- What CRES Stands For
- Who Issues the Credential
- What the Credential Covers
- How the Meaning Shows Up in the Exam
- Who Holds It and Who Hires for It
- What "Certified" Requires Before You Test
- Exam Format, Fees and Windows
- Keeping the Credential Active
- Studying in the Order the Title Implies
- Frequently Asked Questions
- CRES stands for Certified Radiology Equipment Specialist, a credential from AAMI's ACI program for radiology equipment technicians.
- The exam has 165 multiple-choice questions, a three-hour limit, closed-book conditions and a simple calculator allowed.
- Healthcare IT, technology function and problem solving are each approximately 25% of the exam, together approximately 75%.
- Full certification requires two to four years of full-time BMET experience, depending on your education or military pathway.
What CRES Stands For
CRES stands for Certified Radiology Equipment Specialist. It is a professional credential for biomedical equipment technicians (BMETs) who install, maintain, calibrate and troubleshoot the equipment used in medical imaging and radiology departments. The three words in the title each carry weight:
- Certified means a third-party body has verified both your experience and your knowledge through a standardized examination.
- Radiology Equipment defines the specialty: the imaging systems, their supporting electronics and the networks they depend on.
- Specialist signals depth within the broader biomedical equipment field rather than a general entry-level credential.
If you have seen "CRES" elsewhere, be aware that the same four letters are used by several unrelated credentials in other industries. This article, and this site, concern only the radiology equipment credential. It is also not a radiologic technologist credential: a technologist operates imaging equipment on patients, while a CRES-level professional keeps that equipment working, safe and connected. For a shorter definition, see our explainer on what CRES stands for, or the broader overview at What Is CRES?
Who Issues the Credential
The credential is issued by the Association for the Advancement of Medical Instrumentation (AAMI) and administered through its ACI certification program. You will see ACI described in two ways: AAMI's certification overview calls it the AAMI Certification Institute, while its FAQ page calls it the AAMI Credentials Institute. These are the same AAMI program under two names, not two different issuers. If you run into both labels while researching, there is no conflict to resolve.
What the Credential Covers
The meaning of the title becomes concrete when you look at the examination content outline. AAMI publishes six content areas, and each percentage is labeled approximate. In the order of the current live objectives:
| Domain | Approximate Weight |
|---|---|
| 1. Anatomy & Physiology | 7% |
| 2. Fundamentals of Electricity and Electronics | 10% |
| 3. Healthcare Information Technology | 25% |
| 4. Healthcare Technology and Function | 25% |
| 5. Healthcare Technology Problem Solving | 25% |
| 6. Public (employee, patient, visitor) Safety in the Healthcare Facility | 8% |
Notice what this distribution says about the credential. A "radiology equipment specialist" is not defined primarily by anatomy knowledge or even by electronics theory. Three areas, each approximately 25%, make up roughly three quarters of the exam: how imaging equipment connects to and relies on healthcare IT, how the technology functions, and how you diagnose and solve problems with it. The weights follow the current live objectives rather than the older 2018 weighting, so use current sources when planning. For a deeper breakdown of each area, read our complete guide to all six CRES content areas.
How the Meaning Shows Up in the Exam
Each domain translates the title into testable knowledge. Here is how to read them as a candidate.
Domain 1: Anatomy & Physiology (7%)
The smallest area, but it exists because a specialist must understand what the equipment is imaging and why. You are not diagnosing patients; you are understanding how the body relates to modality design, positioning and image quality.
- Body systems and structures commonly imaged
- How anatomy influences equipment function and settings
- Terminology used by clinicians who report equipment problems
Domain 2: Fundamentals of Electricity and Electronics (10%)
The foundation under every imaging system. Because a simple calculator is permitted, expect questions that involve applying relationships rather than memorizing results.
- Circuit behavior, components and measurement concepts
- Power supplies and signal fundamentals
- Reading and reasoning about electronic behavior in equipment
Domain 3: Healthcare Information Technology (25%)
Modern radiology equipment is a networked device. This domain reflects the reality that a large share of imaging service work involves connectivity, data flow and the systems that store and distribute images.
- Networking concepts as they apply to clinical devices
- How imaging equipment exchanges data with other healthcare systems
- IT-related causes of equipment and workflow problems
Domain 4: Healthcare Technology and Function (25%)
This is the core "equipment" knowledge: how imaging technology works and what each subsystem is responsible for.
- Principles of operation across imaging technologies
- Subsystems, components and their roles
- Maintenance, calibration and performance verification concepts
Domain 5: Healthcare Technology Problem Solving (25%)
Where the "Specialist" label is earned. Scenario-style items ask you to reason from symptoms toward causes and choose sensible next steps.
- Structured troubleshooting logic
- Distinguishing equipment faults from network, environmental or user causes
- Prioritizing actions when a system is down
Domain 6: Public Safety in the Healthcare Facility (8%)
Safety for employees, patients and visitors. For anyone who works around imaging equipment, this is inseparable from the job.
