The signal thus generated decays exponentially over time due to a number of processes. If the raw, exponential decay of the signal is measured (without doing anything else to create images), the process takes about 100 msec and the exponential time constant associated with that decay is conventionally called "T2*" (read "tee-two-star"). This decay in the measured signal is driven by a number of different physical processes.

First, the protons slowly (on the time scale of seconds for most brain tissue) realign with the main magnet. This is called longitudinal relaxation, and the time constant associated with this exponential process is called T1. Second, the signal generated by the collection of precessing protons is weakened by the

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