2. Assume that the RF pulse length is 10 ms, the dephasing gradients last 1 ms, PE blips last 0.2 ms, the rise time for the readout gradient is 0.3 ms,

and the time between readout samples is 0.1 ms. a. Calculate the minimum echo time for a single-shot gradient echo EPI sequence with a matrix size of 128x128. b. What is the minimum echo time for a 4-shot sequence?