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Kim J.-H.,NanoFocusRay Co.
2013 44th International Symposium on Robotics, ISR 2013 | Year: 2013

At present, microrobots have been utilized as useful tools in diagnosis and treatment of various human diseases. As a new alternative for Chronic total occlusion (CTO), researchers are developing a intravascular therapeutic microrobot system by controlling the movement of the microrobot outside the patient's body, and using an electromagnetic actuation (EMA) system to increase the accuracy of therapy. We proposed a new bi-plane x-ray imaging system for real-time position tracking of intravascular microrobot. This system are consisted three device, up to 110kVp, 10mA x-ray mono-block tube, 1.1kW x-ray generator and 24×30cm x-ray flat panel detector. Bi-plane X-ray imaging system resolution is 200um and fluoroscopic dose rate is 46mGy/min. © 2013 IEEE.

Cha B.K.,Advanced Medical Device Research Center | Lee D.H.,Advanced Medical Device Research Center | Kim B.,Advanced Medical Device Research Center | Seo C.-W.,Advanced Medical Device Research Center | And 3 more authors.
Journal of the Korean Physical Society | Year: 2011

We introduce the development of pixel-structured screens with a thallium-doped CsI (CsI:Tl) scintillator for indirect digital X-ray imaging sensors. The indirect-conversion detection method based on the pixel-structured CsI:Tl scintillator provides high spatial resolution X-ray imaging without sacrificing the light spread in thick scintillation layers. The scintillation screens were fabricated by using a vacuum deposition process and filling the CsI:Tl scintillating powders into a two-dimensional pixel-structured silicon array. Pixel structures with 100 μm and 50 μm pixel sizes with wall widths of 20 μm and 200 μm thickness were prepared and the fabricated CsI:Tl scintillating powders were filled into the trench of the pixel structure through a vacuum process. The final scintillation screens with 2.5 cm × 2.5 cm size were prepared and directly coupled to a CCD image sensor with an optical lens for performance evaluation of X-ray imaging. The imaging performance of the samples was investigated in terms of the relative light intensity, the X-ray linearity and the spatial resolution under practical X-ray exposure conditions. These preliminary results imply that pixel-structured CsI:Tl scintillating screens show high spatial resolution by less lateral spread of the emitted visible photons within pixel-structured silicon arrays. However, these X-ray detectors still require improved X-ray sensitivity by coating the reflective layer onto an inner silicon wall surface and filling the scintillating power into pixel structures completely.

Park M.,KAIST | Lee H.-S.,Nanofocusray Co. | Kim K.-W.,Nanofocusray Co. | Cho S.,KAIST
IEEE Nuclear Science Symposium Conference Record | Year: 2013

Cone-beam computed tomography (CBCT) imaging system has been widely used in various applications, and takes an important role for diagnosis of emergency patient. However large size of detector causes high scatter-to-primary ratios on CBCT projection data. Also, beam hardening artifacts in reconstructed CT images is resulted by the polychromatic spectrum of X-ray beam. These two phenomena lead to unwanted results of reconstructed image such as cupping artifact, worsen soft tissue contrast, and lower CT grey value. This paper studies the result of investigation into the effect of the scatter kernel superposition (SKS) method and polynomial beam hardening correction on the measurement soft tissue contrast of head phantom for reconstructed data from half-fan CBCT system. The measurement imaging system was PHION, which is mobile CT system of NanoFocusRay Co., Ltd, and PH-3 angiographic CT head phantom ACS was used for experiments at 120 kVp and 15 mAs. The data was processed by scatter correction and beam hardening correction which is a linearization method based on polynomial curves of second order. The image was reconstructed using a filtered back projection algorithm. After scatter and beam hardening correction, contrast to noise ratio of reconstructed images is increased and soft tissues are seen more clearly. Image with scatter correction and beam hardening correction has clear boundary between skull and soft tissues, but only scatter corrected image has unclear boundary. © 2013 IEEE.

Kim K.-W.,Nanofocusray Co. | Kim K.-G.,Nanofocusray Co. | Kim J.-H.,Nanofocusray Co. | Min J.-H.,Nanofocusray Co. | And 2 more authors.
3D Research | Year: 2011

A high resolution micro computed tomography (micro-CT) system for live small animal imaging has been developed. The system consists of an x-ray source with micro focus spot and high brightness, rotating gantry with a x-ray tube and flat panel detector pair and a stationary and a horizontally positioned small animal bed to achieve a conebeam mode scan. The system is optimized for in vivo small animal imaging and the capability of administering respiratory anesthesia during scanning. The Feldkamp algorithm was adopted in image reconstruction with graphic processing unit (GPU). We evaluated the spatial resolution, image contrast, and uniformity of system using phantom. As the result, the spatial resolution of the system was the 56lp/mm at 10% of the MTF curve, and the radiation dose to the sample was 98mGy. The minimal resolving contrast was found to be less than 46 CT numbers on low-contrast phantom. We present the image test results of the bone and lung, and heart of the live mice. © 2011 3D Display Research Center and Springer-Verlag Berlin Heidelberg.

Nanofocusray Co. | Date: 2013-10-01

Provided is an X-ray image photographing device, and more particularly, a portable X-ray image system available for multiple uses. In addition, disclosed is an X-ray image photographing device, and more particularly, an operating table which may be coupled to a portable X-ray image device.

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