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- 저자 : 전계석(Kyu Suk Jun) (검색결과 6 건)
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3D 동영상획득을 위한 Cone-Beam 형 X-Ray CT 시스템 구현에 관한 연구
정찬웅,전계석,Jeong, Chan-Woong,Jun, Kyu-Suk 한국음향학회 2009 韓國音響學會誌 Vol.28 No.4
In this paper, we presents a new cone beam computerized tomography (CB CT) system for the reconstruction of 3 dimensional dynamic images. The system using cone beam has less the exposure of radioactivity than fan beam, relatively. In the system, the reconstruction 3-D image is reconstructed with the radiation angle of X-ray in the image processing unit and transmitted to the monitor. And in the image processing unit, the Three Pass Shear Matrices, a kind of Rotation-based method, is applied to reconstruct 3D image because it has less transcendental functions than the one-pass shear matrix to decrease a time of calculations for the reconstruction 3-D image in the processor. The new system is able to get 3~5 3-D images a second, reconstruct the 3-D dynamic images in real time. 본 논문에서는 3차원 동영상을 구현하기 위하여 인체에 유해한 방사능 피폭량이 부챗살 형태의 Fan Beam 보다 상대적으로 적은 원추형 Cone Beam CT 시스템을 설계하였다. 설계된 시스템은 X-ray가 조사된 각도에서 획득한 데이터를 영상처리부로 전송하고 영상을 구성하는 계산 속도를 빠르게 하기 위하여 초월함수가 보다 적은 3단계 회전 행렬을 이용하여 3차원 영상을 구현하는 회전 기반법을 사용하였다. 본 연구에서는 3차원 영상을 구성하는 시간단축을 통해 초당 3~5장의 영상을 얻음으로써 3차원 동영상을 실시간으로 구현하였다.
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The Algorithm Improved the Speed for the 3-Dimensional CT Video Composition
정찬웅,박진우,전계석,Jeong, Chan-Woong,Park, Jin-Woo,Jun, Kyu-Suk The Acoustical Society of Korea 2009 韓國音響學會誌 Vol.28 No.e2
This paper presents a new fast algorithm, rotation-based method (RBM), for the reconstruction of 3 dimensional image for cone beam computerized tomography (CB CT) system. The system used cone beam has less exposure time of radioactivity than fan beam. The Three-Pass Shear Matrices (TPSM) is applied, that has less transcendental functions than the one-pass shear method to decrease a time of calculations in the computer. To evaluate the quality of the 3-D images and the time for the reconstruction of the 3-D images, another 3-D images were reconstructed by the radon transform under the same condition. For the quality of the 3-D images, the images by radon transform was shown little good quality than REM. But for the time for the reconstruction of the 3-D images REM algorithm was 35 times faster than radon transform. This algorithm offered $4{\sim}5$ frames a second. It meant that it will be possible to reconstruct the 3-D dynamic images in real time. 본 논문에서는 인체에 유해한 방사능 피폭량이 부챗살 형태의 Fan Beam 보다 상대적으로 적은 원추형 Cone Beam CT 시스템을 사용하여 3차원 영상을 빠르게 구성하기 위한 회전 기반법 알고리즘을 제안하였다. 그리고 계산 속도를 빠르게 하기 위하여 초월함수가 더 적은 3단계 회전 행렬을 이용하여 3차원 영상을 구현하였다. 또한 본 연구에서 구성한 영상을 일반적으로 사용되는 라돈 변환 알고리즘으로 구현된 3차원 영상과 비교하여 영상의 질은 평균적으로 단면 영상 당 10% 정도의 오차를 보이며 미약하게 저하되었으나 영상 구성 속도 면에서는 35배 개선됨을 보였다. 이는 대략 초당 $4{\sim}5$ 프레임을 얻을 수 있는 수치이며 간단한 구조를 가진 피사체라면 보다 많은 프레임을 얻을 수 있어 3차원 동영상을 실시간으로 구현할 수 있는 가능성을 보였다.
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3D 동영상획득을 위한 Cone beam 형 X-ray CT 시스템의 알고리즘 구현에 관한 연구
송대건(Dae-Geon Song),정찬웅(Chan-Woong Jeong),전계석(Kyu-Suk Jun) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.2
In this paper, we present a new real-time X-ray CBCT system design and algorithm for the reconstruction of 3D dynamic images was investigated to improve the results. In the experiment, the CB X-ray beam is bigger in size than the fan-type X-ray beam for the increased inspection area. Accordingly, the CBCT system is faster in speed and exposes low radioactivity dose than the FBCT system because of a reduced number of irradiation. For the reconstruction of cross-sectional image, the FDK(Feldkamp-Davis-Kress) algorithm is applied. And a CBCT system is built to monitor the cross-sectional image in real-time. For the reconstruction of 3D image in a CBCT system, a fast algorithm, called the Rotation-Based Method (RBM) is newly applied. Experimental results of image processing, RBM processing algorithms applied TPSM the 3D image takes 0.21 seconds, Radon transform and the Laminating Method as it takes 7.36 seconds on average about 35 times faster than traditional fast results showed computer.
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김현,송대건,황기환,연규헌,전계석 慶熙大學校 大學院 1998 高凰論集 Vol.22 No.-
In this paper, we have been studied the enhancement of SLAM image using average response methos. AR methos has been used to reduce the random noise in signal processing. In this the experiment, we have constructed the SLAM system of 10㎒ operating frequency and experienced for holed Al sample. In this experimental result, we have been found that SLAM using AR method was able to get the high-speed and enhanced image compared with SAM.
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Scanning Tomographic Acoustic Microscope 시스템의 신호검출 연구
전계석,고대식,황기환 慶熙大學校 레이저 工學硏究所 1995 레이저공학 Vol.6 No.-
In the process, that develop the system for the ultrasonic tomographic image with high resolution, called scanning tomographic acoustic microscope(STAM), this paper is presented to the constitution and operation for the data acquisition with high resolution. The principle of BFP(back-and-forth propagation) associated with STAM image reconstruction are discussion. The transfer function to the knife-edge detector is analysed through simulation. In these results, using the knife-edge demodulation technique is shown that can be acquired the surface displacement data less than laser beam of Gaussian intencity profile.
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