Figure 3.

(a) Schematic representation of missing plane information at point x_o. Shaded area indicates the region of missing planes with normal vectors restricted to the y–z plane for simplicity. An example of a nonmeasurable plane is indicated by the dashed line. (b) Missing plane information results in unmeasured lines of spatial frequencies that fill a cone in the local Fourier domain as illustrated where k_o corresponds to the DC (zeroth frequency) component. The minimum, η₁ and maximum, η₂, internal angles of the missing cone are shown in (a) as they relate to the x-ray cone angle, α, at source position ν(ϕ), where ϕ is the transverse angle in degrees, measured counterclockwise from the x axis.