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Free study guide for the ARRT® CT exam

CT Registry Study Guide

The short, essential review: what to know, the numbers to memorize, and how to prepare — organized by the 2026 content specifications.

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  • 18 pages
  • PDF, 1 MB
  • Version 1.1
  • Free, CC BY-NC-ND 4.0

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What the guide covers

Fourteen short sections that follow the ARRT® CT content specifications effective September 1, 2026. Clinical figures were checked against ACR, AAPM, NCRP and other primary sources.

  1. The exam and how to prepareFormat, eligibility, an 8-week plan
  2. Patient careLabs, contrast, injection, reactions
  3. Radiation safety and doseCTDIvol, DLP, SSDE, dose reduction
  4. Image formationParameters, acquisition, reconstruction
  5. Image evaluation and archivingWindows, HU, QC, artifacts, DICOM
  6. Head, spine and MSKProtocols, anatomy, pathology
  7. Neck and chestCTPA, cardiac, lung screening
  8. Abdomen and pelvisContrast phases, washout, urography
  9. Additional proceduresCTA, interventional CT, trauma, children
  10. Numbers to knowA one-page review
  11. Practice quiz20 questions with explained answers
  12. Final week and test dayChecklist and exam-day tips
  13. AbbreviationsFrom AAPM to Z
  14. Next step, sources and legal informationPrimary sources listed

Look inside

Tables, formulas and protocols you can review in minutes. Select a page to open it full size.

Radiation safety page with dose formulas and a dose-reduction table
Radiation safetyDose indices and what every factor does.
Abdomen and pelvis page with contrast phase delays and adrenal washout formulas
Abdomen and pelvisPhase timing, washout, key studies.
One-page table of numbers to know for the CT exam
Numbers to knowEverything to memorize on one page.
Practice quiz page with exam-style CT questions
Practice quiz20 questions across all sections.

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Who it’s for

  • Radiologic technologists preparing for the ARRT® CT exam.
  • Technologists cross-training into CT.
  • Educators who want a short, free handout for students.

Share it freely

The guide is published under CC BY-NC-ND 4.0. Print it or send it to classmates free of charge — please keep it unchanged, credit Digital Training Courses and link back to this page. Selling it or publishing modified versions requires written permission.

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Independent resource. This guide is not affiliated with, sponsored by or endorsed by The American Registry of Radiologic Technologists (ARRT), the American College of Radiology or any other organization named in it. ARRT® is a registered trademark of The American Registry of Radiologic Technologists. It is educational material and does not replace facility protocols, regulatory requirements or the judgment of a radiologist or physician.

Version 1.1. Sources and full legal information are at the end of the PDF.