A voxel (short for "volume element") is the fundamental unit of a three-dimensional (3D) image, serving as the 3D equivalent of a pixel in a 2D image.
In X-ray Computed Tomography (CT), the scanned object is reconstructed as a grid of voxels. Each voxel holds a specific value (CT value or gray value) representing the average X-ray absorption (attenuation coefficient) of the material within that tiny cubic volume.
Key characteristics:
- Resolution: The size of the voxel directly impacts the spatial resolution of the CT data. Smaller voxels allow for the visualization of finer internal details and microscopic defects.
- Data Analysis: Voxel data is essential for volume rendering, defect analysis, and dimensional measurements in non-destructive testing (NDT).
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