Understanding k-space: A foundational MRI physics refresher

This MRI physics primer explains that k-space is the raw data matrix from which MR images are reconstructed via Fourier transform, not a direct image. It covers how each point encodes spatial frequency and contrast, demystifying a concept critical for understanding artifacts and…

• k-space is a conceptual grid holding raw MRI data before reconstruction; its center encodes image contrast, while the periphery encodes spatial resolution.
• The tutorial is part of the 'Questions and Answers in MRI' series by Dr. Elster, aimed at radiology trainees and physicists.
• The source is a well-established online educational resource, not a peer-reviewed study, and presents foundational physics without new experimental data.

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