biology

Radiopaedia

Radiopaedia is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Radiopaedia rather than just read about it. In short: Radiopaedia is a wiki-based international collaborative educational web resource containing a radiology encyclopedia and imaging case repository. It is currently the largest freely available radiology related resource in the world with more than 60,000 patient cases and over 16,000 reference articles on radiology-related topics.

Key takeaways

Radiopaedia belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Radiopaedia to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Radiopaedia from memory before moving on to harder problems.

Reference excerpt

Radiopaedia is a wiki-based international collaborative educational web resource containing a radiology encyclopedia and imaging case repository. It is currently the largest freely available radiology related resource in the world with more than 60,000 patient cases and over 16,000 reference articles on radiology-related topics. The open edit nature of articles allows radiologists, radiology trainees, radiographers, sonographers, and other healthcare professionals interested in medical imaging to refine most content over time. An editorial board peer reviews all contributions.

Background Radiopaedia was started as a past-time project to store radiology notes and cases online by the Australian neuroradiologist Associate Professor Frank Gaillard in December 2005, while he was a radiology resident. Gaillard previously had tried to print out films but they were bulky to carry. He also experimented with saving digital images on thumb drive or hard drives but found that it was difficult to keep track on them. Gaillard built a Linux server to host the site. He then programmed the site using MediaWiki, the same program platform as Wikipedia. Gaillard decided to release it on the web, advocating free dissemination of knowledge. The domain name for radiopaedia.org was registered on 11 January 2007. Gaillard initially allowed the site to be freely editable by anyone. Together with Maryanne McHugh from Toshiba Australia, Gaillard funded the bandwidth of the website. The Radiopaedia.org platform and text content are owned by Radiopaedia Australia Pty Ltd, a privately held company for which Gaillard is the chief executive officer. One of its investors is Investling and its revenue derives from ads, courses, and paid supporters. For image content, contributors reserve some rights and license the content to Radiopaedia and its users under a Creative Commons license. In 2010, almost all of the article and image collection from radswiki (a similar wiki-based radiology educational site) was donated to Radiopaedia.

Purpose Radiopaedia’s mission is "to create the best radiology reference the world has ever seen and to make it available for free, for ever, for all." Its intention is to benefit the radiology community and wider society and it relies on benevolent collaborations from radiologists and others with an interest in medical imaging. Most of the content is shared under a Creative Commons non-commercial license. Similarly to Wikipedia, registered users of the site are allowed to freely add and edit the majority of the content. This allows content to be progressively upgraded over years and for radiologists and society, in general, to continuously refine article content through time. The site also allows registered users to maintain their own personal case library of teaching cases. Rather than individually publishing articles, users are encouraged to integrate content with links to cases and journal articles and collaboratively refine content. In an attempt to reduce vandalism and to peer-review content, an editorial board moderates changes to ensure that the presented material is as accurate and relevant as possible. A survey done in 2020 shows that 90% of on-call radiology trainees in the United States are using Radiopedia and StatDx as the first and second line options to help them during their work. Educational benefit was also demonstrated when integrating Radiopedia-based training in medical curriculum. Another recent study done in 2023 among of 286 radiology residents in India by Humsheer Sethi found Radiopaedia to be the most commonly preferred online resource during on-call duties, with 56.6% of respondents selecting it as their first choice. Its accessibility, case-based content, concise information and coverage of current classifications were cited as reasons for its use.

Subsites Radiopaedia also maintains several subsites, including:

Radiology Signs - a tumblr feed with selected signs Radiology Channel - a YouTube channel containing educational videos

Editorial team The editorial team develop as well as help users to maintain the high-quality content of the website. The current editorial board (2024) is composed of individuals from a variety of countries and includes: Editor-in-chief

Henry Knipe Academic director

Andrew Dixon Community director

Jeremy Jones Founder

Frank Gaillard Managing editors

Andrew Murphy Joachim Feger Vikas Shah

iOS apps In 2009, the first Radiopaedia iOS app series was released in two volumes. These apps packaged cases and articles for users to review and have sample questions and answers. More volumes were released subsequently. All the iOS apps were discontinued after March 2018. Instead, cases in the iOS apps exist in the form of "iOS case packs" playlists on the website.

References

Worked examples

Example 1 — a first encounter with Radiopaedia

Start with the simplest possible case. Write down what Radiopaedia claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Radiopaedia before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Radiopaedia ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Radiopaedia

In research: Radiopaedia appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Radiopaedia in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Radiopaedia is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2005 establishments in Australia, Encyclopedias of medicine, Internet properties established in 2005, so understanding it makes those chapters shorter.
In everyday life: Look for Radiopaedia outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Radiopaedia in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Radiopaedia means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Radiopaedia out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Radiopaedia in simple terms?

Why does Radiopaedia matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Radiopaedia?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Radiopaedia.