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362 MHz for NMRI - Why?

Discussion in 'Electronic Design' started by Bruce Condine, Mar 7, 2010.

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  1. Would anyone happen to know why 362 MHz is a standard frequency for
    NMRI?

    IOW what atomic or molecular function, etc. does it relate to?

    Bruce Condine
     
  2. : On 7 mar, 11:56, (Bruce Condine) wrote:
    : > Would anyone happen to know why 362 MHz is a standard frequency for
    : > NMRI?

    : gamma = larmor constant, for hydrogen about 42.57 MHz/T
    : So there are no specific frequencies that have to be used.

    : Your frequency probably belongs to a B0 field of 8.5 T. (85000
    : Gauss).

    8.5 teslas sound quite high for a MRI system with a significantly
    sized magnet bore, like those made for medical imaging. An example
    of a device of such caliber is the french Neurospin facility
    http://tinyurl.com/yahy59o . We happen to collaborate with them,
    although not in the high-field MRI stuff.

    For small sample sizes 8.5T is approximately the highest field
    that can be obtained by simple Nb-Ti superconducting magnets operated
    at 4.2K . For higher fields you'd need more expensive and hard-to-
    manufacture materials and/or lower temperature. Maybe the 8.5T is
    adopted as some sort of a standard, eg. in MRI-based chemical
    analysis.

    Regards,
    Mikko
     
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