Open-i Biomedical Image Search Engine- Open-i
Q: What is Open-i?
A: Open-i service of the National Library of Medicine that enables search and retrieval of abstracts and images (including charts, graphs, clinical images, etc.) from the open source literature, and biomedical image collections. Searching may be done by text queries as well as by query images. Open-i provides access to over 1.6 million images from about 580,000 PubMedCentral articles and 7,470 chest x-rays with 3,955 radiology reports.

Longer descriptions are available in a research article " Design and Development of a Multimodal Biomedical Information Retrieval System " (link to ) and a technical report (link to )

Q: Are the images in Open-i collection in public domain? May I use a particular image for my project?
A: Open-i images are from one of the following sources:

Below the individual Open-i image is a link to the applicable license type if available.

Please refer to the following web page for information on the PMC open access subset and the PMC Copyright Notice:

If copyright restrictions for an image in the PubMed Central collection are not specified or are unclear, please contact the journal directly.

Images from the Indiana University hospital network are distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (

Images from the Orthopaedic Surgical Anatomy Teaching Collection at the USC Digital Library have the following Rights statement:
Distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License ( which permits unrestricted use, distribution and reproduction in any medium, provided the work is attributed to Irving Rehman, Ph.D., F.I.C.S., and Chadwick F. Smith, M.D., Ph.D., F.A.C.S., F.I.C.S., and source in the manner specified by the publisher.

Please refer to the following web page for copyright information for Images from the History of Medicine:

Q: Can I drag and drop images in Internet Explorer?
A: No, Internet Explorer does not support this feature. Chrome, Firefox, and Safari allow drag and drop.

Q: How do I drag and drop with browsers other than Internet Explorer?
A: Drag the image file onto the Open-i search or results page to initiate an image search. Supported file types supported are .jpeg, .jpg, .gif and .png.

Q: What is the difference between the Citation List view and Image Grid?
A: The citation list view shows the best match image on the left along with citation information on the right, ten items to a page.  The grid view displays one or more images from an article, twenty items to a page.  You may switch between views by clicking on the appropriate icon next to “View as” on the right of the top results bar.

Q: How do I rank my results by date?
A: Open the Rank By section on the left side bar by clicking on the side arrow.  Click on newest or oldest. This only gives more weight to the date, it isn't date sorted.

Q: How do I use limits?
A: By default, no limits are applied to the search.  All image types, subsets, and specialties are searched.  Text is searched in all fields.  Results are ranked in relevance order.

Q: How do I open “View Article” results in a new window?
A: Control-Click on the link to open and view the article in a new browser window.

Q: How do I open “View Similar Images In” results in a new window?
A: Control-Click on the link to open and view the results in a new browser window.

Q: When my browser window is narrow I lose the View Similar Images and View Article links in list view?
A: You are in mobile mode at that point. Click, tap, or swipe the three vertical dots to view those links.

Q: In Chrome, my video doesn't play somtimes, what do I do?
A: We have a known issue for some videos in Chrome. Please do a ctrl-shft-r to refresh the page and the video will play.