ARRT Cross-Sectional Anatomy 3

Question 1

On axial CT of the abdomen, the superior mesenteric artery (SMA) is typically located:

Accepted Answer

Directly anterior to the abdominal aorta, surrounded by fat

Answer

The SMA arises from the anterior aorta and is typically seen as a vessel surrounded by a halo of mesenteric fat on axial CT.

Question 2

Which structure forms the posterior boundary of the adrenal glands on axial CT images?

Accepted Answer

Diaphragmatic crura

Answer

The diaphragmatic crura form the posterior border of the adrenal glands, which lie in the perirenal space.

Question 3

On a coronal CT reconstruction, the right hemidiaphragm is typically higher than the left because:

Accepted Answer

The liver occupies the right upper quadrant and elevates the right hemidiaphragm

Answer

The mass of the liver beneath the right hemidiaphragm elevates it approximately half a rib space higher than the left.

Question 4

On axial brain CT, the internal capsule is bounded medially by which structure?

Accepted Answer

Caudate nucleus

Answer

The anterior limb of the internal capsule is bounded medially by the head of the caudate nucleus.

Question 5

Which of the following correctly identifies the position of the common bile duct on axial CT?

Accepted Answer

Anterior and to the right of the portal vein in the hepatoduodenal ligament

Answer

In the hepatoduodenal ligament, the common bile duct lies anteriorly and to the right of the portal vein, with the hepatic artery to the left.

(ARRT) American Registry of Radiologic Technologists Computed Tomography Certification Practice Test