- In magnetic resonance, the time for 63% of transverse 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 60 msec and 250 msec respectively. A T.-weighted image will have a bright water signal.* * *breast tumor 2.0 to 5.0 cm [TNM (tumor-node-metastasis) classification]; transverse relaxation time
Medical dictionary. 2011.