High energy, high resolution monochromatic x-ray computed tomography system

Y. Nagata, H. Yamaji, K. Hayashi, K. Kawashima, K. Hyodo, H. Kawata, M. Ando
1992 Research in nondestructive evaluation (Print)  
The limits of mammography have led to an increasing interest on possible alternatives such as the breast Computed Tomography (bCT). The common goal of all X-ray imaging techniques is to achieve the optimal contrast resolution, measured through the Contrast to Noise Ratio (CNR), while minimizing the radiological risks, quantified by the dose. Both dose and CNR depend on the energy and the intensity of the X-rays employed for the specific imaging technique. Some attempts to determine an optimal
more » ... ermine an optimal energy for bCT have suggested the range 22 keV-34 keV, some others instead suggested the range 50 keV-60 keV depending on the parameters considered in the study. Recent experimental works, based on the use of monochromatic radiation and breast specimens, show that energies around 32 keV give better image quality respect to setups based on higher energies. In this paper we report a systematic study aiming at defining the range of energies that maximizes the CNR at fixed dose in bCT. The study evaluates several compositions and diameters of the breast and includes various reconstruction algorithms as well as different dose levels. The results show that a good compromise between CNR and dose is obtained using energies around 28 keV. www.nature.com/scientificreports www.nature.com/scientificreports/ several works 36-44 and makes use of the normalized glandular dose coefficient (DgN), which is a function of the spectrum of the beam, the composition and the size of the compressed breast: Scientific RepoRtS | (2019) 9:13135 | https://doi.
doi:10.1007/bf01625876 fatcat:y6xjia5na5bhtfr2pk2ah3t7ty