Zooming increases scale factors of images within a window. Zooming takes a selected region and extends it over the entire matrix of the displayed CT image. Usually, a zoom reconstruction increases the accuracy of the CT numbers by decreasing the overall size of the displayed image pixels, which decreases the possibility of many tissues occupying a single pixel (partial volume averaging).
Zooming or targeting is not the same as image magnification.

See also Banding.

Banding is a set of functions performed by placing and dragging the mouse pointer on an image. For example, the zooming of images by placing the mouse pointer on an image, pressing and holding the mouse button, dragging a box around the area of interest, and releasing the mouse button to zoom. Other banding operations include panning and zooming.

A matrix is an array of numbers in rows and columns. The horizontal lines in matrices are called rows and the vertical lines are called columns. A matrix with m rows and n columns is called an m-by-n matrix (or mxn matrix) and m and n are called its dimensions. The matrix used in computed tomography determines the scan resolution.
Matrices are useful to record data that depend on two categories, and to keep track of the coefficients of systems of linear equations and linear transformations.

See also Image Resolution and Zooming.

A zoom reconstruction is the enlarged reconstruction of a part of an image. A zoom reconstruction uses the raw data of a scan. Zooming or targeting requires the operator to manipulate the displayed field of view.