- What the ARRT CT Exam Actually Tests
- Scheduling, Eligibility, and Registration
- Testing Locations and Pearson VUE Centers
- The Four Exam Domains in Detail
- Question Format and What to Expect on Test Day
- Who Hires ARRT CT Certified Technologists
- A Domain-Driven Preparation Timeline
- Frequently Asked Questions
- Procedures (Domain 4) makes up 43% of the ARRT CT exam - it demands the most dedicated study time.
- Image Production (Domain 3) covers 30.3% of questions, focusing on reconstruction, protocols, and artifact recognition.
- The ARRT CT exam is delivered exclusively through Pearson VUE testing centers, with flexible scheduling year-round.
- Candidates must hold a primary ARRT certification (or equivalent) before applying for the CT post-primary exam.
What the ARRT CT Exam Actually Tests
The ARRT Computed Tomography examination is a post-primary certification exam administered by the American Registry of Radiologic Technologists. It is not a general radiology exam with a CT flavor - it is a focused, specialty-level assessment designed to verify that a candidate possesses the clinical knowledge required to operate CT equipment safely, optimize image quality, and perform a wide range of cross-sectional imaging procedures independently.
Understanding what this exam measures is the single most important step before building any preparation plan. The ARRT CT exam is divided into four domains, and those domains are not weighted equally. A candidate who studies without accounting for those weights is likely spending time inefficiently.
The exam covers clinical knowledge that is directly applicable to daily CT practice. Questions are written to assess decision-making, not rote memorization. A candidate might be asked why a specific reconstruction kernel is selected for lung imaging, how to modify a protocol for a pediatric patient, or which scan phase is most appropriate for detecting a hepatocellular carcinoma. These are real clinical scenarios, and the exam reflects that level of specificity.
Scheduling, Eligibility, and Registration
Eligibility Requirements
Before scheduling the ARRT CT exam, candidates must meet the ARRT's requirements for the post-primary pathway. This means holding a current, active primary ARRT certification in an eligible discipline - most commonly Radiography (R), but also Nuclear Medicine Technology, Radiation Therapy, or other qualifying credentials. Candidates must also complete an ARRT-approved structured education requirement in CT and accumulate a defined number of clinical hours performing CT procedures.
Once the ARRT reviews and approves your application, you receive an Authorization to Test (ATT) letter. This letter is your permission to schedule the exam and contains a window during which you must sit for it. Do not wait until the last week of your ATT window to schedule - popular Pearson VUE locations book up, especially in metropolitan areas.
Registration Process
Registration for the ARRT CT post-primary examination is completed through the ARRT's online portal at arrt.org. You will submit your application, pay the required examination fee, and upload documentation of your clinical experience if required. After the ARRT processes your application, the ATT is issued electronically and you log into the Pearson VUE website to select a testing date, time, and location.
The ARRT CT exam is offered year-round, not during limited testing windows. This is a meaningful advantage over some other credentialing exams. It means you can align your testing date with your personal schedule, your current clinical workload, and your readiness - rather than being forced into a specific month.
Testing Locations and Pearson VUE Centers
All ARRT CT examinations are delivered through Pearson VUE, one of the largest testing network providers in the world. Pearson VUE operates hundreds of authorized test centers across the United States and in select international locations, making geographic access to a testing site achievable for most candidates.
To find a testing center near you, visit the Pearson VUE website, select ARRT as the testing program, and use the location search tool. Centers are located in a wide range of settings including standalone testing facilities, university campuses, community college campuses, and professional training centers.
What to Bring and What to Expect
On exam day, candidates are required to present two forms of identification. The primary ID must be government-issued and include a photo and signature - a driver's license or passport is standard. The name on your ID must match exactly the name on your ARRT account. A discrepancy, even a middle name difference, can result in being turned away.
Personal items including phones, watches, wallets, and study materials are stored in a locker before you enter the testing room. You will be provided scratch paper or a whiteboard by the proctor. The testing environment is monitored by both staff and camera systems throughout the examination.
| Item | Allowed in Testing Room | Notes |
|---|---|---|
| Government-issued photo ID | Yes - required | Must match ARRT account name exactly |
| Secondary ID | Yes - required | Credit card, employee badge, etc. |
| Scratch paper / whiteboard | Provided by proctor | Not brought by candidate |
| Personal electronic devices | No | Stored in locker before entry |
| Study notes or reference materials | No | Closed-book examination |
| Earplugs (foam, no electronics) | Generally yes | Confirm with specific Pearson VUE center |
The ARRT CT exam is a computer-based test. Questions are presented one at a time on screen, and candidates can flag questions to review before final submission. The exam interface is intuitive, but candidates who have never taken a computer-based Pearson VUE exam may benefit from reviewing the Pearson VUE tutorial available on their website before test day.
