MRI (magnetic resonance imaging) scanner

MRI (magnetic resonance imaging) is a non-invasive method of using magnets and radio waves to look deep into the human body. MRI provides much greater detail than traditional X-ray can help doctors diagnose a wide range of diseases. This article is a non-technical summary in terms of patients, to help those who at one point scan, or what is involved undergone.
We all tend to expect the worst, and it’s very normal to worry about any medical procedure, but the MRI scan is really no need to worry, and although the technology of MRI is very complicated, requiring only a small number of patients other than lie down, breathe normally and put up with some noise – more on that later …
If you visit the hospital as an outpatient, it is useful to consider what you wear on the day of the scan. MRI uses a strong magnetic field, so you should not avoid wearing clothing that metal fasteners, zippers, buckles, etc., in this case does not get changed. Before you scan (or guardian / career for children / elderly or sick) will be asked to remove metal such as watches, eyeglasses, hairpins, etc., or items that are damaged by a magnet (eg credit cards) and hand the majority hospitals will be a box where your valuables have been made.
Scanning typically last 20 to 30 minutes (longer in some cases) and is a good idea to visit the toilet before the scan, so you can feel as relaxed as possible.
After searching the room, you see that the machine itself is quite a large cube-shaped with a horizontal hole or tunnel in the center where the patient is transferred to the motorized table, until the body part directly be scanned in the middle of the magnetic field of the machine.
The most striking part of the MRI scan and a part that often the biggest surprise is the sound. I can not explain the exact technical reasons for the sound, but who has an MRI scan will knowingly nod as you mentioned – the machine is very noisy and will be available earplugs or some kind of headphones to help reduce the effect. Once inside the tunnel radiologist usually ask if you are OK, and then leave. Now it’s time to try to settle into a comfortable position, so if you can. If you are on the radio or CD, try to match the music and focus your attention on it as a way to get your body to relax.
Sometimes you need to add scanning with a small dye injection MRI – this is known as contrast injection and can help radiologists to the veins easier to see a clearer picture if you have previously had surgery, including orthopedic implants, metal plates or pins (all of which must be addressed to the radiographer before the scan).
source http://elektromedik.com/mri-magnetic-resonance-imaging-scanner/