ARRT Contrast Media 2

Question 1

A patient with a serum creatinine of 1.8 mg/dL is scheduled for a contrast-enhanced CT. Which action is most appropriate?

Accepted Answer

Notify the radiologist and consider pre-hydration protocols

Answer

Elevated creatinine indicates impaired renal function, requiring radiologist notification and consideration of pre-hydration or dose reduction to minimize contrast-induced nephropathy risk.

Question 2

Which type of iodinated contrast media is considered safest for patients at risk for contrast-induced nephropathy?

Accepted Answer

Iso-osmolar nonionic contrast

Answer

Iso-osmolar nonionic contrast (e.g., iodixanol) has the lowest nephrotoxic potential and is preferred for high-risk patients.

Question 3

During a CT pulmonary angiography, the technologist notices extravasation of contrast at the injection site. What is the first action?

Accepted Answer

Stop the injection immediately and notify the radiologist

Answer

Extravasation can cause tissue injury; the injection must be stopped immediately and the radiologist informed for proper management.

Question 4

Which oral contrast agent is most commonly used in CT of the abdomen and pelvis to opacify the bowel?

Accepted Answer

Barium sulfate suspension or dilute water-soluble iodinated contrast

Answer

Barium sulfate or dilute iodinated contrast (e.g., dilute Gastrografin) are the standard oral agents used to opacify the GI tract in abdominal/pelvic CT.

Question 5

What is the primary purpose of the portal venous phase in a multiphasic liver CT protocol?

Accepted Answer

To demonstrate maximum enhancement of the liver parenchyma for lesion detection

Answer

The portal venous phase (approximately 60–70 seconds post-injection) provides peak liver parenchymal enhancement, optimizing detection of hypovascular metastases.

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

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

ARRT Contrast Media 2