• Solid phase
• Maximum dimension (x, y, or z): 10 mm (larger samples can impede resolution)
• Plate-like or discus sample geometries can also limit resolution

Micro- X-ray Computed Tomography works on the same premise as computed tomography scans in medicine (more commonly called “CT Scans” or “CAT Scans”), but on much smaller analytical volumes.

Tomography encompasses the reconstruction of a 3D model from serial cross-sectional images. In Micro-CT, these cross sections are generated from transmitted X-rays which pass through the sample to reach a 2D area detector.

The system records the intensity of x-ray signal at each pixel in a sensor array, forming a 2D planar projection of the sample’s relative density and material matrix. The resolution and sensitivity of this technique is critically dependent on the detection system and the nature of the sample determines the x-ray beam energy needed. The sample stage is rotated between measurements to produce a series of radial cross sections which the Micro-CT then assembles into a 3D model which can then be quantitatively measured to analyze critical dimensions of surface and subsurface components.

The 3D model contains the full data set of all measurable points within the probed volume, and can be explored virtually to characterize the spatial relations of various features in the sample, to extract 2D images at specific positions and angles, to find hidden differences between seemingly identical samples, and to calculate porosity and other properties: all without damaging or contacting the original sample.