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

High-density barium sulfate suspension

Answer

Low-density barium paste

Answer

Air contrast (double contrast) alone

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

Left lateral decubitus

Answer

Prone position

Answer

Reverse Trendelenburg

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

Alternating between high and low kVp to enhance contrast

Answer

Rapidly acquiring sequential spot images for cine analysis

Answer

Using grid pulsing to suppress scatter radiation

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

Directly into the fallopian tubes via laparoscopic cannula

Answer

Into the peritoneal cavity via transabdominal puncture

Answer

Intravenously to opacify the uterine vasculature

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

Quantum mottle at the image periphery

Answer

Heel effect creating brightness gradient across the image

Answer

Motion unsharpness due to long exposure times

Question 6

During a micturating cystourethrogram (MCU/VCUG), what are the two primary diagnostic aims of the examination?

Accepted Answer

To evaluate urethral anatomy and detect vesicoureteral reflux during voiding

Answer

To measure bladder capacity and assess renal function

Answer

To determine post-void residual and classify bladder calculi

Answer

To assess bladder wall thickness and detect mucosal polyps

Question 7

What safety principle does the fluoroscopic 'dead man switch' enforce?

Accepted Answer

It requires continuous operator pressure to maintain X-ray production, preventing inadvertent prolonged exposure

Answer

It triggers an emergency shutdown of the entire X-ray generator on release

Answer

It automatically logs total fluoroscopy time to the PACS system

Answer

It prevents accidental patient movement by locking the table