Affiliations: The Key Lab of Optoelectronic Technology and System of
the Education Ministry of China, Chongqing University, Chongqing, China | Biomedical Imaging Division, VT-WFU School of
Biomedical Engineering and Sciences, Virginia Technology, Blacksburg, VA,
USA | Department of Radiology, Division of Radiologic
Sciences, Wake Forest University Health Sciences, Winston-Salem, NC, USA | Biomedical Imaging Division, VT-WFU School of
Biomedical Engineering and Sciences, Wake Forest University Health Sciences,
Winston-Salem, NC, USA | Department of Mathematics and Statistics, University
of Canterbury, Private Bag, Christchurch, New Zealand | Department of Radiology, University of Otago,
Christchurch, New Zealand | Department of Physics and Astronomy, University of
Canterbury, Private Bag, Christchurch, New Zealand
Abstract: The Medipix All Resolution System (MARS) system is a commercial
spectral/multi-energy micro-CT scanner designed and assembled by the MARS
Bioimaging, Ltd. in New Zealand. This system utilizes the state-of-the-art
Medipix photon-counting, energy-discriminating detector technology developed by
a collaboration at European Organization for Nuclear Research (CERN). In this
paper, we report our preliminary experimental results using this system,
including geometrical alignment, photon energy characterization, protocol
optimization, and spectral image reconstruction. We produced our scan datasets
with a multi-material phantom, and then applied ordered subset-simultaneous
algebraic reconstruction technique (OS-SART) to reconstruct images in different
energy ranges and principal component analysis (PCA) to evaluate spectral
deviation among the energy ranges.
