Medical images are always a challenge as they run on various proprietary software. There are some medical imagery viewer apps available on the App Store but we’re not familiar enough with them to recommend any. If you do go with an iPad app you can easily switch between TrialPad and the viewer app while presenting (using a four-finger-swipe), but we’d recommend practicing the switch in your conference room presenting to a monitor before doing it in front of an audience so you’re familiar with the switching process and what parts of the user interface will be shown. You also have the option of exporting still images, or a video cycling through the images, from a proprietary software into TrialPad which is what most users do.