How safe are MRIs? Is there any danger in prolonged exposure to such testing?

My wife has been asked to participate in a research study in which an MRI will be conducted as watches different television programs (or commercials). It pays well but we're wondering if it is safe. They claim it is of course.

Any thoughts?

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MRI uses magnetic fields that penetrate the body. Im sure it is a lot safer than radiation, no comparison really, but perhaps, in my mind more similar to EFM.

People have always said magnetic field is safe but how to know? How can you measure how it affects YOUR energy field? The healers have always said we have a magnet field, or an energy field, and polarities are important in chemical reactions, of which abound in the human body.

You will have to weigh the benefit/rsk. Now if they are going to hunt for aneurysm, cancer, and other issues you could benefit alot by early diagnosis but if they are not going to provide you with any meaningful information I wouldn't do it.