Which statement correctly defines TR and TE timing in MRI?

Which statement correctly defines TR and TE timing in MRI?

• A. TR is the time to repeat; TE is the time to echo
• B. TR is the time to echo; TE is the time to repeat
• C. TR and TE are measured in seconds; TR uses milliseconds
• D. TR is the brightness measure; TE is the density

Answer: (A)

Understanding TR and TE timing in MRI is about how the timing between pulses and the resulting signal echoes shapes image contrast. Repetition time is the time from the start of one RF pulse to the start of the next RF pulse for the same slice. Echo time is the time from that RF pulse to the peak of the echo signal that is recorded. These timings are typically expressed in milliseconds on most scanners and determine how much T1 or T2 weighting you get in the image. So, the statement that TR is the time to repeat and TE is the time to echo is the correct one. The other options mix up the definitions, or describe properties (like brightness or density) that aren’t the definitions of these timing parameters.

Understanding TR and TE timing in MRI is about how the timing between pulses and the resulting signal echoes shapes image contrast. Repetition time is the time from the start of one RF pulse to the start of the next RF pulse for the same slice. Echo time is the time from that RF pulse to the peak of the echo signal that is recorded. These timings are typically expressed in milliseconds on most scanners and determine how much T1 or T2 weighting you get in the image. So, the statement that TR is the time to repeat and TE is the time to echo is the correct one. The other options mix up the definitions, or describe properties (like brightness or density) that aren’t the definitions of these timing parameters.