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: 100 TR: 1000
• C. TE: 170 TR: 1250
• D. TE: 25 TR: 1500

Answer: (C)

T2 weighting comes from using a long echo time so that signals decay according to T2 differences, and a long repetition time to minimize T1 contrast between tissues. A long TE lets tissues with shorter T2 lose signal before the echo is formed, making differences in T2 times appear more prominently. A long TR gives the tissues enough time to recover between excitations, reducing T1-driven contrast and letting the T2 differences dominate. Among the options, the parameter set that uses a long TE and also maintains a relatively long TR provides the strongest T2 contrast. That combination yields the clearest T2 weighting, where water-rich tissues can appear bright and others differ primarily by their T2 times. The other sets either use a short TE, which reduces T2 contrast, or a short TR, which reintroduces T1-weighting and diminishes the T2 emphasis.

T2 weighting comes from using a long echo time so that signals decay according to T2 differences, and a long repetition time to minimize T1 contrast between tissues. A long TE lets tissues with shorter T2 lose signal before the echo is formed, making differences in T2 times appear more prominently. A long TR gives the tissues enough time to recover between excitations, reducing T1-driven contrast and letting the T2 differences dominate.

Among the options, the parameter set that uses a long TE and also maintains a relatively long TR provides the strongest T2 contrast. That combination yields the clearest T2 weighting, where water-rich tissues can appear bright and others differ primarily by their T2 times. The other sets either use a short TE, which reduces T2 contrast, or a short TR, which reintroduces T1-weighting and diminishes the T2 emphasis.