SEMINARIESCHEMA FÖR MATEMATISK STATISTIK 

Onsdag    29/5  13.15         Rebecka Jörnsten
          1996                Matematisk statistik, Lund,
                              presenterar sitt examensarbete:

                              Subpixel resolution in PIXE-images.
                              Implementation of a Deblurring algorithm
                              using Simulated Annealing.


Abstract:

PIXE (Proton Induced X-ray Emission) is nuclear imaging method for
studies of the elemental composition of samples. As a beam of high-energy
particles is moved across the sample, the amount of induced radiation
from each target area will be measured. These measured quantities are
proportional to the number of atoms in the target areas. Obviously, the
resolution of the PIXE method is determined by the beam
diameter. Today, although the beam can be focused to micrometer
diameters the resolution is still too coarse to be used succesfully on
certain medical samples. By moving the beam to overlapping positions,
a process often refered to as blurring, we aim to improve on the
resolution determined by the beam diameter. A stochastic model for the
imaging method was constructed and a deblurring algorithm was
implemented approximately using simulated annealing.




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