repetition time


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rep·e·ti·tion time (TR),

in magnetic resonance imaging, the time between repetitions of the pulse sequence.

repetition time

An MRI term for the timespan between successive pulse sequences applied to the same slice, which is delineated by initiating the first radio frequency (RF) pulse of the sequence and then repeating the same RF pulse at a time t. TR variations are important in controlling image contrast characteristics. Short TRs (< 1000 ms) are used to enhance T1 contrast; long TRs (> 1500 ms) are commonly used to enhance T2 contrast. TR is a major factor in total scan time.

rep·e·ti·tion time

(TR) (rep'ĕ-tish'ŭn tīm)
magnetic resonance imaging The time between repetitions of the pulse sequence.
References in periodicals archive ?
is the relative losses power in the neutral conductor, calculated in the repetition time period T, due to the current [i.sub.n] flow.
is the module of the voltage space vector, which in pqr coordinates coincides with the direction of the axis p; [P.sub.AV] and [p.sub.puls] are, respectively, the constant calculated in the repetition time period, and the variable components of the instantaneous active power of the ESS; [i.sub.p-] and [i.sub.p~] are, respectively, the constant and variable components of the projection of the generalized space vector of the current on the p-axis of the pqr coordinate system; [q.sub.q] and [q.sub.r] are, respectively, the instantaneous reactive power with respect to r-axis and q-axis.
or for the average, calculated in the repetition time period, value
Conventional spin echo presented moderately low percentage error with the choice of repetition time and echo time.
Conclusion: The role of repetition time and echo time in T1-weighted images was crucial to sustain the image quality.
In common fMRI experiments, MRI scanner acquires whole brain data at an interval of 2 seconds, also called repetition time. To meet the real-time requirements, all the processing steps of real-time fMRI need to be completed within a repetition time.
Real-time fMRI signal is three-dimensional volume data at each scan during a repetition time and the intensity of each voxelrepresentsthe blood oxygen level associatedwithneural activities.
Here, six pairs of logistic differential diagnosis models between each two CKD pathological types were established, and the indices for distinguishing special CKD pathological type were evaluated by value of odds ratio ( OR ) or the repetition times in order.
(10) Eight rows for each subject on each repetition times two repetitions times 94 subjects (64 subjects doing it in groups + 32 subjects doing it individually).