- Describe the free induction decay (FID) process and explain what
happens to the transverse magnetization during this time.
- Describe the general magnetic field condition that produces the
initial de-phasing of protons following an excitation pulse..
- Explain the concept of T2* and describe its general relationship to
- Describe and illustrate how a 180 degree RF pulse produces re-phasing
- Describe the common characteristic or feature of all spin-echo imaging
- Sketch a diagram showing the RF pulses used in a basic spin-echo cycle
and show the time intervals, TR and TE.
- Describe the relationship between TE and the RF pulse time intervals
in spin echo.
- Explain why the spin echo imaging method can be used for producing T2
- Explain how changing the value of TE from 15 msec to 150 msec affects
- Select typical values of TR and TE to be used with the spin echo
method to produce:
T1 weighted images
T2 weighted images
Proton density weighted images
- Explain the concept of multiple echo imaging and why it is useful.
- Describe the inversion recovery imaging method.
- Illustrate and explain how inversion recovery can produce images with
more T1 contrast than the spin echo method.
- Describe the relationship between TI and the RF pulse time intervals
in inversion recovery.
- Explain the general effect of changing TI on image contrast with
- Sketch a diagram showing the RF pulses and time intervals, TR, TI, and
TE used in inversion recovery.
- Explain the general effect of changing TR from a value of 100 msec to
500 msec on the signal intensity and relative brightness of a spin-echo
- Explain the general effect of changing TE on the signal intensity and
relative brightness of a spin-echo image.
- State typical protocol factor values used to produce a T1 weighted
image with the inversion recovery method.
- Compare and describe the general difference between T1 images produced
with the spin-echo and inversion methods.