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Slew Rate. The gradient slew rate is the speed rate of ascent or descent of a gradient from zero to its maximum amplitude, either positive or negative. Which is the amplitude divided by the rise time in msec. Measured in mT/m/msec or T/m/sec.The shorter the rise time, the faster the gradients and therefore echo spacing.Gradients with a shorter echo spacing will have a better resolution and more slices per TR.itachi expanded its portfolio with the Echelon 1.5T. The MRI scanner combines a compact magnet and a scalable 8-channel RF system with high-performance gradients and slew rate to select short echo times, small field of views, high matrices and thin slices.
What is important is not the absolute value of rise time, but rise time scaled according to the maximum achievable gradient strength. This is encapsulated in the slew rate, defined as. Slew Rate = Peak Gradient Strength Ã· Rise Time. Slew rates are measured in units of Tesla per meter per second (T/m/s).Thus a gradient that ramps from 0 to peak amplitude of 30 mT/m in 0.5 msec would have a slew rate of 60 T/m/s.aveat emptor: The typical gradient strengths and slew rates quoted above are per axis (i.e. values for the x-, y-and z-gradients individually). Some vendors, often those with somewhat inferior gradient performance, will instead quote effective gradient strengths and slew rates.