Abstract
Magnetic resonance imaging (MRI) is based on magnetic excitation of body tissue and the reception of returned electromagnetic signals from the body. Excitation induces phase-locked precession of protons with a frequency proportional to the strength of the surrounding magnetic field as described by the Larmor equation. This fact can be exploited for spatial encoding by applying magnetic field gradients along spatial dimensions on top of the strong static magnetic field of the scanner. The obtained frequency-encoded information for each slice is accumulated in two-dimensional κ space which can be transformed into image space by Fourier analysis.
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Goebel, R. (2007). Localization of Brain Activity using Functional Magnetic Resonance Imaging. In: Stippich, C. (eds) Clinical Functional MRI. Medical Radiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-49976-3_2
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