Which parameter set would produce a T2 weighted image?

Which parameter set would produce a T2 weighted image?

• A. TE: 60 TR: 600
• B. TE: 200 TR: 500
• C. TE: 175 TR: 1250
• D. TE: 25 TR: 1750

Answer: (C)

Long echo time and long repetition time produce T2 weighting because the image contrast becomes dominated by differences in transverse relaxation rather than proton density or T1 recovery. A long TE lets T2 decay shape the signal, so tissues with longer T2 stay relatively bright while those with shorter T2 fade more. A long TR minimizes T1 effects by allowing substantial recovery between excitations, letting T2 differences stand out more. Among the given sets, the one with TE around 175 ms and TR around 1250 ms has both parameters extended enough to emphasize T2 relaxation. The other options either use a short TE, which reduces T2 contrast, or a short TR, which leaves T1 effects more influential. So the combination with a longer TE and longer TR best yields a T2-weighted image.

Long echo time and long repetition time produce T2 weighting because the image contrast becomes dominated by differences in transverse relaxation rather than proton density or T1 recovery. A long TE lets T2 decay shape the signal, so tissues with longer T2 stay relatively bright while those with shorter T2 fade more. A long TR minimizes T1 effects by allowing substantial recovery between excitations, letting T2 differences stand out more.

Among the given sets, the one with TE around 175 ms and TR around 1250 ms has both parameters extended enough to emphasize T2 relaxation. The other options either use a short TE, which reduces T2 contrast, or a short TR, which leaves T1 effects more influential. So the combination with a longer TE and longer TR best yields a T2-weighted image.