The gyromagnetic ratio is commonly expressed in which units?

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Multiple Choice

The gyromagnetic ratio is commonly expressed in which units?

Explanation:
The important idea is that the gyromagnetic ratio links magnetic field strength to how fast a magnetic moment precesses, i.e., the Larmor frequency. In practice, we express this as a frequency per unit magnetic field, because the observed precession frequency scales linearly with the field. For nuclei like hydrogen, the commonly tabulated value is γ/2π ≈ 42.58 MHz per Tesla, so the gyromagnetic ratio is frequently given in units of MHz/T. This makes it straightforward to estimate the Larmor frequency at any field: f ≈ 42.58 MHz/T × B0. For example, at 1.5 T, the Larmor frequency is about 63.87 MHz. Other units (Hz/T, kHz/T, GHz/T) are simply different representations, but MHz/T is the standard convention used in MR contexts.

The important idea is that the gyromagnetic ratio links magnetic field strength to how fast a magnetic moment precesses, i.e., the Larmor frequency. In practice, we express this as a frequency per unit magnetic field, because the observed precession frequency scales linearly with the field. For nuclei like hydrogen, the commonly tabulated value is γ/2π ≈ 42.58 MHz per Tesla, so the gyromagnetic ratio is frequently given in units of MHz/T. This makes it straightforward to estimate the Larmor frequency at any field: f ≈ 42.58 MHz/T × B0. For example, at 1.5 T, the Larmor frequency is about 63.87 MHz. Other units (Hz/T, kHz/T, GHz/T) are simply different representations, but MHz/T is the standard convention used in MR contexts.

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