= J. Thomas Vaughan, Jr.
{c}
= J. Thomas Vaughan
{c}
{synonym}
= J. T. Vaughan
{c}
{synonym}
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.<7T vs. 4T: RF power, homogeneity, and signal-to-noise comparison in head images by J. Thomas Vaughan, Jr. and others>[Abstract: human-head comparison of signal-to-noise ratio, RF field and power requirements]{ref}
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