X-ray Computed Tomography measurements

Our junior research scientist, Marc de Beurs, has established to do some interesting X-ray measurements. An X-ray Computed Tomography (CT) gives a cross-sectional image of a measured sample. Through this technique get so called virtual slices of the object are obtained, giving full 3D information.

RJ45

Here we see a CT reconstruction of the RJ45 connector, more knows as the ethernet connector.
Every virtual slice is stacked after one another and shown as a movie. In this manner the connector is seen from bottom to top, where the next slice has a rise of 55 micron. For clarification a 2D X-ray image of the connector is shown, where the yellow line indicates the slice that is shown in the reconstruction.

The RJ45 ethernet connector.

The RJ45 ethernet connector.


See this video on YouTube

Visible features:

The white round shaped objects are the cables and the lighter square is the plastic material around the connector.
Interesting is when the cables start to cross. On the 2D image this is also visible, however one cannot determine what the distances are between these cables or which one crosses in front. By looking at the CT reconstruction this information is achieved.
At the end of the movie even the small plastic part, corresponding the the clip, is visible.

Technical details:
  • Measurements of 180 degrees rotation with steps of 1 degree.
  • Each frame has an exposure time of 0.1 second coming to a total exposure time of 18 seconds.
  • For these measurements an X-ray beam with Tungsten as the target material has been used, with the voltage set to 50 kV and the current at 0.7 mA.

Chicken heart

The RJ45 is a good example of what can be established with our detector. For a more biological application Marc de Beurs made a CT scan of a chicken heart filled with iodine to see where the limits of distinction of our detector are.

The chicken heart filled with iodine.

Chicken heart filled with iodine.



See this video on YouTube

 

CT image of the chicken heart.

CT image of the chicken heart.

Visible features:

The light circle in the top right is the artery filled with iodine, the darker circle around is the plastic which is filled with iodine. The dark area (blob situated on the right low centre) is air (the heart is opening up) the light area (biggest area, everywhere) is the mussel, and the slightly darker area (also big) is fat.

Technical details:
  • Measurements of 180 degrees rotation with steps of 1 degree.
  • Each frame has an exposure time of 2.0 seconds.
  • For these measurements an X-ray beam with Tungsten as the target material has been used, with the voltage set to 50 kV and the current at 0.3 mA.

To be able to identify all these different materials, with high resolution is what we stand for.