Hyperpolarized gas imaging

I found while googling this interesting new uses of the MRI:

•Until recently, MRI images of the lung had been very difficult to obtain due to the low hydrogen content of the lung.
•Hyperpolarized gas imaging requires that the patient inhale a laser-polarized noble or inert gas (xenon or helium). The polarized gas makes it possible for MRI to image the lung.
• This technique has already been successful at imaging the lungs of patients with emphysema and has clearly identified the regions of low ventilation that occur due to the disease .

patient problem with MRI

I found this image with the paragraph below in"Getting started in Clinical Radiology" imaging book and was really interesting ,
This patient is well prepared for his examination.He
brought a pair of pliers along to take his jewelry off .It took
him about half an hour.

I can't imagine how would be the resulting image after MRI scan or 
if that metal is highly magnetic and movable during the scan.

So before any MRI scan the Radiologist must get any history 
from the patient about any procedures the has been done before 
or previous accidents or truma because there may by any metallic particle  
that can move during the scan ( read the previous post) especially if foriegn body in eye or brain or if the patient has a cardiac pace maker.

beside danger that might happen , 
also the resultant image will contain artaifacts that prevents report to be 
accurate or even the radiologist may repeat the scan after removing the cause
Tattoos may also hinder imaging gingand heat up and depending on the ingredients . For the
same reason, eyeshadows (which often contain metal)

Missile inside MRI room

Actually there is no true missiles at all but the environment of the magnetic resonance imaging room can make it possible, when the device is turned on and the powerfull magnetic force starts to work (60000 to 140000 times as powerfull as the earth),when the scan is on, appliances and other magnetic materials may become high-speed projectiles .Materials that are dangerous include oxygen bottles, stretchers, and wheelchairs made of magnetic materials.
My friend Lazo had an accident when he was inside the MRI room and the device was turned on by mistake for few seconds(2-4 s) , his mobile was inside his  pocket & Lazo got pulled toward the magnet with a horrible power till the magnet is off ,
Fortuntly nothing happened to him ,so be carefull of MRI.
(The above image was taken from a powerpoint presentaion labeled as Allegra MR scanner at the Cyclotron Research Centre )