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ARRT study guides

Free, evidence-based guides on how to prepare for the ARRT Radiography exam: the study methods that actually work, and how to use them.

Free cheat sheets & diagrams

Memorize the numbers, then see the physics move.

ARRT formula sheet · Labeled x-ray tube · Inverse square law in radiography

Study Strategy

How to Study for the ARRT: What the Science Says

Most of what feels like studying barely works. Here are the evidence-based study methods that actually build durable knowledge for the ARRT Radiography exam, plus focus-block strategies and adaptations for ADHD.

Read guide · 9 min →

A 6-Week ARRT Study Plan Built on Spaced Retrieval

A week-by-week ARRT Radiography study plan built around practice questions instead of reading hours, including what to do when you fall behind, how to read a mock exam score, and how to compress it if you are working clinicals.

Read guide · 8 min →

What Mock Exam Score Means You're Ready

On a full-length, timed mock you're seeing for the first time, about 85% says ready; below 75% means focused work; in between, the category breakdown decides. Why practice banks run softer than the real exam, and why the mock's conditions matter more than its score.

Read guide · 7 min →

Exam Basics

How Many Questions Are on the ARRT Radiography Exam?

The ARRT Radiography exam has 200 scored questions plus 30 unscored pilot questions (230 total), with 230 minutes of test time. Here is the full format, the category-by-category breakdown, and why a passing score of 75 does not mean 75%.

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Why Did I Fail the ARRT Registry?

Failing the ARRT Radiography exam does not end your eligibility: you get three attempts within three years, and there is no waiting period before you reapply. How to read your score report, the deadlines that catch people out, and the reasons capable technologists fail.

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ARRT 2027 Content Specifications: What Changed

The ARRT Radiography exam gets a new content specification on March 1, 2027, and if you test before that date, none of it applies to you. The category weight shifts, the new topics, what was dropped, and which exam you will actually sit.

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Exposure & Technique

The 15% Rule in Radiography, Explained

A 15% change in kVp does to receptor exposure what doubling or halving the mAs does, but the rule is range-dependent, and most explanations leave that out. The arithmetic, the worked examples, and the kVp-squared trap the registry tests.

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kVp vs mAs: What Each One Actually Controls

mAs is how many x-ray photons you make; kVp is how hard they hit. Which one controls contrast, which one controls noise, why neither substitutes for penetration, and how to tell from a question stem which one it wants.

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Related: inverse square law diagram.

Category Guides

ARRT Radiation Safety Study Guide

Safety is 50 of the 200 scored questions, and radiation physics lives here rather than in Image Production. What is tested, the dose limits and regulatory numbers to memorize cold, and the distinctions that get asked directly.

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ARRT Image Production Study Guide

Image Production is 51 of the 200 scored questions and half of it is equipment, not technique. The factor-effect table worth memorizing blank, the digital-imaging habits to unlearn, and the equipment half most students skip.

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Try the labeled x-ray tube diagram.

ARRT Procedures and Positioning Study Guide

Procedures is the largest category at 66 of the 200 scored questions, with Extremity the biggest block. How to decode any projection name, the cervical-versus-lumbar oblique inversion that costs students points, and the central-ray angles to memorize.

Read guide · 9 min →