The CT process involves several steps:
Micro- and nano-CT scanners produce 2D representations of a slice of an object based on material density, measured by X-ray transmissions.
The resulting slice is made up of 3D pixels, known as ‘voxels’. Each voxel is assigned a CT (grey) value derived from a linear attenuation coefficient that relates to the density of the materials being scanned.
Since a CT scan is a mathematical representation of an object rather than a true image, it is suited to quantitative analysis of structure and geometry.
The resolution of a scan is largely determined by the size of the voxels. It is in the order of: