Annotation of figures from the biomedical imaging literature: a comparative analysis of RadLex and other standardized vocabularies.

Although comprising four to 10 times fewer terms than other vocabularies, RadLex showed excellent performance in indexing radiology-centric content and almost all of the images in a large collection of figures from peer-reviewed biomedical journals were annotated with at least one RadLex term, and almost 75% of theImages were annotation with six or more terms.