Abstract
ABSTRACT With the final aim of achieving iodine contrast-enhanced cancer screening examinations with low dose exposure, we reconstructed tomographic images of material distributions from X-ray transmission measurements obtained from a small number of measurement directions. This method used a planar-type four-channel ‘transXend’ detector. The phantom was subjected to four different X-ray spectra tailored by filters, and the X-rays were measured by a flat panel detector. The X-ray attenuation by the phantom was reproduced according to attenuations by acrylic, iodine, and aluminum, which acted as substitutes for normal tissue, iodine contrast agent, and bone, respectively. The material thickness distributions obtained were used for tomographic image reconstruction of the material distribution. The quality of iodine tomographic images is discussed as a function of the number of measurement directions.
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