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TR (Repetition Time) in Magnetic Resonance Imaging (MRI) is the time interval between successive pulse sequences applied to the same slice. Specifically, TR is the duration between the application of one RF (radiofrequency) pulse and the next.
What are TR and TE? TR and TE are basic pulse sequence parameters and stand for repetition time and echo time respectively. They are typically measured in milliseconds (ms). The echo time (TE) represents the time from the center of the RF-pulse to the center of the echo.
Repetition Time or TR is defined as the time between successive radiofrequency pulses (RF) for each slice. TR is a primary or controlling factor of T1 weighting. The lower the TR the more T1 weighting the resulting image will have. The longer the TR the less T1 weighting we will see in the image.
Spin Echo sequence is based on repetition of 90° and 180° RF pulses. Spin Echo sequence have two parameters: Echo Time (TE) is the time between the 90° RF pulse and MR signal sampling, corresponding to maximum of echo. The 180° RF pulse is applied at time TE/2.
A spin echo sequence has two essential parameters: TR and TE. TR is the time interval between two successive 90° RF waves. It conditions the longitudinal relaxation of the explored tissues (depending on T1).
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The article explains MRI sequence parameters, providing a comprehensive guide to understanding different MRI sequences and their applications in radiology.
