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  6. What is Neutron Imaging ?
  7. Neutron Imaging Techniques and Methods
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Neutron Imaging and Applied Materials

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Neutron Tomography

Figure 10: Experimental setup for neutron tomography at NEUTRA
Figure 10: Experimental setup for neutron tomography at NEUTRA
Figure 11: Tomography data acquisition
Figure 11: Tomography data acquisition
Figure 12: Computer tomography reconstruction
Figure 12: Computer tomography reconstruction
Computed tomography is a method to acquire three dimensional information about the structure inside a sample. The method applies to neutron as well as the more known X-ray imaging. It uses radiographic projection images from many views to reconstruct the distribution of materials in the sample. Mostly, the projections are acquired with equiangular steps over either 180o or 360o to cover the whole sample. Figure 9 shows an experiment setup used for neutron tomography (NT). In contrast to medical imaging the samples is rotated instead of the beamline. The projection images are acquired using a combination of a scintillator to convert the neutrons to visible light and a CCD camera. The transform of the projection data into a three dimensional image is a computationally intensive task handled by special reconstruction software. During the reconstruction process, slices perpendicular to the rotation axis are produced. When these slices are stacked in a sequence they form a three-dimensional volume image of the sample. The reconstructed volume data can be visualized using three-dimensional rendering graphics software. Using such tools, regions can be segmented based on their attenuation coefficients and geometry. This can be used to reveal details inside the sample in three dimensions.

Figure 13: Visualization of 3D neutron tomography data of a horseflyzoom
Figure 13: Visualization of 3D neutron tomography data of a horsefly

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Applied Materials Group
Paul Scherrer Institut
LNS WBBA/118
5232 Villigen PSI

Prof. Dr. Markus Strobl
Group leader

Phone: +41 56 310 5941
E-mail: markus.strobl@psi.ch

Secretary: R. Bercher
Phone: +41 56 310 3402
Fax: +41 56 310 3131
E-mail: renate.bercher@psi.ch
 

Additional Information

  • Research with neutrons, synchrotron light and muons
    More about the most important tools in PSI's research on the structure of matter.
  • Research with PSI's large-scale facilities
    The institute's main experimental facilities
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