A Novel Stationary CT Scheme Based on High-Density X-Ray Sources Device

A Novel Stationary CT Scheme Based on High-Density X-Ray Sources Device

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With the introduction of cold electron sources such as football sleds for turf nanotubes, X-ray sources became small in size so that many sources are installed in array to form stationary CT, which brings benefits of simplicity in mechanism and fast response.However, the nanotube-based X-ray source is still singly packaged and hence density of X-ray sources is limited, which introduces severe sparse-view artifacts and could not be used in practice.With the invention of X-ray sources device based on ZnO nanowires as cold electron emitters, a large amount of X-ray sources is first integrated in a flat panel device.

In this study, we design a stationary CT architecture using high-density sources devices, called HD-SCT, and develop corresponding reconstruction algorithm.Specifically, several flat panel detectors and X-ray sources devices are spliced together to form a source-detector plate.Multiple source-detector plates are organized as a polygon that encloses object to complete CT scanning.

In HD-SCT, X-ray sources are close to object which can significantly decrease CT device volume.The X-ray beam emitted by each source just cover part of object and the spot sources alternately light to completely scan object.Simultaneously, we propose a reconstruction method for the specific configuration which adopts an iterative algorithm to resolve the reconstruction based on alterative part projections, as well as a novel correction process of projection completion for the shadowed area of placing X-ray source devices.

To validate the design graco ascent of the proposed HD-SCT, we execute a series of simulation experiments, which show that the proposed HD-SCT and corresponding reconstruction method effectively remove the artifacts caused by the embed X-ray source device.The results also disclose that with the increase of density of X-ray sources, the resolution of reconstruction has been dramatically improved, which demonstrates the practical value of introducing high-density X-ray sources device into stationary CT design.