mr pulse sequences

Question 1

Echo Time (TE) =
Repetition Time (TR) =

Answer 1

Echo Time (TE) = Time between excitation and signal reception
Repetition Time (TR) = Time between subsequent excitations

Question 2

Cartesian Sampling Problem

Answer 2

Immediately after excitation, we are exactly in the center of k-space.

Prior to each signal acquisition
we have to reach the appropriate starting point of each line
We move in two steps: horizontally and vertically
We need to reverse the readout gradient.

Question 3

Basic Properties of GRE

Answer 3

Acquisition with short TR possible.

GRE sequences approach a non-zero steady state.

Signal decays with T2*.

Applications:
Rapid and 3D high-resolution imaging
Quantitative imaging