T1 relaxation time (or spin-lattice relaxation time), is a biological parameter that is used in MRIs to distinguish between tissue types.
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Example Usage of T1
abby621: RT @deffenbaugh: LOL! RT @digg_2000: "Best Man Rigs Newlyweds Bed To Tweet During Sex." - http://digg.com/d21Cfol?T1
halfmanhalfbeer: Waiting for EK codeshare flight to Muscat, had to chk-in at T3, departure gate is in T1. Brilliant.
deffenbaugh: LOL! RT @digg_2000: "Best Man Rigs Newlyweds Bed To Tweet During Sex." - http://digg.com/d21Cfol?T1