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. Author manuscript; available in PMC: 2017 Jul 24.
Published in final edited form as: MAGMA. 2013 Jun 9;27(1):63–70. doi: 10.1007/s10334-013-0387-2

Table 1.

In vivo MR signal sensitivity relationship at 21.1 T

Nuclei γ Frequency (F, MHz) Abundance (A, %) Spin (S) Concentration (C, mM) MR sensitivity
Proton-1 26.8 900 99.9 1/2 95,000 6,026
Sodium-23 7.08 238 100 3/2 45 1
Chlorine-35 2.62 88.2 75.5 3/2 45a 1/20.3
Chlorine-37 2.18 73.4 24.2 3/2 45a 1/105

MR sensitivity relative to sodium is ~ γACS(S + 1)(F)7/4 for low-gamma nuclei and ~γACS(S + 1)F for proton

γ magnetogyric ratio, 10^7 radian/(s * T)

a

Expected concentration, mM