- The BIET exam covers 18 categories, from Anatomy and Film Processing to Linear Accelerators and Radiation Physics.
- Passing score is 75%, exam fee is $80, and there is no hands-on/practical component.
- Remote testing via ExamRoom.AI adds $16 to the standard $80 fee for the two-hour exam.
- Film Processing and Building Wiring remain on the outline even though many labs have gone filmless - don't skip them.
Overview: What the 18 Domains Actually Mean for You
The Biomedical Imaging Equipment Technician (BIET) certification from ETA International is built around a competency outline with 18 distinct content categories. Unlike broader biomedical certifications that test general electronics knowledge, BIET is specifically about the equipment that produces medical images and the infrastructure that supports it - from film processors and X-ray generators to MRI magnets and linear accelerators.
If you're researching this credential for the first time, it helps to start with the basics before diving into domain content - see What Is BIET? and BIET Meaning for context on the acronym and the certifying body. This guide assumes you already know BIET exists and want the actual content map.
The currently linked competency outline carries a 2019 copyright and lists the same 18 categories referenced throughout this article. That outline is the single most useful document you can study alongside a structured BIET Study Guide, because it tells you exactly what's fair game - nothing more, nothing less.
The 18 BIET Domains, One by One
Below is a working breakdown of each domain. Treat this as your master checklist alongside your notes - cross-reference it with the BIET Cheat Sheet when you're doing final review passes.
Domain 1: Anatomy
Candidates need working knowledge of human anatomical structures relevant to imaging - skeletal, cardiovascular, and organ systems that appear on scans technicians service and calibrate.
- Recognize major anatomical landmarks referenced in imaging protocols
- Understand why anatomical positioning matters for equipment alignment
Domain 2: Medical Terminology
This domain tests fluency in the vocabulary used across imaging departments - abbreviations, prefixes/suffixes, and procedure names you'll encounter in service manuals and clinical requests.
- Common radiologic and clinical abbreviations
- Terminology tied to modalities (sonography, fluoroscopy, tomography)
Domain 3: Computer
Modern imaging equipment runs on embedded computer systems. Expect questions on basic computer architecture, networking concepts, and how imaging workstations interface with hospital systems.
- Operating system basics relevant to imaging consoles
- Network fundamentals (protocols, connectivity troubleshooting)
Domain 4: Electro/Mechanical Safety
Safety testing on imaging equipment - leakage current, grounding, mechanical hazard checks - is a core biomedical technician skill and shows up heavily in scenario-based questions.
- Ground fault and leakage current testing principles
- Mechanical hazard identification on gantries and tables
Domain 5: Picture Archive Communication System (PACS)
PACS questions cover how digital images are stored, transmitted, and retrieved, including the standards that make interoperability possible.
- DICOM basics and image transfer concepts
- Archive/retrieval workflow and common failure points
Domain 6: Diagnostic Ultrasound (Sonography) Equipment
Ultrasound systems use transducers and signal processing distinct from radiographic equipment. This domain tests component function and common maintenance issues.
- Transducer types and probe care
- Signal path from transducer to display
Domain 7: Building Wiring
Imaging equipment draws heavy, often three-phase power. Candidates must understand facility electrical distribution as it relates to imaging suites.
- Single-phase vs. three-phase power basics
- Circuit protection and isolation requirements for imaging rooms
Domain 8: Basic Radiographic Equipment
This is foundational X-ray equipment knowledge - generators, tubes, collimators, and the components that produce a diagnostic image.
- X-ray tube construction and heat management
- Generator types and exposure factor relationships
Domain 9: Film Processing
Even as departments shift toward digital, Film Processing remains part of the outline. Expect questions on chemical processing steps, processor components, and common artifacts.
- Developer, fixer, and wash cycle sequence
- Artifact identification tied to processor malfunction
Domain 10: Test Equipment
Technicians must know which meters and analyzers apply to which imaging tasks - multimeters, oscilloscopes, kVp/dose meters, and similar tools.
- Selecting the correct test instrument for a given measurement
- Reading and interpreting waveform or dose output
Domain 11: Magnetic Resonance Imaging
MRI questions cover magnet types, coil function, and the safety concerns unique to high-field magnetic environments.
- Superconducting magnet basics and quench considerations
- RF and gradient coil roles in image formation
Domain 12: Computed Tomography
CT combines rotating gantry mechanics with radiographic principles. This domain tests detector arrays, reconstruction basics, and gantry maintenance concerns.
- Slice acquisition and detector array function
- Gantry mechanical and cooling system checks
Domain 13: Nuclear Medicine
Nuclear medicine equipment questions focus on gamma camera components and radiopharmaceutical handling considerations relevant to equipment technicians.
- Gamma camera crystal and collimator function
- Radiation detection principles in nuclear imaging
Domain 14: Codes and Regulations
Regulatory knowledge covers the standards bodies and codes governing imaging equipment installation, safety, and compliance.
- Facility and equipment compliance frameworks
- Documentation requirements tied to inspections
Domain 15: Troubleshooting
This domain is scenario-heavy: given a symptom, identify the likely fault and correct diagnostic sequence across modalities.
- Systematic fault isolation methodology
- Cross-modality troubleshooting logic
Domain 16: Radiation Safety
Radiation safety covers protective principles, shielding, and monitoring practices technicians must follow when servicing radiation-producing equipment.
- ALARA principle application
- Shielding and personal dosimetry basics
Domain 17: Radiation Physics
This is the theoretical companion to Radiation Safety - the physics behind how radiation is produced, interacts with matter, and forms images.
- X-ray production and interaction with tissue
- Units of radiation measurement
Domain 18: Linear Accelerators
Linear accelerator questions cover the equipment used in radiation therapy - a specialized but examined area of imaging-adjacent equipment.
