I just got back from having my brain scanned via MRI. I want to compare my experience with anyone that has also has an MRI of the brain done.
It was one of the least pleasant experiences I have had in a while. Never mind the confines, I am not at all claustrophobic, I have done caving. Never mind the noise, I have made worse sounds on my machines.
What I did mind greatly were the serious nervous system effects. These included not just tingling but the feeling of electric shocks, minor and not so minor convulsions and the induction of heart arrhythmias. That includes a fairly long run of atrial fibrillation for about 30 seconds. I almost called a halt to the procedure but continued slowly with breaks between each of the six sequences. After the entire set was finished I felt like I has suffered a serious electric shock (or 10).
The machine is a 1.5 Tesla unit running very standard sequences and 1.5 Tesla isn't supposed to cause neurological side effects.