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t1_weighted_image

T1 weighted image

(also referred to as T1WI) is one of the basic pulse sequences in MRI and demonstrates the differences in the T1 relaxation time of tissues.

The T1WI relies upon the longitudinal relaxation of the net magnetisation vector (NMV). T1 weighting tend to have short TE and TR times.

Fat has a large longitudinal and transverse magnetization, and appears bright on a T1 weighted image. Conversely, water has less longitudinal magnetization prior to a RF pulse, and therefore has less transverse magnetization after a RF pulse. Thus, water has low signal and appears dark.

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t1_weighted_image.txt · Last modified: 2015/01/05 10:56 (external edit)