Medical illustrations and diagrams

High-quality medical illustrations and diagrams form an important part of Radiopaedia.org.

Attribution

All illustrations should have appropriate attribution in the case findings and only be uploaded to Radiopaedia under the following circumstances:

• original illustrations created by you (you still have to state this in the description unless you have added a signature and license information - see below)

• public domain image (source and original file needsneed to be listed in the case findings)

• image reproduced with permission by the author/IP holder (again, this must be explicitly stated).

Quality

Illustrations should have sufficient detail to accurately depict both the basic anatomy of the region and pathology of the condition, in a clear and understandable manner. "Free-style" drawing is discouraged.

Illustrations should also be of high enough resolution as to view all relevant structures easily. Illustrations do not need to contain anatomic structures that are not relevant to the condition being depicted.

Resolution and aspect ratio

• minimum resolution: 1600 x 1600 pixels

• square image ratios only: all other image dimensions are automatically converted to square resolutions with black extension of the canvas when uploaded

Annotations and labels

Annotations and labels can be added hard-coded in the image and/or as in-app annotations.

Hard-coded

• header labels at the top of the image should be in bold with a leading capital letter

• structure labels should be all lower-case (eponyms excepted) in regular font (no bold or italic)

• labelled structures should be indicated using a fine black or white line to the label

  • no arrowheads (these are distracting and do not add to clarity)

  • lines are preferably horizontal, vertical, 45 degrees or a combination of these

• use 'drop shadow' with white text and lines

Fonts

Google Open Sans is the preferred font for all Radiopaedia content.  It It is a free Google font and can be installed on Windows and Mac computers (see External links).

• download Open Sans font

Acceptable alternatives:

• Windows: Myriad are Myriad Pro

• Mac: Helvetica (Windows) and Helvetica Neue (MacOS).

In-app annotations

Relatively recently Radiopaedia now has the ability to add arrow-heads with labels linked to from the text. As such in many instances doing this is beneficial.

For most illustrations it is suggest that you add both a hard-coded version and one without any text and then add annotations in-app. This case is an example.

Artist signature

• the artist's name or initials may be contained within the image in a non-obstructive, non-distracting location, preferably in the bottom right corner; this should not be larger in the vertical dimension than the smallest font size in the image

• creative commonsCreative Commons license is at artist’s discretion, however, the default on Radiopaedia is BY-NC-SA

• do not watermark images

Image background colour

The illustration background colour should ideally be plain white, plain black, or black with a subtle circular grey gradient.

Templates

The following templates illustrate the above requirements and can be easily modified to suit your illustration. Each file includes plain white, plain black and gradient backgrounds - see External links.

• Open Sans font (Windows and macOS (Google Fonts)

• Windows and macOS: PowerPoint template (Dropbox)

• macOS: Keynote template (Dropbox) (macOS)