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To sum up:
Nearly all MR image display tissue contrasts that depend on proton density, T1 and T2 simultaneously. PD, T1 and T2 weighting will vary with sequence parameters, and may differ between different tissues in the same image.
The following table shows T1 and T2 relaxation times for various tissues at 1.5 T.
|T1 (ms)||T2 (ms)|
|Gadolinium||Reduces T1||Reduces T2|
In clinical practice:
It is your turn now! Change the TR and TE sequence parameters and the T1 / T2 times of the tissues and observe the contrast and acquisition time variations.
Don't forget: a good MRI sequence gives high tissue contrast but lasts the shortest time possible!