How Many Amps Is this breaker?
You say an X-Ray machine? To be honest if you can afford one of those you need a certified electrical to install it. Otherwise, poof - Something will burn and insurance (assuming you got some?) is out the door!

100A machine, assuming 220Volt, that is 22Killowats typical rating! Assuming the machine runs at 220volts, it could run at 500volts or 1000volts? 

As the comments suggest its really difficult by just looking at the wires. 

My guess is that the central bars are separate phases on which the breakers draw power from, at 220 volts, without extra information there is no way to tell. The top left and right rails are neutral rails because they are split, but even ground/earth rails can be split and joined somewhere else. We really need to see the bigger picture here.

Because this is an commercial device, by what it looks like running in a domestic environment, the safe answer will be No. You cannot connect the XRAY machine into that panel.

You should find out the maximum rating of the current phase/phases you got there and or apply for a new phase if needed. But even if they are more that sub panel just simply cannot handle 100A@220Volts using those power rails, long term load could be disastrous. Typically you will need a dedicated sub panel for to supply such a device.