fan beam 中文意思是什麼

fan beam 解釋
扇形波射束
  • fan : n 1 扇子；風扇，鼓風機。2 簸箕；揚谷機；（風車的）定風翼；【航空】螺旋槳，螺旋槳葉片。3 扇狀物（...
  • beam : n 1 梁，棟梁，桁條；（船的）橫梁。2 船幅；（動物、人的）體幅。3 （秤）桿，杠桿，（織機的）卷軸，...
  1. A new kind of fan - beam antennas

    一種新型扇形波束天線
  2. The image reconstruction algorithms is thoroughly researched. the filter back projection ( fbp ), algebra reconstruction technology ( art ) and fan beam data rearrangement algorithm used in medical computer tomography are improved. the noser algorithm, linear neural networks method and hopfield neural networks method are presented and gain the better result of image reconstruction

    深入研究了圖像重建演算法，改進了醫學ct的濾波反投影演算法、代數重建技術和扇束投影數據重排方法，提出了帶圖像光滑約束的noser演算法、線性神經網路方法和hopfield神經網路方法，並得到了較好的圖像重建結果。
  3. In the terms of interpolation, the image reconstructed from nearest interpolation or linear interpolation has good edge but serious noise ; reconstruction from 4 * 4cubic interpolation or three b - spline or three - order lagrange interpolations has better local character. 2 x 2cubic interpolations which has both better edge and local character is the ideal interpolation, the following is the basic principle during reconstruction : ( 1 ) the more width of interpolation, the more number of summation and the more order of interpolation polynomial, the higher of density resolution ; ( 2 ) the more of interpolation polynomial and width of interpolation, the more of reconstruction time simultaneously, aimed at eliminating the effects of noise contained in projection data, in this paper, author analysis cause and effects of common artifacts. importantly, discusses convolution back - projection reconstruction algorithm with a shift axis of rotation has been derived for correcting images that acquired with a divergence axis of rotation using the fan beam geometry with an angle - equaled detector

    在ct圖像重建時，選擇有限帶寬窗有較好的空間解析度，三角形窗有較好的密度解析度，選擇餘弦窗則使得空間解析度與密度解析度的折衷；從窗函數的頻譜角度來講，可以用於圖像重建的一個良好的卷積窗函數應該具備以下條件： （ ? ）小的3db帶寬b ，即最小的主瓣寬度； （ ? ）最小的旁瓣最大峰值a ； （ ? ）最大的旁瓣峰值衰減速度d ；就內插函數而言，臨近點內插與線性內插重建圖像噪聲大，但有較好的邊緣與細節； 4 4三次內插、三次b -樣條與四次拉格朗日多項式內插圖像平滑，局部特性較好。
  4. This paper regards narrow fan - beam scan mode as multi - detector parallel beam scan mode

    本論文將窄角扇束掃描看成是多探頭的平行束掃描。
  5. In this paper, the author discusses in detail an efficient iterative image reconstruction algorithm in industrial computerized tomography ( ict ) with the narrow fan - beam projection

    本文對工業ct窄角扇束掃描方式下的迭代圖像重建演算法進行了研究。
  6. Its image reconstruction belongs to the image reconstruction under narrow fan - beam scan mode. after comparing different algorithms, this paper introduces convolution back projection algorithm for the parallel image reconstruction

    採用高能直線加速器作為射線源的高能x射線工業ct機多採用窄角扇束掃描方式，其圖像重建屬窄角扇束掃描方式下的圖像重建。
  7. The narrow fan - beams are reset into parallel beam then the image reconstruction is conducted by parallel beam " convolution back projection algorithm, which combines the high scan efficiency with the convenience of image reconstruction. this paper analyses the parallelism in narrow fan - beam " convolution back projection algorithm, divides the task of image reconstruction into several subtasks, and discusses the parallelization of narrow fan - beam " decomposition and reset, parallel beam " convolution back projection, and image accumulation

