E-book in English · 118 illustrated pages · PDF

CT Repair Fundamentals

How a computed tomography system works, how it fails and how to find the fault — the foundation every technician and clinical engineer needs, with vendor-neutral methods that apply across brands.

Language: English onlyThe e-book is published in English. No translated edition is available.
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15chapters
5appendices
65+diagrams and photos
6case studies
Cover of CT Repair Fundamentals
Why this book

CT looks complex. Most of its faults are not.

A tube near the end of its life, a dirty slip ring, a drifting detector module, a couch belt that slips, a calibration made in the wrong conditions, a cooling problem, a network setting. The same short list repeats on every brand. What separates a quick fix from days of swapping expensive parts is understanding how energy, data and control flow through the scanner.

Common situations in the field

  • A new tube is ordered when the real problem was a clogged cooler filter.
  • Rings are calibrated away again and again while a detector module keeps drifting.
  • Random scan aborts are blamed on the generator, but they happen only at the fastest rotation.
  • The last error in the log is treated as the cause, not the first.
  • Images do not reach the PACS and responsibility is unclear between IT and engineering.

What the book gives you

  • One generic block diagram that works on every CT brand.
  • Simple tests that split the chain in half: static vs rotating, kV and mA steps, axial vs helical.
  • Clear criteria to tell a hardware fault from physics, settings or the patient.
  • The signs that announce the end of an X-ray tube weeks in advance.
  • What each calibration corrects, and when not to calibrate.
  • Safety, release tests and documentation after every repair.
Contents

Fifteen chapters, from X-ray physics to the bench

Each chapter combines original diagrams, real photographs, reference tables and a summary of key points.

1

How CT works

Attenuation, Hounsfield units, generations, helical scanning and pitch, reconstruction, windowing and dose.

2

The system, outside and inside

The CT suite, stationary and rotating frames, a generic block diagram, power, cooling and the life of one scan.

3

The X-ray chain

The rotating-anode tube, the high-frequency generator, kV and mA control, bow-tie filters and collimation.

4

Tube heat and protection

Heat capacity and cooling, protection logic, warm-up and seasoning, end-of-life signs and tube replacement.

5

Detectors and the DAS

Scintillators, detector modules, anti-scatter grid, offset and gain, reference channels and temperature.

6

Slip ring and data

Brushes and rings, contactless data links, the encoder, wear, cleaning and communication faults.

7

Gantry mechanics

Rotation drives, the main bearing, balance, tilt, lasers, and diagnosing noise and vibration.

8

The patient couch

Vertical and horizontal drives, position accuracy, manual release and typical faults.

9

Motion control and interlocks

Control architecture, power-up sequence, servo errors, safety chains and collision protection.

10

Console and reconstruction

Host and reconstruction computers, storage, logs, backups and cybersecurity basics.

11

Calibration and image quality

Air and water calibrations, phantoms, image-quality metrics, dose measurement and constancy tests.

12

CT artefacts

Rings, bands, streaks, cupping and patient-related artefacts, with an atlas and a decision table.

13

Fault isolation

The first ten minutes, reading logs, symptom-to-subsystem maps, splitting the chain and six case studies.

14

Safety

Radiation, high voltage and stored energy, rotating parts, heavy components and release after repair.

15

DICOM, PM and service

Network essentials, preventive maintenance, tools, spares, contracts and twenty bench tricks.

Appendices: quick-reference tables, printable checklists and forms, glossary, further reading and image credits.

Sample pages

Designed for reading and printing

Large, comfortable type, consistent layout and illustrations that support the text.

Sample page: chapter opener, How CT Works Sample page: generic CT block diagram Sample page: slip ring layout Sample page: CT artefact atlas
Included

Reference material for daily work

Checklists and forms

Daily start-up, service call record, release after repair, monthly trend sheet and a generic PM outline, as printable pages.

Quick-reference tables

Typical values, symptoms mapped to the first checks, and an artefact decision table.

Edition updates

Corrections and improvements to this edition are provided to buyers at no extra cost.

Get the book

Buy the e-book

One-time payment. Instant download after purchase. Secure checkout by Hotmart in your local currency.

Launch price

CT Repair Fundamentals

E-book in PDF, for individual use.

Language: English only
US$ 27one-time
Regular price US$ 37
  • PDF in English, 118 illustrated pages
  • 15 chapters and 5 appendices
  • Printable checklists and forms
  • Quick-reference fault tables
  • Edition updates included
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7DAYS

7-day refund policy

If the book does not meet your expectations, you can request a full refund through Hotmart within 7 days of purchase.

Audience

Who the book is for

Written for

  • Biomedical equipment technicians starting to support CT.
  • X-ray engineers moving up to computed tomography.
  • Clinical engineering managers standardising how their team works.
  • Independent service engineers and students entering the field.

Not intended as

  • A model-specific service manual, or a source of passwords and service keys.
  • Authorisation to perform internal repairs without training.
  • A guide to clinical scanning technique for radiographers.
EH
About the author

Ethan Harlow

Field service engineer in diagnostic imaging. Ethan wrote this book to give technicians a solid foundation for CT service: how the scanner works, how it fails and how to isolate faults methodically. The book is vendor-neutral and contains no confidential manufacturer material.

FAQ

Frequently asked questions

What language is the e-book written in?

English only. The e-book is published in English and there is no translated edition. The text uses clear technical English with short sentences, diagrams and tables. If you are browsing a translated version of this site, only the website is translated — not the book.

Which CT scanners does the book cover?

It teaches the principles, architecture and methods shared by third-generation CT scanners in general, whatever the manufacturer. It is not a service manual for any specific model.

Do I need prior experience with CT?

No. Basic electronics knowledge helps, and X-ray experience is an advantage, but the book starts from the physics you need and builds up to fault isolation.

Does it include passwords, service keys or OEM manuals?

No. It contains no proprietary or confidential manufacturer information. It helps you use the manufacturer's documentation and tools more effectively.

How do I receive the book?

Immediately after payment, Hotmart sends you access to download the PDF. You can read it on any device or print it.

Can I pay in my own currency?

Yes. The Hotmart checkout displays the price in your local currency and accepts international cards.

Can my whole department use it?

The e-book is licensed for individual use. For a team licence, contact us at [email protected].

What is the refund policy?

You can request a full refund through Hotmart within 7 days of purchase.

CT Repair Fundamentals

In English · 118 pages · 15 chapters · 5 appendices · US$ 27 at launch

Buy the e-book
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CT Repair Fundamentals · English · US$ 27Buy