In k-space, which lines contain the majority of SNR information?

In k-space, the central lines contain the majority of the signal-to-noise ratio (SNR) information. This is because the central region of k-space corresponds to low-frequency information, which is primarily responsible for the overall contrast and structure of the image.

When acquiring images using techniques like MRI, data is collected in the k-space domain, and each line in k-space represents different spatial frequencies of the image. The central lines typically represent the low-frequency components that encompass the bulk of the image information, contributing significantly to image quality. In contrast, the outer lines represent higher spatial frequencies that contribute detail and sharpness but do not significantly enhance the SNR.

Thus, for optimal image quality and clarity, focusing on the central lines in k-space is essential, as they provide the foundational SNR required to create a well-defined image.