Next generation luggage screening will rely on the use of
energy dispersive x-ray detectors. These sensors catch photons with energies between 20-160keV and are
able to characterize each individual photon for an unprecedented amount of data
available for subsequent imaging analysis.
The drawback of these detectors is a significantly higher
complexity level in the signal interpretation. The common post-processing steps
have to be enhanced and renewed. Even as these methods are being developed we
still see artefacts in when the data is transformed into material specific 3
dimensional maps of the luggage. The aim of this project is specifically to
analyze and understand the mechanisms of one of these artefacts. If we can
successfully construct a model that cause the artefact the student will be
charged with developing a suitable algorithm and extend the current post
processing work flow with a fast and efficient implementation of the algorithm.
the physical interactions that takes place in the data acquisition path from
the photons exits the source to the detector signal is registered and to
understand the analysis process during post-processing and subsequent 3D
register occurrence and severity of ring artefacts for a range of samples and
and algorithms to diminish or eliminate ring artefacts. The task can be
extended to make an efficient implementation of the methods in the existing
post processing flow.
After the project the successful student will
- A basic knowledge of how
semiconductor physics influence detector devices
- Understood how to use a physical
model in practical data analysis
Introduction to CT reconstruction
Knowledge of X-rays, Material Science and/or mathematical reconstruction. Knowledge of basic programming such as MatLab.