Incoherent-scatter computed tomography with monochromatic synchrotron X-ray

We describe a new system of incoherent scatter computed tomography (ISCT) applied to in vivo imaging, and the reconstruction method for ISCT using the least squares method with singular value decomposition. The system operates on the basis of computed tomography (CT) of first generation. The preliminary experiment was carried out at the BLNE-5A bending magnet beam line of the Tristan Accumulation Ring in KEK, Japan. An acrylic cylinder of 20 mm diameter with a cross-shaped channel was imaged. The channel was filled with a diluted iodine solution of 200 μg/ml. The detective system with a high purity germanium (HPGe) detector separated incoherent X-ray peak from other remarkable peaks, i.e., K_α and K_β, X-ray fluorescent lines and coherent scattering peak. CT image was reconstructed from projections generated by integrating the counts in the energy window centered to the incoherent scattering peak with approximately 2 keV width