Time-Varying Gradient Basic: Slew Rate

Question 1

What is one of the most important things to consider when evaluating threats associated with the gradients?

Answer 1

Slew rate

Question 2

What is the unit of measure for slew rate?

Answer 2

T/m/s (Tesla per meter per second)

Question 3

Which represents gradient fields - dB/dt or dB/dx?

Answer 3

dB/dt is the one assiciated with gradients. dB/dx is the one for the main magnetic field

Question 4

What units are the maximum gradient measured in?

Answer 4

mT/m

Question 5

What major component of the MRI system is responsible for peripheral nerve stimulation?

Answer 5

the gradient coils

Question 6

Does “B” always refer to the main magnetic field?

Answer 6

No. B0 refers to the main magnetic field but “B” could refer to any magnetic field including the gradients

Question 7

T/F - mT/m/ms is the same as T/m/s

Answer 7

True: the “milis” cancel each other out so they are the same.