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Quizzes > Health & Medicine

CT registry exam questions to help you prep for the ARRT CT

Quick, free CT practice test. Instant results and answer review.

Editorial: Review CompletedCreated By: Communist CookiesUpdated Aug 28, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art quiz illustration on sky blue background for CT registry practice test

This CT practice test helps you gauge your readiness for the ARRT CT registry exam with realistic questions and instant scoring. If you want a quick brush-up first, review key structures in our ct anatomy quiz and reinforce fundamentals with a radiographic positioning quiz, then come back to try more questions.

Which component primarily converts incoming X-ray photons into electrical signals in a modern third-generation CT scanner?
Gas ionization chambers using xenon exclusively
Amplification crystals within the X-ray tube target
Solid-state scintillation detectors coupled to photodiodes
Fiber-optic bundles inside the collimator blades
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Increasing window width while keeping window level constant will generally decrease the perceived image contrast.
False
True
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What is the primary purpose of the bow-tie filter in CT?
Improve temporal resolution by shortening rotation time
Shape the beam to patient anatomy and reduce peripheral dose
Correct ring artifacts caused by detector miscalibration
Increase tube output to compensate for attenuation
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In CT, Hounsfield Unit of distilled water at standard conditions is closest to which value?
-100 HU
0 HU
+1000 HU
+100 HU
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Helical pitch is defined as table travel per rotation divided by total collimated beam width.
False
True
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Which image reconstruction approach reduces noise by modeling system physics and statistics compared to traditional filtered back projection?
Overscanning
Retrospective ECG gating
Iterative reconstruction
View sharing
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Using a smaller display field of view (DFOV) on a reconstructed CT image will increase the true in-plane spatial resolution of the reconstruction.
True
False
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Which combination best decreases patient dose while maintaining image quality in an adult chest CT?
Increase kVp from 100 to 140 with fixed mAs
Use automatic tube current modulation and iterative reconstruction
Disable bow-tie filter and reduce pitch
Use the sharpest kernel for soft-tissue imaging
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A typical adult GFR threshold below which iodinated IV contrast is generally avoided or carefully risk-assessed is closest to which value?
eGFR < 15 mL/min/1.73 m2
eGFR < 30 mL/min/1.73 m2
eGFR < 60 mL/min/1.73 m2
eGFR < 90 mL/min/1.73 m2
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Reducing slice thickness (e.g., from 5 mm to 1 mm) generally reduces partial volume averaging.
True
False
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Which premedication regimen is commonly used to reduce the risk of recurrent immediate hypersensitivity-like reactions to iodinated contrast in high-risk patients when time permits?
Oral antibiotics for 3 days prior to contrast
Oral corticosteroids and antihistamines started 12 hours before contrast
High-dose NSAIDs on the day of the exam
Single dose of epinephrine 1 hour before contrast
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The CTDIvol metric represents a standardized estimate of dose for a specific protocol and does not account for scan length.
False
True
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Which parameter change most directly improves temporal resolution in cardiac CT angiography?
Higher pitch with retrospective gating
Shorter gantry rotation time
Lower kVp
Increased detector rows
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Which reconstruction technique preferentially displays high-attenuation voxels along a projection to enhance vascular structures?
Multiplanar reformation (MPR)
Maximum intensity projection (MIP)
Shaded surface display (SSD)
Minimum intensity projection (MinIP)
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The primary advantage of dual-energy CT is the ability to differentiate materials based on energy-dependent attenuation, enabling tasks like virtual noncontrast images and gout detection.
False
True
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Raising kVp from 100 to 120 kVp while holding mAs constant will generally decrease iodine contrast conspicuity on CT angiography of small vessels.
True
False
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Which ECG-gating strategy minimizes radiation dose for coronary CTA when heart rates are stable and low?
Retrospective gating with 100 percent exposure throughout R-R
Prospective ECG-triggered sequential scanning
Retrospective ECG gating with no modulation
Non-gated helical scan at high pitch with 140 kVp
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A pediatric abdomen CT protocol typically requires lower kVp than adult protocols to improve contrast and reduce dose, assuming appropriate mAs adjustment.
False
True
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Which factor most improves low-contrast detectability, assuming dose is held constant?
Smaller matrix size
Sharper reconstruction kernel
Lower image noise via iterative reconstruction
Higher pitch
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Which acquisition parameter change increases the likelihood of windmill artifacts in helical CT?
Axial step-and-shoot mode
Using thin detector collimation with high pitch
Lowering pitch and thicker slices
Using stationary table acquisitions
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Study Outcomes

  1. Understand CT Registry Exam Structure -

    Learn about the format, question types, and scoring methods used in CT registry practice test to navigate the actual exam with confidence.

  2. Apply Core CT Principles -

    Reinforce your grasp of computed tomography fundamentals, including image acquisition, reconstruction, and contrast techniques through practice ct registry questions.

  3. Analyze Diagnostic Images -

    Develop skills in interpreting CT scans by identifying normal anatomy and common pathologies in a ct scan registry review context.

  4. Evaluate Radiation Safety Protocols -

    Assess best practices for radiation protection, dosage optimization, and patient safety procedures essential for ct registry exam practice tests and clinical application.

  5. Identify Knowledge Gaps -

    Use scored feedback from this arrt ct practice test free to pinpoint areas of weakness and focus your study efforts effectively.

  6. Boost Exam Confidence -

    Build test-taking strategies and timing skills that mirror the real exam experience, helping you approach your ct registry practice test with assurance.

Cheat Sheet

  1. Hounsfield Unit Scale & Attenuation -

    Review the formula HU = 1000 × (µ_material - µ_water) / µ_water to understand how tissue densities map on CT images. Remember the mnemonic "Air is - 1000, Water is 0, Bone is +1000" to quickly gauge structures during your ct scan registry review. These values form the foundation of CT image interpretation in any arrt ct practice test free scenario.

  2. Acquisition Parameters: kVp, mA & Pitch -

    Master how kVp influences beam penetration and contrast, mA controls photon quantity, and pitch (table movement per rotation) affects image quality versus scan speed. For a balanced ct registry practice test approach, recall "High kVp for dense structures, low pitch for finer detail." Adjusting these parameters correctly reduces noise and optimizes resolution.

  3. Contrast Media Dynamics & Safety -

    Understand iodine-based agents' wash-in/wash-out phases and tailor injection rates to the vascular territory, guided by protocols from the American College of Radiology. Always confirm renal function (eGFR >30 mL/min) before administration to minimize nephrotoxicity. In your ct registry exam practice tests, emphasize timing and patient screening to score high.

  4. Radiation Dose Metrics: CTDIvol & DLP -

    Know how CTDIvol (mGy) measures per-slice dose and DLP (mGy·cm) reflects total exam exposure. Apply the ALARA principle - "As Low As Reasonably Achievable" - to balance diagnostic quality and safety. Many practice ct registry questions focus on calculating DLP = CTDIvol × scan length, so practice this formula until it's second nature.

  5. Common CT Artifacts & Troubleshooting -

    Identify streaks (beam hardening), rings (detector calibration) and motion artifacts, then apply solutions like filtration, recalibration, or breath-hold coaching. For quick recall, use the phrase "STaR MoVe": Streaking, Rings, Motion - Verify equipment, Evaluate technique. Mastering artifact correction is crucial for acing the ct registry practice test.

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