Fat has a long T1 and a long T2.

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Decay and recovery times are used to produce images with specific contrast.For example, water has a long T1 and long T2, fat has a short T1 and short T2, cerebrospinal fluid has a long T1 and long T2, white matter has a short T1 and short T2, and gray matter has an intermediate T1 and intermediate T2 (see Figure 12-14).If we were to create an image at a time when these curves were widely separated, we would produce an image that has high contrast between these tissues.

Fat Has a Long T1 and a Long T2