B₀

B₀, that is "B subscript zero", is also generally used in Magnetic Resonance Imaging to denote the net magnetization vector.[1] Although in physics and mathematics the notation to represent a physical quantity can be arbitrary, it is generally accepted in the literature, such as the International Society for Magnetic Resonance in Medicine that B₀ represents net magnetization. This is particularly prominent in areas of science where magnetic fields are important such as spectroscopy. By convention, B₀ is interpreted as a vector quantity pointing the z-direction, with subsequent x and y cartesian axes oriented with the right hand rule.[2]

B₀ is also the symbol often used to denote the reference magnetization in which equations with electromagnetic fields are normalized.

References

Deichmann, Ralf; Filippi, Massimo (2016). Principles of MRI and Functional MRI. New York, NY: Springer New York. pp. 3–28. ISBN 978-1-4939-5611-1.
Dale, Brian M; Brown, Mark A; Semelka, Richard C (2015). Production of net magnetization. MRI Basic Principles and Applications. John Wiley & Sons, Ltd. pp. 1–9. doi:10.1002/9781119013068.ch1.

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[1] Deichmann, Ralf; Filippi, Massimo (2016). Principles of MRI and Functional MRI. New York, NY: Springer New York. pp. 3–28. ISBN 978-1-4939-5611-1.

[2] Dale, Brian M; Brown, Mark A; Semelka, Richard C (2015). Production of net magnetization. MRI Basic Principles and Applications. John Wiley & Sons, Ltd. pp. 1–9. doi:10.1002/9781119013068.ch1.