T1

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, T2, ...

symbols for thoracic nerves.

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T1, T2

See relaxation time.

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T1/2

symbol for the half-life of a radioactive isotope. Half-life has -t^1/2.

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.