Which nucleus is represented by the symbol Na in MR spectroscopy lists?

Which nucleus is represented by the symbol Na in MR spectroscopy lists?

• A. Helium
• B. Sodium
• C. Neon
• D. Argon

Answer: (B)

In MR spectroscopy, the symbol corresponds to the nucleus being observed. Na is the chemical symbol for sodium, so the nucleus represented is sodium (specifically the 23Na isotope). This nucleus is MR-active and used in spectroscopy to measure sodium concentrations in tissues, but it is less abundant and signal-intense than protons, requiring specialized techniques. The other options correspond to helium, neon, and argon, which have different symbols (He, Ne, Ar), not Na.

In MR spectroscopy, the symbol corresponds to the nucleus being observed. Na is the chemical symbol for sodium, so the nucleus represented is sodium (specifically the 23Na isotope). This nucleus is MR-active and used in spectroscopy to measure sodium concentrations in tissues, but it is less abundant and signal-intense than protons, requiring specialized techniques. The other options correspond to helium, neon, and argon, which have different symbols (He, Ne, Ar), not Na.