- Basic linac component function
- Safety interlocks specific to therapy equipment
Domain Weighting: What the 2019 Outline Tells Us (and Doesn't)
A common question is which domains carry the most weight on exam day. ETA's competency outline lists all 18 categories but does not publish a percentage breakdown per domain in the way some certifications do. That means the smartest strategy is treating every domain as testable rather than gambling on a handful of "high value" areas.
If you want a deeper dive into how this uncertainty affects overall exam difficulty, read How Hard Is the BIET Exam? Complete Difficulty Guide, and for a data-informed view of outcomes, see BIET Pass Rate: What the Data Shows.
Question Format and Exam-Day Mechanics
BIET is a knowledge-based exam with no hands-on/practical component - every domain above is assessed through written questions, not bench work. That's a meaningful distinction from some biomedical credentials that require live equipment demonstrations.
- Passing score: 75% - detailed in BIET Passing Score: Exactly What You Need to Pass
- Exam fee: US$80 for standard registration
- Remote option: ExamRoom.AI remote proctoring adds US$16 on top of the base fee, and requires registration through ETA; the exam runs two hours
- In-person option: Testing through Trapeza or paper/pencil format with an ETA Certification Administrator
- Required materials: Photo ID is mandatory; scratch paper and a non-programmable scientific calculator are permitted, but used scratch paper must be returned before you leave
- Retake policy: One free retake is available within one year of an unsuccessful first attempt, though remote proctoring fees still apply if you retest remotely
For a full cost breakdown including upgrade paths and maintenance fees, see BIET Certification Cost: Complete Pricing Breakdown, and for eligibility specifics review BIET Requirements: Eligibility, Prerequisites & How to Qualify.
Key Takeaway
Because there's no practical/hands-on component, your entire preparation should focus on mastering terminology, component function, and troubleshooting logic across all 18 domains - not physical repair skills.
Mapping the Domains to a Study Schedule
Generic study techniques only matter when they're applied to the specific content you're being tested on. Here's one way to sequence the 18 domains into a multi-week plan, grouping related topics so momentum carries from one week to the next.
Foundations
- Anatomy, Medical Terminology, Computer
- Build a terminology flashcard deck early since it recurs across other domains
Safety and Infrastructure
- Electro/Mechanical Safety, Building Wiring, Test Equipment
- Practice identifying which meter applies to which measurement scenario
Core Radiographic and Digital Systems
- Basic Radiographic Equipment, Film Processing, PACS
- Don't skip Film Processing even if your facility is fully digital
Advanced Modalities
- Diagnostic Ultrasound, MRI, Computed Tomography, Nuclear Medicine
- Focus on component function over deep clinical theory
Radiation and Regulation
- Radiation Safety, Radiation Physics, Linear Accelerators, Codes and Regulations
- Pair physics concepts with safety principles since they overlap heavily
Integration and Review
- Troubleshooting scenarios pulling from all prior domains
- Full practice runs and weak-area review using your cheat sheet
This sequencing works because Troubleshooting is deliberately saved for last - it's the domain that synthesizes knowledge from the other 17, so it makes sense to build the foundation first. For a more comprehensive prep methodology, see the full BIET Study Guide: How to Pass on Your First Attempt.
Who Hires Around These Domains
The domain list itself hints at where BIET-certified technicians end up working: hospital imaging departments, diagnostic imaging centers, and equipment service organizations that maintain radiographic, ultrasound, CT, MRI, and nuclear medicine systems. Employers value the breadth of the 18-domain outline because it signals a technician can move across modalities rather than specializing in just one.
If you're evaluating whether this certification fits your career plans, BIET Jobs covers the kinds of roles that reference this credential, and BIET Salary Guide: Complete Earnings Analysis and Is the BIET Certification Worth It? Complete ROI Analysis go deeper on the career-value question. For those still confirming what the credential entails before committing to a study plan, What Is BIET Certification? and What Does BIET Stand For? offer additional grounding.
| Pathway | Prerequisite | Domain Content Tested |
|---|---|---|
| Standalone BIET | None required | All 18 domains listed above |
| Journeyman CET (BIET specialty) | CETa or all five Electronics Modules (EM1-5); ~2 years experience recommended | Same 18 domains |
| Upgrade from standalone BIET | CETa earned + 2 years combined training/experience + $55 fee | No re-testing of domain content required |
Once certified, maintaining BIET status ties back indirectly to the domains you studied - general maintenance requires 10 related continuing-education hours per year (40 over the four-year term) or supervisor-completed employer verification, plus fees of $25 per year ($100 over four years), with ETA recommending annual submission. Continuing education naturally tends to track the same 18 categories you originally studied. Practice regularly with realistic questions on our BIET practice test platform to keep domain knowledge sharp well past your initial exam date.
Frequently Asked Questions
ETA's competency outline doesn't publish per-domain percentages, so candidates should prepare thoroughly across all 18 categories rather than assuming any domain is safe to skip.
Yes - Film Processing remains one of the 18 categories on the currently linked competency outline, so it's still fair game on the exam regardless of your facility's current equipment mix.
No. The BIET exam has no hands-on examination - all 18 domains are assessed through written questions only.
The remote version through ExamRoom.AI runs two hours, and the passing score across all domains combined is 75%.
You get one free retake within one year of your first exam session, though if you retest remotely the ExamRoom.AI proctoring fee still applies.
Understanding all 18 domains in detail - and how they're tested - is the clearest path to walking into exam day prepared rather than guessing which topics matter most. Pair this domain map with focused practice questions and a realistic review timeline to cover the full breadth ETA expects from a certified Biomedical Imaging Equipment Technician.