- Safe practices around equipment and the facility environment
- Protecting patients, staff and visitors during service work
- Safety responsibilities that attach to maintenance and repair
Who Holds It and Who Hires for It
The credential is aimed at BMETs and imaging service professionals. Typical settings include:
- Hospital clinical engineering departments that maintain imaging equipment in-house
- Independent service organizations that contract to maintain imaging systems for facilities
- Equipment manufacturers and their field service organizations
- Imaging centers and multi-site health systems that need consistent service competence across locations
A radiology equipment specialist is typically valued because imaging downtime is expensive and disruptive; a facility benefits from staff who can resolve faults quickly and safely. Titles you will see in listings include imaging BMET, radiology equipment technician and field service engineer for imaging. Browse what employers ask for in our overview of CRES jobs, and compare earnings context in the CRES salary guide. Whether the credential justifies the effort for your situation is the subject of our ROI analysis.
What "Certified" Requires Before You Test
"Certified" in this context is not just a passing score. AAMI ties full certification to documented work experience in addition to the exam. There are three pathways to full eligibility:
- An associate degree or higher in electronics, technology or science, plus two years of full-time BMET experience.
- A U.S. military biomedical equipment technology program, plus two years of full-time BMET experience.
- Four years of full-time BMET experience without the degree or military program.
There is also a specialty-focus requirement: at least 40% of your work experience during the preceding two years, or at least 25% during the preceding five years, must be in the designated specialty. A bachelor's degree does not replace the work-experience requirement, and degree or military-program documentation is required whenever you claim one of those pathways.
For the full eligibility walkthrough, see CRES requirements and how to qualify.
Exam Format, Fees and Windows
Format
The examination consists of 165 multiple-choice questions with a three-hour time limit. It is closed-book, and a simple calculator is permitted. Delivery is computer-based at approved Kryterion testing centers, and you schedule through Webassessor. This is a testing-center experience, so plan travel and arrival time rather than assuming a home-based option.
Scoring
Passing is criterion-referenced, with the standard established through the modified Angoff method. That means the pass line reflects judgments about what a minimally competent specialist should know, not a guessed fixed percentage. For that reason you should not trust any claimed universal cutoff; see our explanation of the CRES passing score and what the data does and does not show in CRES pass rate.
Fees
| Item | Member | Nonmember |
|---|---|---|
| Examination fee | $410 | $460 |
| Retake fee | $355 | $405 |
Testing Windows and Deadlines
Regular testing windows run May 1-15 and November 1-15. For the November 1-15, 2026 window, the application deadline is October 16, and late registration closes October 23 with a $50 late fee. Because the windows are short and the application comes first, build your timeline backward from the deadline rather than the test date. Details are collected in CRES exam dates and scheduling, and a total-cost view is in the CRES certification cost breakdown.
Keeping the Credential Active
Certification is not permanent. Renewal requires at least 30 ACI CEUs in a three-year reporting cycle, and at least 15 of those must be in Category IV: Professional Development. You report through My Active CEU Journal and pay a renewal fee of $100 for members or $150 for nonmembers. Current FAQ guidance says the CEUs must be earned by December 31 of the recertification year.
Key Takeaway
Do not calculate your own expiration date. The first cycle length was described differently in earlier handbook material, and that detail could not be verified against the current handbook. Use the actual expiration date assigned to you by ACI, and begin logging CEUs early so the Category IV requirement is not a last-minute scramble.
Studying in the Order the Title Implies
If you want a plan tied to the credential's structure, let the weights guide your sequence. This is one possible ordering, not a mandatory template:
Foundations First
- Domain 2: electricity and electronics, since later domains assume it
- Domain 1: anatomy and physiology, a small area best handled quickly
The Three Large Areas
- Domain 4: technology and function, building equipment fluency
- Domain 3: healthcare IT, tying devices to networks
- Domain 5: problem solving, practicing symptom-to-cause reasoning
Safety and Integration
- Domain 6: safety, then mixed-domain practice under the three-hour limit
Spend proportionally more time where the weight is highest, and use scenario questions for Domain 5 so you practice reasoning rather than recall. For a fuller plan, see the CRES study guide, a quick-reference CRES cheat sheet, and the structured options in CRES training. When you are ready to test yourself against realistic questions, try the CRES practice tests and judge your readiness with the guidance in how hard the CRES exam is.
Frequently Asked Questions
CRES means Certified Radiology Equipment Specialist, a credential issued through AAMI's ACI certification program for technicians who support radiology and imaging equipment. See also what CRES means for a short version.
No. A radiologic technologist operates imaging equipment on patients. CRES covers the people who maintain, troubleshoot and keep imaging equipment safe and connected, which is a biomedical equipment specialty.
No. ACI is the certification program of AAMI. It appears as the AAMI Certification Institute in one place and the AAMI Credentials Institute in another, but both refer to the same AAMI program.
Healthcare Information Technology, Healthcare Technology and Function, and Healthcare Technology Problem Solving are each approximately 25%, together approximately 75% of the exam. Anatomy and Physiology (7%), Electricity and Electronics (10%) and Public Safety (8%) make up the rest.
Yes. Depending on your pathway, full certification requires two years of full-time BMET experience with a qualifying degree or military program, or four years without one. Candidate status is available if you have not yet met the full requirements, and you then have five years to complete them.