X-Ray Tomography

X-RAY TOMOGRAPHY

X-ray computed tomography (XCT) is a non-destructive method of examining the internal structure of components.

NSI ImagiX CT Scanner

The ImagiX is equipped with an X-ray tube containing a tungsten target. The X-ray tube is capable to operate up to 150kV tube voltage, with various spot sizes:-

-  Small spot size: 5μm up to 4W, 7μm between 4 and 10W

-  Medium spot size: 20μm up to 30W

-  Large spot size: 50μm up to 75W

The detector is of the indirect conversion flat panel type. It has a pixel matrix of 1024 x 1024 with a pitch of 127µm.

Achievable isotropic voxel size depends on both the X-ray tube spot size and magnification, thereby the sample size. The smallest achievable isotropic voxel size is ~4.9µm, for samples under ~5mm in diameter.

It is possible to perform VorteX (helical) scan for long and thin objects (~100mm) to achieve a reasonably small voxel size.

The projection data can then be reconstructed, based on the Feldkamp algorithm, and visualised using efX-ct software (version 1.7.397.29, North Star Imaging Inc., Minnesota, USA). The reconstructed dataset can be viewed and further analysed using established commercial software such as VG Studio and Amira-Avizo, or open source software such as ImageJ. The dataset can be viewed as an executable file without the need of NSI software installation. In addition 2D CT reconstruction slices, videos and snapshots can be exported.

Equipment funding was provided by EPSRC Grant EP/J013501/1.

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