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With distributed sources along a helix trajectory, the helical interlaced source detector array (HISDA) requires no rotation while scanning, thus improving temporal resolution and ensuring mechanical stability. However, in this system, gaps exist in the detector array where sources are placed, resulting in the non-measurement of projection data in gaps. To solve this problem, we propose the semi-stationary...
This research involved a 3D simulation of a non-destructive test by detecting fluorescence X-ray with a position sensitive CdTe detector. Simulations proceeded in various conditions such as different types of phantoms. All simulations were based on fluorescence X-ray computed tomography (FXCT) by using the Monte Carlo method. In general, conventional Computed Tomography (CT) analyzes materials based...
This research features a new idea for effective sinogram inpainting that boosts the MAR (metal artifacts reduction) performance. We have indentified neighbor pixels that are relevant to the target pixel to be inpainted and only used these pixels in determining an inpainting value. Experimental results show that our methods based on the proposed idea significantly reduce inpainting errors, enhancing...
This paper presents a helical interlaced-source-detector-array (HISDA) CT approach for superior temporal resolution. A Feldkamp-type algorithm is first proposed for HISDA CT reconstruction. Then, schemes for recovering missing projection data are studied. The performance of HISDA CT is evaluated in the numerical simulation, which is better than the previously proposed circular interlaced-source-detector-array...
This paper presents a preliminary study of multi-modules of x-ray array detectors coated with x-ray phosphor. The multi-modules of array detectors were designed and constructed to improve the field of view of x-ray array detectors and further apply to a mini-CT scanner. Each module is comprised of 64 phototransistors connected to detector front-end, data acquisition system, and control unit, respectively...
In this paper, the indirect X-ray-detector panel using an array of digital camera with an intensifying screen is designed. To assist the orientation process, the camera calibration was used to derive the information of how the individual camera is oriented. Salt & pepper noise was removed by the median filtering technique. The border of captured image was transformed and registered by using the...
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