Hi -
Having had several brain MRI's, I can answer this one. But I don't know about an "open ended" machine you mention.
The machine I use is fairly "user-friendly." They do put a kind of catcher's mask thing over your face, but it has only a few bars and large openings. That has a mirror attached that is angled so you can see out into the room and see the window where the technician is sitting at the computer. The inside of the MRI machine is also lit and a light ivory color, so you do not have the feeling of being in a tube. Half way through they will access a vein to give the contrast into - take the needle out right away and do the second half. This is if you have not been accessed prior to the scan.
You should get some little foam ear plugs and they can also put some padding by your ears to hold your head a little more snugly, which also baffle some of the noise. The noises are quite distracting and sometimes the whole table vibrates that you are lying on. I sometimes close my eyes as well as open them part of the time. Each part of the scan (with and without the contrast) takes about 12-14 minutes. It seems to go fairly quickly for me. I name the different sounds, and this little game also helps to distract me.
The scan I get for "screening" is a 5mm cut with a 1mm skip.
I hope you will do OK, and your scan will give you good results!
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