Which MRI parameter set is most associated with proton density weighting?

Which MRI parameter set is most associated with proton density weighting?

• A. TE: 60 TR: 600
• B. TE: 25 TR: 1500
• C. TE: 170 TR: 1250
• D. TE: 200 TR: 500

Answer: (B)

Proton density weighting aims to reflect the actual amount of hydrogen protons in tissues, so you want to minimize contrast from T1 and T2 relaxation. That means using a long repetition time to suppress T1 effects and a short echo time to minimize T2 decay. In practice, proton density weighted imaging uses a long TR (often around 1500 ms or more) and a short TE (around 20 ms). Among the options, the set with a short TE near 25 ms and a long TR near 1500 ms fits this pattern best, emphasizing proton density rather than T1 or T2 differences. The other sets either have short TR (which enhances T1 weighting) or long TE (which enhances T2 weighting), making them less representative of proton density weighting.

Proton density weighting aims to reflect the actual amount of hydrogen protons in tissues, so you want to minimize contrast from T1 and T2 relaxation. That means using a long repetition time to suppress T1 effects and a short echo time to minimize T2 decay. In practice, proton density weighted imaging uses a long TR (often around 1500 ms or more) and a short TE (around 20 ms).

Among the options, the set with a short TE near 25 ms and a long TR near 1500 ms fits this pattern best, emphasizing proton density rather than T1 or T2 differences. The other sets either have short TR (which enhances T1 weighting) or long TE (which enhances T2 weighting), making them less representative of proton density weighting.