    對于窄角扇束掃描方式，把窄角扇束重排成平行束，再由平行束卷積反投影重建演算法來重建圖像，是把掃描的高效率和重建方式的簡便易行很好的結合起來。本論文對窄角扇束卷積反投影演算法進行了并行性分析，指出把圖像重建任務分解為多個子任務并行工作，並在工作站機群上討論了窄角扇束的分解、重排、平行束卷積反投影圖像重建、圖像合成的并行實現。
  8. 2. the design thought of annular fan beam sensor structure is presented, and array laser sensor of 15x5 fan beams structure was developed. the sensor ' s measurement sensitivity distribution and spatial resolution are analyzed and calculated

    提出了環形扇束傳感器結構的設計思想，並研製了15 5扇束結構的陣列式激光傳感器，以及對其測量靈敏度分佈和空間解析度等性能指標進行了分析計算。
  9. In this paper, the author attempts to discuss two main problems of convolution back projection algorithm basing on fan - beam scanning

    本文主要探討了卷積反投影演算法的兩個核心問題：卷積窗函數與內插函數。
  10. In this paper, two novel algorithms of reconstructing high resolution images from both overlapped parallel projection data and overlapped fan beam projection data with low resolution are presented. one is called virtual detector algorithm, and the other is direct reconstruction algorithm. both of the algorithms with two forms for the parallel data and fan beam data respectively are developed based on the interpolative algebraic reconstruction techniques ( iart )

    本文在研究插值代數重建法（ iart ）的基礎上，根據特別設計的數據採集模式（平行相疊采樣和扇形相疊采樣） ，提出了由相疊低分辨數據重建高分辨圖像的兩個新演算法，即虛擬探測器法和直接重建法。
  11. On the base of the related research achievement, the structure and characteristics of annular fan beam sensor, principle of light scanning, image reconstruction, image explanation and system frequency domain analysis are thoroughly researched. there will be a helpful exploration for developing and utilizing the novel optical measurement technique

    在國內外相關研究進展的基礎上，對環形扇束光學傳感結構及特性、光線掃描原理、圖像重建、圖像解釋和系統綜合分析等方面進行了深入的研究，為進一步開發利用該項新型光測技術進行了有益的探索。
  12. One has to set up a point source in the far field and rotate the system in the fan beam direction. the difficulty is mainly due to the incomplete test environment

    但是，測量g矩陣不是一件很容易的工作，必須旋轉儀器掃描遠場的點源得到，測試條件要求比較苛刻。
  13. The simulation results show that, either for parallel geometry or for fan beam geometry, high resolution images can be reconstructed by means of both the algorithms from the overlapped projection data. moreover, the quality of the images reconstructed by the virtual detector algorithm from the overlapped low - resolution projection data is almost as good as that of the images reconstructed directly from the high - resolution projection data

    大量模擬試驗結果表明，無論對平行束的相疊低分辨數據還是對扇形束的相疊低分辨數據，用虛擬探測器法和直接重建法均可由相疊低分辨數據重建出具有較高解析度的圖像。
  14. When x - ict detects large industrial parts and requires high resolving power, image reconstruction of x - ict has huge pixel matrix and the amount of calculation increases greatly resulting in much more time of image reconstruction. this paper proposes the parallel image reconstruction based on workstations cluster to solve fast image reconstruction of high power x - ict this paper presents the relevant basic theories and principles of ict and image reconstruction, including scan mode and image reconstruction algorithm. high power x - ict which adopts powerful beeline accelerator as radial source often uses narrow fan - beam scan mode

    工業ct機檢測對象為大型工業構件並且要求高解析度時，圖像重建的像素點陣巨大，計算量大大增加，從而圖像重建時間過長。本論文提出用在工作站機群上的多機并行工作的并行圖像重建解決高能x射線工業ct機的快速圖像重建問題。本論文介紹了工業ct和圖像重建的基本理論、基本原理等有關內容，包括掃描方式和圖像重建演算法。
  15. The parallelization of image reconstruction by convolution back projection with narrow fan - beam based on workstations cluster can solve fast image reconstruction of high power x - ict, and the speed of parallel image reconstruction relates to the numbers of workstations involved

    本論文採用窄角扇束卷積反投影圖像重建在工作站機群上的并行實現能解決高能x射線工業ct機的快速圖像重建問題，并行圖像重建的速度與參與并行實現的工作站數有關。
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