• Title, Summary, Keyword: 3D voxel array

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Method of Making the Distribution of Voxels Uniform within the Volumetric 3D image Space

  • Lin, Yuanfang;Liu, Xu;Xie, Xiaoyan;Liu, Xiangdong;Li, Haifeng
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1138-1141
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    • 2008
  • By defining a uniform reference point array corresponding to the 3D voxel array and abandoning voxels whose deviations from their respective reference points exceed a given tolerance, the distribution of voxels within the volumetric 3D image space gets uniform, effects of non-uniform distribution upon the image reconstructing are eased.

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3D Stacked Radiation Collimator (적층구조의 3차원 콜리메이터)

  • Yoon, Dok-Un;Lee, Tae-Woong;Lee, Won-Ho
    • Journal of radiological science and technology
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    • v.36 no.2
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    • pp.157-163
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    • 2013
  • Multileaf collimators whose Pb leaves are moving in two-dimensional directions have been used. We propose a different concept three-dimensional (3D) collimator with 3D shape that is automatically changeable to modulate the radiation dose even for complex tumors in real time. A voxel collimator, including a hinged Pb plane and a 3D assembly of many voxel collimators, was used. In each frame rotation axis, a motor, which was controlled by a circuit with field-programmable gate array (FPGA) board connected with computer, was operated according to a predetermined plan. Simulations of that, which are generally used for planning, were performed and compared with experimental results.

Fast Algorithm to Generate the Array of Elementa 1 Image in Integral Imaging Systems (집적영상 기술에서의 요소영상 배열을 생성하기 위한 Fast 알고리즘)

  • Kwon, Young-Man;Kim, Eun-Soo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.11C
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    • pp.898-904
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    • 2008
  • In this paper, we propose a fast algorithm to generate the array of elemental image in a computer generated integral imaging system. It generates the array of elemental image using depth information, needs less computing time to produce the result by using the concept of boundary area and computing the voxel within boundary area. By comparing the computing time of proposed algorithm with that of the existing algorithm theoretically and experimently, we proved the efficiency of this algorithm.

Development of the Reference Korean Female Voxel Phantom (한국인 기준여성 체적소형 모의체 개발)

  • Ham, Bo-Kyoung;Cho, Kun-Woo;Yeom, Yoen-Soo;Jeong, Jong-Hwi;Kim, Chan-Hyeong;Han, Min-Cheol
    • Journal of Radiation Protection and Research
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    • v.37 no.1
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    • pp.41-49
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    • 2012
  • The objective of this study is for development of the reference Korean female phantom, HDRK-Woman. The phantom was constructed by adjusting a Korean woman voxel phantom to the Reference Korean data. The Korean woman phantom had been developed based on the high-resolution color slice images obtained from an adult Korean female cadaver. There were a total of 39 organs including the 27 organs specified in ICRP 103 for effective dose calculation. The voxel resolution of the phantom was $1.976{\times}1.976{\times}2.0619\;mm^3$ and the voxel array size is $261{\times}109{\times}825$ in the x, y and z directions. Then, the voxel resolution was changed to $2.0351{\times}2.0351{\times}2.0747\;mm^3$ for adjustment of the height and total bone mass of the phantom to the Reference Korean data. Finally, the internal organs and tissue were adjusted using in-house software program developed for 3D volume adjustment of the organs and tissue. The effective dose values of HDRK phantoms were calculated for broad parallel photon beams using MCNPX Monte Carlo code and compared with those of ICRP phantoms.

Construction of Static 3D Ultrasonography Image by Radiation Beam Tracking Method from 1D Array Probe (1차원 배열 탐촉자의 방사빔추적기법을 이용한 정적 3차원 초음파진단영상 구성)

  • Kim, Yong Tae;Doh, Il;Ahn, Bongyoung;Kim, Kwang-Youn
    • Journal of the Korean Society for Nondestructive Testing
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    • v.35 no.2
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    • pp.128-133
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    • 2015
  • This paper describes the construction of a static 3D ultrasonography image by tracking the radiation beam position during the handy operation of a 1D array probe to enable point-of-care use. The theoretical model of the transformation from the translational and rotational information of the sensor mounted on the probe to the reference Cartesian coordinate system was given. The signal amplification and serial communication interface module was made using a commercially available sensor. A test phantom was also made using silicone putty in a donut shape. During the movement of the hand-held probe, B-mode movie and sensor signals were recorded. B-mode images were periodically selected from the movie, and the gray levels of the pixels for each image were converted to the gray levels of 3D voxels. 3D and 2D images of arbitrary cross-section of the B-mode type were also constructed from the voxel data, and agreed well with the shape of the test phantom.