Permanent Magnets for MRI 20170312-1
How Strong is the Magnet in MRI System?
As we all know, one of the most important parts of MRI System is permanent magnet. Commonly, it is super strong neodymium magnets with magnetic force of 0.5 to 2.0 Tesla, that is to say, 5000 to 20,000 Gauss. Actually, the magnets with more than 60 Tesla force have already been applied to various research fields, but according to the rules, the magnets with more than 2 Tesla force cannot be allowed to medical treatment. Compared with 0.5 Gauss magnetic field of Earth, we can image that how great of this magnet is!
Since this neodymium magnet is super strong, the MRI room could be a dangerous place without strict management. The metal objects like clips, keys, scissors, stethoscopes and other gadgets can be throw out dangerously, whether it is in the pocket or in your hand. Besides, the data in the credit card or bank card can also be damaged by MRI system. In addition, the magnetism will increase with the distance shorten between NdFeB permanent magnets and the objects. For example, if there is a spanner that away from the magnet 4.6m, there will be a slight pull force. But when the distance is shortening within 1m, the spanner will be struggled out of your hand and be attached to the neodymium permanent magnet. And the larger the objects, the greater the pull force.
Therefore, all the metal items of both patients and doctors should be checked and taken away before enter into scanning room, including embedding device, such as cardiac pacemaker, aneurysm clip and so on, to ensure safety completely.
As we all know, one of the most important parts of MRI System is permanent magnet. Commonly, it is super strong neodymium magnets with magnetic force of 0.5 to 2.0 Tesla, that is to say, 5000 to 20,000 Gauss. Actually, the magnets with more than 60 Tesla force have already been applied to various research fields, but according to the rules, the magnets with more than 2 Tesla force cannot be allowed to medical treatment. Compared with 0.5 Gauss magnetic field of Earth, we can image that how great of this magnet is!
Since this neodymium magnet is super strong, the MRI room could be a dangerous place without strict management. The metal objects like clips, keys, scissors, stethoscopes and other gadgets can be throw out dangerously, whether it is in the pocket or in your hand. Besides, the data in the credit card or bank card can also be damaged by MRI system. In addition, the magnetism will increase with the distance shorten between NdFeB permanent magnets and the objects. For example, if there is a spanner that away from the magnet 4.6m, there will be a slight pull force. But when the distance is shortening within 1m, the spanner will be struggled out of your hand and be attached to the neodymium permanent magnet. And the larger the objects, the greater the pull force.
Therefore, all the metal items of both patients and doctors should be checked and taken away before enter into scanning room, including embedding device, such as cardiac pacemaker, aneurysm clip and so on, to ensure safety completely.