Sequences

After reading this chapter, you should be able:

• To present the members of the spin echo and gradient echo sequence families
• Describe the principles of signal acquisition for each type of sequence
• Explain the contrast obtained, the advantages and disadvantages of each sequence
• Present the sequence acceleration techniques in spin echo
• Examine the effect of inversion-recovery on contrast and its applications
• Define the relationship between TR, flip angle and longitudinal magnetization in gradient echo
• Describe the notion of steady state transverse magnetization in gradient echo, the conditions in which it occurs and its impact on the sequences
• Explain the methods of echoplanar imaging and compensations for the gain in speed