Signatures on images within a case on Radiopaedia are restricted to images that may be reasonably defined as art (typically a medical illustration).
When submitting an artistic image with a signature, please ensure that the signature is tastefully subtle and in the bottom right hand corner, or of low contrast in another non-eye-catching location.
Definition of art
For the purposes of images on this site, art is defined as: an image created through an extended period of creative interpretation, not easily reproducible by another party 1.
Using this definition, an image that is "created" requires that the entirety of the image be generated by the artist. This excludes annotations or drawings on medical images (e.g. radiographs, CT, MR).
Not art
Simple diagrams, including line diagrams, would not constitute art according to this definition, as they are easily reproducible and do not take an extended period of time to produce.