Ultra-high field MRI (3 teslas and more)  by Denis Hoa
Increasing the strength of the magnetic field is a tempting
technical evolution, promising better signal-to-noise ratio and
reduced acquisition time. The shift to ultra high field (3.0
Teslas and over) does have its pitfalls however and the physical
consequences of increasing the field go beyond simply increasing
the signal-to-noise ratio. It is useful to be aware of the
advantages and limitations of ultra high fields to better
apprehend the possibilities of the technique, which often
involves making compromises - as is always the case in MRI!