmonary venous distension and perihilar interstitial to alveolar pattern

Answer

Left-sided CHF causes pulmonary venous hypertension leading to pulmonary edema, seen radiographically as distended pulmonary veins and a perihilar interstitial to alveolar pattern.

(ICVA) International Council for Veterinary Assessment Practice Test

(ICVA) International Council for Veterinary Assessment Practice Test

ICVA Veterinary Diagnostic Imaging 2