Optimization of X-ray Source for Digital Mammography - X-ray Optics Approach
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
The work presents a new design of X-ray source for digital mammography imaging with the help of crystal sources and X-ray optics technology.
The aim of the project was to introduce a new source for medical x ray imaging and evaluate its ability of performance.
The source is build of an array of multiple micro-emitters instead of a single source. These sources are made of pyroelectric crystals. The produced Xrays are then getting focused by passing through prism array lenses. These lenses are used as focusing pre-object collimator, to reduces the divergence of the beam and increases the utilization of the available X-rays. The lenses are coupled with collimators to avoid scatter rays.
The software used for the simulations of the system and evaluations is MATLAB. Several methods, like calculating the point spread function and modulation transfer function, have been applied in order to evaluate the system imaging ability and the system efficiency. Later on in calculations, an anti scatter grid is added as a post collimator and system efficiency is calculated again before and after the grid.
The ability of the system to perform is calculated for digital mammography. The results in the end showed how the lenses perform while using different photon energies. However the current results were not enough to approve the ability of the system for medical imaging uses. For achieving more comprehensive and certain answers further investigations will be necessary.
Place, publisher, year, edition, pages
2012. , 30 p.
IdentifiersURN: urn:nbn:se:liu:diva-84857ISRN: LiTH-IMT/MASTER-EX--12/016--SEOAI: oai:DiVA.org:liu-84857DiVA: diva2:562593
kungliga Tekniska Högskolan
Subject / course
Master's Program Biomedical Engineering
2012-06-14, IMT1, Linköping, 13:00 (English)
Nillius, Peter, PhD
Sandborg, Michael, Prof