Hi Lynlee:
Here is an interesting data:
"in a poll of 105 organizations participating in a dial in seminar organized by a non profit health service research firm(ECRI) in September found nearly 60 percent have had MRI "incidents" including projectiles, burns, interference with implants. Most such incidents are not reported to food and drug administration, because reporting is voluntary and varies.(nuclear medicine news NOV 13, 2005)

We really do not clear picture of incidents in regard to MRI as they do not all get reported.
It is so important to report all incidents.

I did extensive research on what to expect from my MRI before the procedure, so the noise was expected.

I would like to know if there are any laws out there which says when a patient press the distress call... respond to them immediately???

Well, I called our state health department, and there are no set laws in regard to response time and patients distress call.
The MRI facility that I went to was did not part of the hospital, so it was up to the facility's discretion what safety measures they implement.