Low-dose single-energy material decomposition in radiography using a sparse-view computed tomography scan

AbstractDual-energy material decomposition (DEMD) is a well-established theoretical x-ray technique that uses low- and high-kilovoltage radiographs to separate soft tissue and bone in radiographyand computed tomography (CT). However, it requires double exposures that result in increased patient radiation doses, causes increases in the execution time, and generates errorsdue to misregistration attributed to the patient motion between two scans. In this study, we investigated a low-dose, single-energy material decomposition (LSEMD) method in radiographyusing a sparse-view CT scan where the attenuation lengthin the object was estimated from the CT image. We performed a systematic simulation and an experiment to demonstrate the feasibility of use of the LSEMD method in radiography. Only 60 projections, far fewer than those required by the Nyquist sampling theory, were acquired at an x-ray tubevoltage of 80 kVp, and were used to reconstruct a sparse-view CT image with a state-of-the-art dictionary-learnin...