CAMRT Fluoroscopy and Interventional Radiography 2

Question 1

During an upper GI series, which contrast agent should be used when bowel perforation is suspected?

Accepted Answer

Water-soluble iodinated contrast medium

Answer

Water-soluble iodinated contrast is used when perforation is suspected because barium sulfate in the peritoneal cavity causes severe granulomatous peritonitis; iodinated agents are absorbed and excreted safely.

Question 2

During a double-contrast barium enema, which patient position is used to allow barium to flow from the sigmoid colon into the cecum?

Accepted Answer

Right lateral decubitus

Answer

The right lateral decubitus position uses gravity to direct barium flow from the descending colon and sigmoid into the cecum, which lies in the right lower quadrant.

Question 3

What does 'pulsed fluoroscopy' mean, and what is its primary benefit?

Accepted Answer

Delivering X-rays in discrete pulses rather than continuously, significantly reducing patient dose

Answer

Pulsed fluoroscopy produces X-rays only during brief discrete pulses, displaying each frame as a hold until the next pulse, which can reduce patient dose by 50–90% compared to continuous fluoroscopy.

Question 4

In a hysterosalpingogram (HSG), contrast medium is instilled through which route?

Accepted Answer

Through the cervix into the uterine cavity, with flow into the tubes demonstrating patency

Answer

HSG involves transcervical catheter placement to fill the uterine cavity with contrast; free spill from the fimbriated ends of the fallopian tubes into the peritoneum confirms tubal patency.

Question 5

Which geometric artifact is characteristic of image intensifier-based fluoroscopy systems?

Accepted Answer

Pincushion distortion caused by the curved input phosphor projecting onto a flat output phosphor

Answer

Pincushion distortion arises because straight lines passing near the periphery of the curved image intensifier input screen appear to bow inward, creating a characteristic warping of peripheral structures.

CAMRT - Canadian Association of Medical Radiation Technologists Practice Test

CAMRT - Canadian Association of Medical Radiation Technologists Practice Test

CAMRT Fluoroscopy and Interventional Radiography 2