What is the name of the domain where phase encoding data is stored?

K-Space is the correct term used to describe the domain where phase encoding data is stored in magnetic resonance imaging (MRI). K-space represents a matrix that contains information about the spatial frequencies of the image being acquired. Each point in K-space corresponds to a specific frequency and position within the image, capturing how various spatial frequencies contribute to the overall image.

During the MRI scanning process, data is collected in this K-space rather than in the final image space. The phase encoding, in conjunction with frequency encoding, allows for the reconstruction of the image through algorithms that interpret the data held within K-space. Once the data is processed and transformed (typically using an inverse Fourier transform), it is converted into the final image that is displayed for analysis.

In contrast, the frequency domain and spatial domain refer to other contexts in imaging and signal processing. For example, the frequency domain relates to representations based on frequency components, while the spatial domain refers to the actual dimensions and pixel representations of an image. Resolution space is not a standard term used in MRI, making it less relevant in this context. Thus, K-Space is the definitive term that accurately describes where phase encoding data resides in the MRI process.