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Effect of the X-ray shooting angles for 2-D images on CT images
Tao Quang Bang(다어 광 팡),Daniel Vavrik,Insu Jeon(전인수) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this paper, a new method for the exact reconstruction of any gray-scale image from its projections is proposed. The original X-ray image is projected into several view shooting angles and then 2-D images will be reconstructed to CT images using Matlab software. The main aim of this study was to evaluate the effect of the X-ray shooting angles for 2-D images on CT images and another objective of this study was to obtain 2D X-ray images of CT reconstruction with ordered subsets expectation-maximization (OSEM) method.
Tao Quang Bang,Insu Jeon 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
X-ray Computer tomography (CT) has provided a unique window into the anatomy of the human body since the invention of the CT scanner by Hounsfield in 1972. Nowadays, X-ray CT is widely used in many applications, can reconstruct the cross-section of object from its projections, not only a well-recognized imaging modality in medicine but also an essential one in industrial quality control and nondestructive evaluation. However, present CT techniques only consider increase the quality of CT images so a huge number of X-ray projections are needed as well as increase radiation dose and X-ray taking time for patient. To solve these problems, we developed image interpolation technique to reconstruction image from limited X-ray projections. The advantage of this technique was to decreased radiation dose and X-ray taking time for patient as minimal as possible, while increase the quality of CT images. In this study, we applied our method to biomaterial and aluminum phantom
Interpolation technique for CT reconstruction
Tao Quang Bang,Insu Jeon(전인수) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.5
X-ray computed tomography (CT) is a well established visualization technique in medicine and nondestructive testing. However, since CT scanning requires sampling of radiographic projections from different viewing angles, common CT systems with mechanically moving parts are too slow for dynamic imaging, for instance of multiphase flows or live animals. Projections are acquired electronically using a linear array of solid-state detectors and an X-ray source that rotates around the patient. Therefore, decrease number of X-ray projections in X-ray CT reconstruction process to obtain reasonable CT images is very challenging. In this study, we present a linear interpolation technique for tomographic reconstruction of a sample from vastly fewer angular projections than required by conventional algorithms. In this research, we present reconstructions from an experimental X-ray CT scan of a phantom that follows to two steps: X-ray images will be interpolated and using it for CT reconstruction based upon Ordered Subsets Expectation Maximization (OSEM) method.
Experimental study on mechanical behaviors of injection molded PC/PMMA blends
Van Thanh Hoang,Quang Bang Tao,Bich-Tram Truong-Le,Minh Sang Tran,Duc Binh Luu 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.9
Mechanical property is one of the quite important factors of optical articles. Most of pure plastics materials are rarely found to have both high strength and toughness. The paper aims to investigate mechanical properties of polymethyl methacrylate and polycarbonate (PC/PMMA) blends by means of injection molding process and optimization technique. In this study, four factors including composition, packing pressure, melt temperature, and cooling time are taken into account. Experimental results show that the composition is found as the most significant factor for improving the mechanical properties of PC/PMMA blends with confidence level of 95 %. Meanwhile, melt temperature and cooling time are also the most significant parameters for enhancing impact strength with 95 % confidence level. In addition, the mechanical properties of the PC/PMMA plastics composites have been enhanced significantly. Specifically, average tensile yield strength, impact strength, and average elongation are 76.5 MPa, 7429.5 J/m 2 , and 17.5 mm, respectively.
Evaluation of temperature on different wheelchair cushions using infrared thermography method
He Thong Bui,Quang Bang Tao,Philippe Lestriez,Karl Debray,Redha Taiar,Van-Thanh Hoang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.3
Newly developed wheelchair cushions, nowadays, promise to offer more comfort and protection against injury for wheelchair users. Therefore, developing novel wheelchair cushions has become a real challenge for manufacturers in recent years. In particular, thermal properties of the wheelchair cushion and their effect on the user’s comfort are very important factors in the design and optimization. This paper reports the findings of an investigation into the thermal properties of wheelchair cushions using an infrared thermography system. The experimental results showed a variation in the temperature behavior of different trademarks of cushions depending on the heating zones and the C1 cushion made in TPU material has more advantages than the other cushions made in PU foam, pharmform, and visco-foam. The results and analysis from this research will help to find a better type of cushion and contribute to collecting useful medical information to prevent pressure ulcers for bedridden patients.