In-room imaging and MR planning

T1w vs. T2w contrast: timing considerations

T 2

weighting (Spin Echo)

90 o

90 o

- -

TE : long-ish (~T 2

RF

value: 80 ms)

…

TR : long

( >2x T 1

: >2000 ms)

Gx

…

T 1 weighting (Gradient Echo) - TE : shortest TE possible - TR : needs to be short as well

…

signal

TE

TR

T 2

relaxation

T 1

relaxation

T 1

[ms]

T 2

[ms]

Liver

500

40

Muscle

870

45

White Matter

780

80

Gray Matter

900

100