10 free, exam-style Computed Tomography (ARRT CT) practice questions with answers and explanations. No signup required. Work through them below, then take the full free ARRT CT practice test to study every exam domain.
These 10 free ARRT CT questions are organized by exam domain, so you can see how each part of the Computed Tomography blueprint is tested. Reveal the answer and explanation under each question.
Three minutes after receiving IV iodinated contrast, a patient develops widespread hives, facial swelling, and audible wheezing. Which medication should be administered FIRST?
Correct answer: C - Epinephrine 0.3 mg IM
A patient taking metformin is scheduled for a contrast-enhanced CT of the abdomen and pelvis. According to current guidelines, the technologist should:
Correct answer: B - Proceed with the exam and instruct the patient to hold metformin for 48 hours afterward
A technologist increases the pitch from 1.0 to 1.5 while keeping all other scan parameters constant. Which of the following effects will this change produce?
Correct answer: C - Patient dose decreases by approximately one-third
Which photon interaction with matter is PRIMARILY responsible for subject contrast in CT imaging?
Correct answer: B - Photoelectric absorption
Which component of a CT scanner allows the x-ray tube and detector array to rotate continuously without the use of cables?
Correct answer: D - Slip ring
A CT scan of the abdomen is reconstructed using a 512 × 512 matrix with a display field of view (DFOV) of 320 mm. What is the approximate pixel size?
Correct answer: A - 0.63 mm
Dark bands appearing between the petrous bones on an axial CT image of the posterior fossa are MOST likely caused by:
Correct answer: B - Beam hardening artifact
On a non-contrast head CT, a crescent-shaped hyperdense collection is seen along the right cerebral convexity that crosses the coronal suture line. This finding is MOST consistent with:
Correct answer: D - Subdural hematoma
When performing CT pulmonary angiography (CTPA) for suspected pulmonary embolism, the bolus-tracking region of interest should be placed in the:
Correct answer: C - Main pulmonary artery
A multiphase liver CT demonstrates a lesion with arterial-phase hyperenhancement followed by washout on the portal venous phase. This enhancement pattern is MOST characteristic of:
Correct answer: A - Hepatocellular carcinoma
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