The Four Exam Domains in Detail
Mastering the content of the ARRT CT exam means understanding not just what is covered, but how much each area contributes to your final score. Here is a detailed look at what each domain requires and where the most testable material lives.
Domain 1: Patient Care (13.3%)
Patient Care covers the clinical judgment and interpersonal competencies required before, during, and after CT imaging. While it carries the smallest percentage, it includes topics that are frequently tested through scenario-based questions.
- Contrast media administration: indications, contraindications, and reactions
- Intravenous access and injection techniques specific to power injection in CT
- Patient screening for renal function, allergy history, and medication interactions (e.g., metformin hold protocols)
- Management of contrast reactions from mild urticaria to anaphylaxis
- Informed consent, patient communication, and special population considerations (pediatric, pregnant, bariatric)
Domain 2: Safety (13.3%)
Safety questions test radiation protection principles as they apply specifically to CT - not general radiography. CT delivers substantially higher doses than conventional radiography, and the exam expects candidates to understand dose management deeply.
- CT dosimetry: CTDIvol, DLP, and effective dose concepts
- Dose reduction strategies: tube current modulation, iterative reconstruction, protocol optimization
- Shielding, ALARA principles, and operator safety in the CT suite
- Patient dose considerations for repeat scans, pediatric patients, and pregnant patients
- Regulatory requirements and radiation safety reporting
Domain 3: Image Production (30.3%)
Image Production is the technical backbone of CT and accounts for nearly one-third of the examination. Candidates must understand the physics of CT image formation, the effects of acquisition parameters on image quality, and post-processing tools.
- CT numbers, Hounsfield units, and window/level settings for specific tissues
- Reconstruction algorithms: filtered back projection vs. iterative reconstruction
- Acquisition parameters: pitch, slice thickness, collimation, FOV, and their tradeoffs
- Artifact recognition and correction: beam hardening, motion, ring, streak, and partial volume artifacts
- Multiplanar reformation (MPR), maximum intensity projection (MIP), volume rendering, and 3D post-processing
- Detector configuration and data acquisition systems in multi-detector CT (MDCT)
Domain 4: Procedures (43.0%)
Procedures is the dominant domain and reflects the breadth of anatomical regions and clinical applications covered in CT practice. Candidates must know normal anatomy, pathology indicators, protocol design, and image interpretation fundamentals across all major body systems.
- Head and brain CT: trauma protocols, stroke protocols, contrast-enhanced sequences
- Neck CT: soft tissue neck, CT angiography of carotid arteries, larynx evaluation
- Chest CT: pulmonary embolism protocols, HRCT for interstitial lung disease, lung nodule evaluation
- Abdomen and pelvis: multiphase liver imaging, CT urogram, CT enterography, appendix and bowel protocols
- Vascular CT angiography: aortic dissection, runoff studies, coronary CTA considerations
- Musculoskeletal CT: trauma evaluation, joint imaging, bone mineral density context
- Pediatric CT: age-appropriate protocols and dose adjustment
- CT-guided interventions: biopsy and drainage procedures
Question Format and What to Expect on Test Day
The ARRT CT exam uses single-best-answer multiple choice questions. Each question presents a clinical scenario, a technical situation, or a conceptual problem, followed by four answer options. There is one correct answer and three distractors. The distractors are carefully written - they are plausible to a candidate who has incomplete knowledge, which is exactly why surface-level memorization fails on this exam.
Questions frequently embed clinical context: a patient's age, presenting symptom, prior imaging history, or relevant lab value. Candidates who can integrate clinical knowledge with technical protocol decisions will answer these questions more confidently than those who studied technical facts in isolation.
Key Takeaway
When reviewing practice questions, always read the explanation for both correct and incorrect answer choices. Understanding why a distractor is wrong builds the depth of knowledge the ARRT CT exam requires - especially in the Procedures domain where clinical nuance is central.
The ARRT CT Exam Prep practice tests at this site are designed to mirror the scenario-based format of the actual exam. Working through domain-specific question sets allows you to identify weak areas in Image Production or Procedures before test day, not during it.
Who Hires ARRT CT Certified Technologists
The CT post-primary certification is recognized as a meaningful credential across a wide range of clinical environments. Employers actively seek technologists who hold this certification because it demonstrates a verified, standardized level of competency - particularly important in high-acuity settings where protocol expertise directly affects diagnostic outcomes.
Hospital-based imaging departments are the most common employers, ranging from community hospitals with moderate CT volumes to academic medical centers with advanced CT capabilities including cardiac CT, dual-energy CT, and spectral imaging. Emergency departments at trauma centers rely heavily on certified CT technologists given the volume and urgency of CT studies in trauma, stroke, and pulmonary embolism workflows.
