Contrast vs. T1 and TR

9/12/99


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Table of Contents

Contrast vs. T1 and TR

T1:

T2:

Longitudinal Relaxation Requires Energy at the Larmor Frequency

A 90ƒ RF Pulse

After Each 90ƒ RF Pulse, No Longitudinal Magnetization Remains

Contrast vs. T2 and TE

T1 and T2 Are Correlated

Contrast Emphasis

Spins Dephase due to:

A 180ƒ Pulse is not used in FLASH imaging

Observed Transverse Relaxation Rate, 1/T2 , is the sum of several components:

 Author: Mark Cohen

Email: mscohen@ucla.edu

Home Page: www.brainmapping.org

Other information:
For academic use only. Commercial reproduction is forbidden without express permission of the author.