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Table 5 Optimization of MRI spin echo parameters TE and TR for T2 parametric contrast enhancement between atheroma and fibrous tissue at 9.4 T (see Figure 6). Different combinations of TE and TR generate T1-, proton density- and T2- weighting and their relative appearance on gray scale.

From: MRI of coronary artery atherosclerosis in rabbits: Histopathology-MRI correlation and atheroma characterization

TR (ms)

TE (ms)

MRI Signal Intensity on gray scale

2000

10–30

dark; heavy T1 wt

2000

20–40, 50–80

gray; medium T1 wt

1000

2–10

bright; T2 wt

1000

30–70

dark; heavy T1 wt

800

10–20

gray; medium T1 wt

200

20–70

dark; heavy T1 wt