Which parameter set would yield a T2 weighted image?

Which parameter set would yield a T2 weighted image?

• A. TE: 60 TR: 600
• B. TE: 60 TR: 600
• C. TE: 150 TR: 900
• D. TE: 175 TR: 1250

Answer: (D)

T2 weighting comes from using a long echo time (TE) to let T2 decay differences among tissues become pronounced, while a long repetition time (TR) minimizes T1 contrast so that proton density and T2 differences dominate. The best way to maximize T2 contrast is to have both TE and TR as long as practical. The parameter set with the longest TE (175 ms) and the longest TR (1250 ms) provides the strongest T2-weighted contrast. The other sets, with shorter TE and/or shorter TR, produce more T1 or proton-density weighting and less T2 emphasis.

T2 weighting comes from using a long echo time (TE) to let T2 decay differences among tissues become pronounced, while a long repetition time (TR) minimizes T1 contrast so that proton density and T2 differences dominate. The best way to maximize T2 contrast is to have both TE and TR as long as practical. The parameter set with the longest TE (175 ms) and the longest TR (1250 ms) provides the strongest T2-weighted contrast. The other sets, with shorter TE and/or shorter TR, produce more T1 or proton-density weighting and less T2 emphasis.