In this paper, the spatially varying point spread function (PSF) of the general cone-beam x-ray reconstruction formula is derived. It is proved that the vertical integral of the PSF is a two-dimensional function. Therefore, although the general cone-beam formula is not exact in nature, the...
1)Point spread function点扩展函数 1.Research of X-ray imaging system point spread function in theory and experiment;X射线成像系统点扩展函数理论模型及其实验验证 2.Point spread function of neutron pinhole imaging in high gamma ray background;强γ背景下中子针孔成像的点扩展函数 3.Research on estimatio...
When successful, the reconstruction produces an image of the medium, but for the Delay-and-Sum (DAS) approach, the point spread function (PSF) is a diffraction-limited result with sidelobes. Distortions may occur due to using a reconstruction sound speed that is different from the true sound...
its far-field PSF is still challenged to be expressed as a mathematic formula. In order to understand the distance-dependent PSF under SELFI, we conducted a numerical simulation by finite element analysis (JCMwave, details in Supplementary Information Note3). We calculated the far-field image pa...
This is the renowned Rossi-alpha formula without delayed neutrons, which can only be considered as a probability, even approximately, if both intervals dθ and du in (4.149) are infinitesimally small. The derivation of this formula with the inclusion of delayed neutrons is given in Part II, ...
Define point target. point target synonyms, point target pronunciation, point target translation, English dictionary definition of point target. A target which requires the accurate placement of bombs or fire. Dictionary of Military and Associated Terms.
The point spread function of the SXT telescope aboard Yohkoh has been measured in flight configuration in three different X-ray lines at White Sands Missi... PC Martens,LW Acton,JR Lemen - 《Solar Physics》 被引量: 57发表: 1995年 Tao, L. & Nicholson, C. The three-dimensional point spre...
Furthermore, it immediately leads to formulae for the epipolar lines. To see this, first note that in the C1 camera frame: (1.92)p1=(f1/Z1)P1 while in the C2 camera frame (and expressed in terms of that frame of reference): (1.93)p2′=(f2/Z2)P2′ Eliminating P1 and P2′, and...
You can set up a floating formula bar that end users can use to add formulas. The formula bar is similar to the formula editor available to the developer and has the appearance of a text box. The formula bar provides a list of calculation functions. It also provides a visual method of ...
1) point spread parameter 点扩散参数1. Furthermore,the methods for getting point spread parameter and extracting depth information of micro needle are presented in detail. 首先,论述了深度信息提取原理;之后,研究了微针的成像模型,详细分析了显微图像点扩散参数获取与微针深度信息提取的方法,给出了相关的...