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Table 2 Terms that are associated with the micro-CT images, and their definitions

From: Micro-CT – a digital 3D microstructural voyage into scaffolds: a systematic review of the reported methods and results

Term Definition
Pixel size Size of the 2D discrete parts that make up a 2D micro-CT image. Usually, expressed as a single value, e.g., 10 μm, indicating the size of each pixel is 10 μm × 10 μm.
Voxel size The 3D equivalent of pixel size indicates the size of each voxel, Typically, micro-CT images isotropic (identical size in all dimensions), e.g., 10 μm × 10 μm × 10 μm, in which case pixel size and voxel size provide identical information.
Resolution ▪ Smallest perceptible detail (complete and exact definition can be found in Ref. [164])
▪ Resolution of an image can indicate the number of pixels in an image (such as 800 × 600). The second definition is referred to the display matrix size in the standard guide of ASTM International: E1441-11.
Spatial resolution ▪ Smallest displacement that can be measured in the measurement direction [164]
▪ Smallest separation where two points can be identified as separate parts (complete and exact definition can be found in the standard guide of ASTM International: E1441-11)