T2

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T2

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 milliseconds and 250 milliseconds, respectively. A T2-weighted image will have a bright water signal.

T2*

The effective T2 relaxation time, shorter than T2 because of magnetic field inhomogeneities; the observed time constant of free induction decay. In gradient echo images, contrast depends on T2*, whereas in sequences with a 180° rephasing pulse, the contrast depends on T2.
[tē-tū'stăr]

T2

An MRI term for the time constant at which phase coherence among spins oriented at an angle to the static magnetic field is lost due to interactions between the spins, resulting in a loss of transverse magnetisation and MRI signal.

T2

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.
References in periodicals archive ?
Our univariate results support our expectations that sued firms exhibit a significantly larger stock price decline than do matched nonsued firms prior to the litigation date, both in the long term (from T-5 to T-3) and short term (from T-3 to T-2).
For instance, in the quarter from T-2 to T-1, the mean (median) percentage change in sued firm holdings is -0.99% (-0.48%).
Both types of institutional investors trim their positions significantly during the quarter prior to the litigation date (between T-2 and T-1).
For example, the initial row of results for all time intervals from T-6 to T-1 until T-2 to T-1 demonstrates that all potential pairwise comparisons in portfolio revisions between mutual funds and other institutions are significant at the 5% level, except the comparison between mutual funds and independent investment advisors.
Here, we use the same set of variables that we introduced in Panel A of Table I to model the litigation risk for firm i at T-2 as a logistic function:
where %[DELTA]Institutional [Holdings.sub.iT-2, T-1] represents the percentage change in aggregate institutional holdings in firm i between time T-2 and T-1, and [[eta].sub.iT-1] is the random disturbance for the system.
On May 23 and 24, the board held a termination hearing, at which T-2 testified that he "had other things to do" than comply with the directives, that he did not believe that he should have been subject to such orders, and that "if [he] would've done those [things] .
On May 25, the board voted to terminate T-2's employment based on insubordination and neglect of duty.
On June 22, T-2 filed, without an attorney, a civil rights complaint in federal court against the superintendent, the principal, and other school officials.
On 22 January 2002, a three-member panel of the Seventh Circuit (a different panel from the one that had decided T-1's case) affirmed.2 Applying the multi-step test for public employee expression, the court assumed for the sake of argument that 1) T-2's speech was constitutionally protected and 2) it was a substantial or motivating factor in his termination.
T-2 then engaged in a series of unsuccessful attempts to overturn the Seventh Circuit's decision, starting with a petition for certiorari to the U.S.
Player T-1 can run a criss-cross with T-2 and create more combination attacks on the goal.