T1

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T1

In magnetic resonance, the time for 63% of longitudinal relaxation to occur; the value is a function of magnetic field strength and the chemical environment of the hydrogen nucleus; for protons in fat and in water, in a 1.5T magnet, about 250 milliseconds and 3000 milliseconds, respectively. A T1-weighted image will have a bright fat signal.

T1/2

symbol for the half-life of a radioactive isotope. Half-life has -t1/2.

T1, T2, ...

symbols for thoracic nerves.

T1, T2

T1

An MRI term for the time constant at which spins realign themselves with the external magnetic field after excitation.

T1

magnetic resonance The time for 63% of longitudinal relaxation to occur; the value is a function of magnetic field strength and the chemical environment of the hydrogen nucleus.