Topical Terminology > Repetition Time (Tr)
Repetition Time (Tr)
For Repetition Time (Tr) we have a term and definition in MRI.
Repetition Time (Tr) (MRI) 
The amount of time that exists between successive pulse sequences applied to the same slice. It is delineated by initiating the first RF pulse of the sequence then repeating the same RF pulse at a time t. Variations in the value of TR have an important effect on the control of image contrast characteristics. Short values of TR (< 1000 ms) are common in images exhibiting T1 contrast, and long values of TR (> 1500 ms) are common in images exhibiting T2 contrast. TR is also a major factor in total scan time. See also TR.
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