[ENH] Add Intracranial Electrode Contact Picking GUI (PyQt)

The intracranial electrophysiology analysis pipeline could use a manual or semiautomated GUI to pick the locations of the electrode contacts based on a CT that has been aligned to the MR of that subject so that brain structures can be used to aid contact identification.

Basic Requirements:

• A CT and MR viewer that can scroll through slices like freeview
• A list selection to scroll through channel names from a raw object and associate them with a location on the CT in MR (surface RAS) space
• Ability to change the colormap to see color ranges within the CT more clearly as well as for the MR to make brain structures clearer
• An RAS locator to describe where you are in RAS space (helpful for use and this is also like freeview)

Advanced Requirements:

• A 3D viewer of the head with representations of “devices” or groups of contacts like an ECoG grid or sEEG electrode which more closely resembles surgical plans and so makes it easier to identify which device is which
• Speed of execution
• An automated algorithm to identify locations where electrode contacts are likely to be (likely using voxel_neighbors) to speed up location
• Contact coloring should be roughly orthogonal in ~24 dimensional space for sEEG patients with approximately that number of devices, also it looks nice if the device is colored the same

cc @larsoner

[agramfort]

let’s do a video call to discuss this ok?

[larsoner]

… and instead of returning the localized positions, it can just set info['chs']['loc'] directly. That way at the end if you do raw.save(...) that instance will have the correct locations.

People can always use raw.get_montage if they want to see the locations they set.