A researcher in magnetic resonance imaging instrumentation. His team’s 2001 comparison of head imaging at 7 T and 4 T examined signal-to-noise ratio, radio-frequency field uniformity and power requirements together. Increasing the main magnetic field can improve the measured signal while making the excitation field harder to control across the head. The comparison demonstrates why high-field imaging requires electromagnetic design and measurements of spatial uniformity in addition to a stronger magnet.[ref]
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