Electromagnetic shielding for high field MRI coils
A coil and radio frequency coil technology, applied in the measurement of magnetic variables, measurement devices, instruments, etc., can solve the problems of radiation loss, electromagnetic coupling and the reduction of the effectiveness of the radiation coil, and achieve the effect of reducing radiation loss, reducing SAR, and increasing SNR
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[0028] Referring to FIG. 1 , a magnetic resonance imaging scanner 10 includes a scanner housing 12 in which is at least partially disposed a patient or other imaging subject 16 . Cosmetic bore liner 18 of scanner housing 12 optionally delineates a cylindrical bore or opening of scanner housing 12 in which imaging subject 16 is disposed. A main magnet 20 disposed in the scanner housing 12 is controlled by a main magnet controller 22 to generate a main magnetic field B in the imaged subject 16 0 . Typically, the main magnet 20 is a durable superconducting permanent magnet surrounded by cryoshrouding 24 . The main magnet 20 generates a main magnetic field, typically about 3 Tesla or higher. In some embodiments, the main magnetic field is about 7 Tesla.
[0029] Magnetic field gradient coils 28 are arranged in or on housing 12 to superimpose selected magnetic field gradients on the main magnetic field. Typically, the magnetic field gradient coils include coils for generating t...
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