X-ray imaging

X-ray Tomography

X-ray imaging is the primary application of our devices. Our hybrid pixel detectors are single-photon-counting devices. It means that only signals generated by X-rays are detected. Contrary to regular X-ray digital imaging sensors (CCDs, flat panels) there is no dark current integrated. Therefore, the dynamic range achievable in X-ray images taken with our LynX and Cheetah detectors is virtually unlimited.

Our devices can also create color images such as the right figure of a Spinach seed.

Fig left: CT reconstruction of a mouse measured using LynX 120, with Timepix overall measurement time ~17 minutes, 100 projections. Reconstruction done with our Sophy software.


Color X-ray Imaging

A major advantage of color resolving X-ray Imaging, compared to regular X-ray imaging systems, is the capability to discriminate energy of detected X-rays. This opens the possibility to even recognize different materials in X-ray images. Three or more images are measured at different energy discrimination thresholds. The images are then analyzed using our software tools and color image is created. Colors in the image represent different elements in the sample. Color X-ray image of different painting pigments is used as an example:
Photo of pigment stripes and grains. From left: Au for gilding and paints containing Cd, Cr, Cu, Pb and Co.¹
Regular X-ray image
This sample shows color X-ray image of different painting pigments
Our hardware and software also allows 3D material recognition. The next image shows visualization of a 3D reconstructed volume. Various colors are representing different materials of the sample. The test sample consisted of overlapping foils of different metals (Ni, Cu, Ag and Sn). The foils were 25 µm thick. The CT projections were measured at three different energy thresholds and the RGB components of colors in the reconstructed volume were mapped to each energy threshold.

Color CT of a USB memory stick: measured with LynX 120 detector, 40 projections, X-ray tube running at 50kVp@100µA.