Outpatient imaging centers - including radiology group practices, freestanding imaging facilities, and hospital outpatient departments - hire CT-certified technologists for high-throughput elective imaging. These environments often emphasize protocol efficiency, patient throughput, and consistent image quality across a high volume of routine studies.
Oncology centers and cancer treatment facilities are another significant employer category. CT is integral to radiation therapy planning, tumor staging, and treatment response monitoring. Technologists working in these environments benefit from deep Procedures domain knowledge, particularly for abdomen, pelvis, and chest imaging protocols.
Mobile imaging companies, correctional facilities with medical units, and veteran's health systems also employ CT-certified technologists. As CT technology continues to expand into urgent care settings and even some large outpatient clinics with dedicated scanners, the demand for credentialed CT technologists continues to broaden.
A Domain-Driven Preparation Timeline
Because the ARRT CT exam is weighted so heavily toward Procedures and Image Production, a preparation plan that treats all four domains equally is not efficient. The following six-week timeline is structured around domain weights and assumes a candidate with active clinical CT experience beginning their dedicated study period.
Foundation: Patient Care and Safety (Domains 1 & 2)
- Review contrast media pharmacology, reaction classifications, and emergency management protocols
- Study CT dosimetry: CTDIvol, DLP, and modulation techniques
- Complete a baseline diagnostic quiz on both domains at arrtcttest.com to identify knowledge gaps
Technical Core: Image Production - Physics and Acquisition (Domain 3)
- Study CT physics: detector design, data acquisition, reconstruction methods
- Master acquisition parameters and their clinical tradeoffs (pitch vs. dose vs. resolution)
- Review Hounsfield unit ranges for common tissues and pathologies
Technical Core: Image Production - Artifacts and Post-Processing (Domain 3)
- Systematically review each artifact type: cause, appearance, and correction
- Study multiplanar and 3D post-processing techniques and clinical applications
- Complete Image Production practice sets and review all incorrect answers in depth
Procedures - Head, Neck, Chest, and Vascular (Domain 4, Part 1)
- Study neurological CT protocols: stroke, trauma, and contrast-enhanced brain imaging
- Review chest CT protocols: PE, HRCT, lung cancer screening considerations
- Study CT angiography principles and vascular imaging protocols
Procedures - Abdomen, Pelvis, MSK, and Pediatric (Domain 4, Part 2)
- Study multiphase abdominal protocols: liver, pancreas, kidney, and adrenal imaging
- Review pelvic CT indications and anatomy
- Study pediatric CT protocol modifications and dose considerations
- Review CT-guided intervention basics
Integration and Full-Length Practice
- Complete full-length timed practice exams at the ARRT CT Exam Prep practice test platform
- Identify any remaining weak domains and target those with focused question sets
- Review ARRT CT content specifications one final time
- Confirm test center details, ID requirements, and arrival time
Candidates who need additional detail on maintaining their credential after passing should also review the ARRT CT Continuing Education Requirements 2026, which outlines the biennium CE obligations and structured education credits required to maintain the post-primary CT certification.
For any scheduling updates, changes to testing windows, or fee adjustments that occur during 2026, bookmark the ARRT CT Exam Schedule and Testing Locations 2026 resource for the latest information.
Frequently Asked Questions
The ARRT CT post-primary examination consists of 165 questions, of which 150 are scored and 15 are unscored pilot questions distributed throughout the exam. Candidates receive a total of three and a half hours to complete the examination. The unscored questions are not identified, so approach every question as if it counts.
Yes. Pearson VUE allows candidates to reschedule or cancel an appointment, but there are deadlines and potential fees involved. In general, rescheduling more than 30 days before your appointment carries no fee, while changes within a shorter window may incur charges. Review the current Pearson VUE cancellation policy on their website when you schedule, as terms can be updated.
Prioritize Domain 4 (Procedures) first, followed by Domain 3 (Image Production). Together these two domains account for over 73% of the examination. If your clinical experience has been in a specialty area - for example, primarily neurological or exclusively outpatient - spend extra time on the body system protocols that fall outside your routine daily practice.
Pearson VUE operates international testing centers, and the ARRT does allow qualified candidates to sit for examinations outside the U.S. at approved locations. Availability varies by country. Candidates should verify international center availability through the Pearson VUE website after receiving their Authorization to Test letter from the ARRT.
The ARRT permits candidates to retake a post-primary examination, but there is a mandatory waiting period between attempts. Candidates must also reapply and pay the applicable fee for each retake attempt. The ARRT limits the total number of attempts within a specified period. Review the most current retake policy directly in the ARRT Examinee Handbook, as policies are subject to revision.