K-space can refer to: Another name for the spatial frequency domain of a spatial Fourier transform Reciprocal space, containing the reciprocal lattice of a spatial lattice Momentum space, or wavevector space, the vector space of possible values of momentum for a particle k-space (magnetic resonance imaging) Another name for a compactly generated space in topology K-space (functional analysis) is an F-space such that every twisted sum by the real line splits K-Space (band), a British-Siberian music ensemble