Can I use a Mid 2011 27 inch iMac (Thunderbolt) as a display for a PC?

Question

There are other questions on here that are similar, but I believe they relate to older models. If this is a dupe please close it though - I just want to find out if this can be done.

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I bought a 27 inch iMac (iMac12,2). The back port cluster looks like this (on the right):

*from apple.com

I wonder if I can use those Thunderbolt ports as inputs from a PC? The PC will be running a Radeon HD 4850 (i.e. it has enough juice to power the display).

Can it be done?