A real number is a component of a complex number. In CT, complex data are used for example in the Fourier transforms.

Reconstruction is the mathematical process by which the displayed image is produced from the raw data.
Used equipment and data processing methods to reconstruct CT images:
See also Zoom Reconstruction, Reconstruction Matrix and Multiplanar Reconstruction.

(RFOV) The reconstruction field of view is the size of the scan field of view (SFOV) that is reconstructed to form a CT image.

The reconstruction matrix is the array of rows and columns of pixels in the reconstructed image.

Reflux is the backward flow of fluids.