How do you calculate the slew rate given G=70mT, Gmax=35mT/m, and rise time of 0.3 ms?

To determine the slew rate, you can use the formula which relates the maximum gradient strength, maximum gradient (Gmax), and the rise time. The slew rate is defined as the maximum change in magnetic field gradient strength per unit time.

Given:

• Gmax = 35 mT/m (millitesla per meter)

• The rise time = 0.3 ms (milliseconds)

First, convert the rise time from milliseconds to seconds: 0.3 ms = 0.3 × 10^-3 s = 0.0003 s.

Now, apply the formula for calculating the slew rate. The slew rate (SR) is expressed as: [ SR = \frac{Gmax}{\text{rise time}} ]

Substituting the values: [ SR = \frac{35 \text{ mT/m}}{0.0003 \text{ s}} = \frac{35 × 10^{-3} \text{ T/m}}{0.0003 \text{ s}} = \frac{35}{0.0003} \text{ T/m/s} = 116.67 \text{ T/m/s} ]

Rounding 116.67 T/m/s gives