Limited scope study guide

How to Study for the Limited Scope Exam: A 6-Week Study Plan

A practical 6-week plan for the limited scope X-ray exam: what to study each week for the core and your modules, how to use practice questions and mock exams, and how to tell when you're ready.

Updated November 7, 2026. Not affiliated with or endorsed by the ARRT.

Before you start: know exactly what you're studying

The most common limited scope study mistake is studying the wrong things. The ARRT Limited Scope exam has a core that everyone takes and five procedure modules (chest, extremities, skull/sinuses, spine and podiatric), but your state decides which modules are on your exam. A Maryland LXMO candidate takes chest, spine and extremities; an Arizona CPTR's scope is chest and extremities; a Texas LMRT picks the categories they want. Look up your state on our state pages before you open a book.

Then look at where the questions are. The core has 100 scored questions: 18 on patient care, 40 on safety and 42 on image production. Each module has 20 or 25. If you take the core plus two modules, the core is about two thirds of your exam, and safety plus image production alone is more than half. Plan your hours to match.

The 6-week limited scope study plan

This plan assumes about an hour on weekdays and a longer session at the weekend. Stretch it if you have less time or more modules; compress it if you've just finished a limited program and only need review.

Week 1: Set up and patient care

Confirm your state's modules and pass mark, and book your exam date if your state allows it.
Take a short diagnostic quiz in every section you'll be tested on, untimed, to find your starting point.
Study patient care (18 core questions): communication, consent, infection control, body mechanics, vital signs and emergencies.

Week 2: Radiation physics, biology and protection

Radiation physics and radiobiology (12 core questions): how X-rays are made, interactions with matter, cell sensitivity.
Radiation protection (28 core questions, the biggest single block): time, distance and shielding, the inverse square law, dose limits, collimation, pregnancy and ALARA.
Daily: one practice set mixing patient care and safety.

Week 3: Image production

Image acquisition and evaluation (20 core questions): mAs, kVp, SID, grids, exposure indicators and the deviation index.
Equipment operation and quality assurance (22 core questions): the tube, AEC, detectors, processing and QC.
End the week with a timed core-only practice exam.

Week 4: Your first modules

Take the modules you're weakest on first. For each projection learn part position, central ray, centering point and what a correct image shows.
Pair each projection with the anatomy it demonstrates and the most common positioning errors.
Daily: one practice set per module, plus a short core review.

Week 5: Remaining modules and mixed practice

Finish the rest of your modules the same way.
Mix all your sections in each practice session so you get used to switching topics, as on the real exam.
Take your first full-length timed mock exam with only your modules.

Week 6: Mock exams and weak spots

Take one or two more timed mock exams and review every miss, including lucky guesses.
Spend each day's study time on whichever section is lowest.
Book in a rest day before the exam. Cramming new material the night before rarely helps.

How to use practice questions well

Practice questions are for finding what you don't know, not for collecting scores. A few habits make them work:

Read every explanation, including on questions you got right. A correct guess is still a gap.
Keep a miss list. Write each missed concept in one line ("mortise: leg rotated 15 to 20 degrees medially") and review the list every few days.
Track sections separately. Most states require the pass mark on the core and on each module, so an overall average can hide a failing section.
Use fresh questions to judge readiness. Scores on questions you've already seen are inflated by memory.

Mock exams and timing

The core allows 1 hour 55 minutes for 115 questions (100 scored and 15 unscored), and each module allows 25 or 30 minutes. That's about a minute a question, which is comfortable if you know the material and tight if you don't. Take at least two full-length timed mock exams with only your modules, weighted like the real exam, before test day. Review them the same day while your reasoning is fresh.

When are you ready?

You're ready when every section on your exam scores at or above your state's pass mark on new questions, and your mock exams agree. Published pass marks run from 65% to 75%, but we coach to 75% on every section whatever your state publishes, because test-day nerves cost a few points and one weak module can fail the whole attempt. Check your state's exact rule in passing scores by state.

Test-day tips

Bring the ID your exam confirmation asks for and arrive early.
Answer every question. Unscored pilot questions look like scored ones, so treat them all as real.
Flag questions you're unsure of, move on, and come back if time allows.
For positioning questions, picture the patient and the central ray before you read the answer choices.

Want a quick baseline? Take the free 10-question practice test. Limited X-Ray Prep builds this plan around your state: practice sets and micro lessons for only your modules, timed mock exams weighted like the real one, and a readiness dashboard that tracks every section against your pass mark.

Prep for your state's limited scope exam

Pick your state and Limited X-Ray Prep matches your practice questions, micro lessons and timed mock exams to its modules and pass mark. Free to start, no card needed.

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Questions

How long should I study for the limited scope exam?

Many students do well with about six weeks of steady study, roughly an hour on weekdays. If you're starting from scratch or taking all five modules, give yourself longer; if you've just finished a limited program, you may need less.

What's the hardest part of the limited scope exam?

For most students it's the core's physics, radiation protection and image production questions, which make up 82 of the 100 scored core questions. Positioning feels familiar, so it's easy to underprepare the core.

How do I know I'm ready for the limited scope exam?

When you score at or above your state's pass mark on every section, across fresh questions and timed mock exams. We use 75% on every section as our ready line, because most states grade each section separately.