The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform

Norio Harao - One of the best experts on this subject based on the ideXlab platform.

  • x ray Image Intensifier
    Catheterization and Cardiovascular Interventions, 1999
    Co-Authors: Hiroshi Minami, Takashi Kuze, Norio Harao
    Abstract:

    An X-ray Image Intensifier includes an envelope having an input window consisting of an aluminum alloy, and an input phosphor screen arranged in the envelope to oppose the input window, and including a substrate, an input phosphor layer formed on the substrate, and a photocathode formed on the input phosphor layer, wherein the aluminum alloy contains 3 to 6 wt % of Mg and 0.01 to 0.5 wt % of Zr. This aluminum alloy may further contain at least one metal element selected from the group consisting of 0.1 to 1 wt % of Mn, 0.01 to 0.5 wt % of Cr, 0.01 to 0.5 wt % of Sc, and 0.01 to 0.05 wt % of Ti.

Giso Hahn - One of the best experts on this subject based on the ideXlab platform.

  • time resolved photoluminescence imaging with electronic shuttering using an Image Intensifier unit
    Solar Energy Materials and Solar Cells, 2012
    Co-Authors: David Kiliani, Axel Herguth, Gabriel Micard, Jan Ebser, Giso Hahn
    Abstract:

    Abstract In contrast to traditional steady-state photoluminescence imaging (PLI), time-resolved photoluminescence imaging (TR-PLI) allows for a calibration-free measurement of the effective transient minority charge carrier lifetime τ eff in a silicon sample. For transient photoluminescence measurements, the illumination source as well as the camera signal have to be modulated on a time-scale in the order of τ eff . Different approaches for camera signal modulation have been presented, including the use of a complementary metal-oxide-semiconductor (CMOS) camera or a rotating shutter wheel. In this work, the use of an InGaAs-based Image Intensifier unit as a fast optical shutter for TR-PLI was evaluated. Due to the fast switching times of the Image Intensifier, effective lifetimes down to 1/50 of the modulation period could be resolved reliably. Measurements under different illumination conditions allow for an injection-dependant analysis of τ eff and comparison to photoconductance decay measurements.

Hiroshi Minami - One of the best experts on this subject based on the ideXlab platform.

  • x ray Image Intensifier
    Catheterization and Cardiovascular Interventions, 1999
    Co-Authors: Hiroshi Minami, Takashi Kuze, Norio Harao
    Abstract:

    An X-ray Image Intensifier includes an envelope having an input window consisting of an aluminum alloy, and an input phosphor screen arranged in the envelope to oppose the input window, and including a substrate, an input phosphor layer formed on the substrate, and a photocathode formed on the input phosphor layer, wherein the aluminum alloy contains 3 to 6 wt % of Mg and 0.01 to 0.5 wt % of Zr. This aluminum alloy may further contain at least one metal element selected from the group consisting of 0.1 to 1 wt % of Mn, 0.01 to 0.5 wt % of Cr, 0.01 to 0.5 wt % of Sc, and 0.01 to 0.05 wt % of Ti.

Yingping He - One of the best experts on this subject based on the ideXlab platform.

  • Research on detectable threshold of double MCP ultraviolet Image Intensifier tube
    International Symposium on Photoelectronic Detection and Imaging 2013: Low-Light-Level Technology and Applications, 2013
    Co-Authors: Hong-chang Cheng, Qing-duo Duanmu, Liu Feng, Yingping He
    Abstract:

    In order to research the influence of the quantity of the Micro-Channel Plates (MCP) on the detectable threshold of the ultraviolet Image Intensifier tube, the wide spectrum Image Intensifier gain tester produced by Nanjing University of Science and Technology is employed to test the relation curves between self-made one single MCP ultraviolet Image Intensifier tube, two double MCP ultraviolet Image Intensifier tubes, and photocathode incidence radiation illumination respectively. With reference to the 3 rd -generation low-light Image Intensifier failure theory, if the radiation gain of the ultraviolet Image Intensifier tube is defined as 1,000cd/m 2 , the tube will lose the effect of Image intensification, when the corresponding photocathode incidence radiation illumination will be the minimum detectable threshold. Viewed from the test results, the minimum detectable threshold of the single MCP ultraviolet Image Intensifier tube is 3.0×10 -6 W/m 2 , with the radiance gain linear interval between 3.0×10 -6 W/m 2 ～4.6×10 -5 W/m 2 ; and that of the double MCP ultraviolet Image Intensifier tubes is 4×10 -7 W/m 2 , with the radiance gain linear interval between 4.0×10 -7 W/m2 ～2.0×10 -5 W/m 2 . The test results were analyzed on the basis of the MCP self-saturation effect, concluding that the saturation current density of the single-unit MCP is a fixed , but there may be certain difference among the saturation current density of different MCPs due to different materials and manufacturing processes. The test results show that the maximum of the radiation gain linear interval of the three ultraviolet Image Intensifier tubes are at the magnitude of 10 -5 W/m2, and the non-significant differences also verified the theory. In the double MCP ultraviolet Image Intensifier tubes, the photocathode-produced photocurrent is multiplied in passing the first MCP and then reaches the second MCP, so the second MCP will reach the state of current saturation earlier than the first MCP, making the minimum detectable threshold of the double MCP ultraviolet Image Intensifier tubes is lower than that of the single ultraviolet Image Intensifier tube by one order of magnitude, with the linear gain interval increasing by one magnitude, and the absolute of the corresponding radiation gain of the same radiation illumination within the linear gain interval increasing by 10 times, verifying that the double MCPs can detect much lower and weaker ultraviolet radiation and realize the high gain theory. The research results has certain guiding effect towards the promotion and application of the double ultraviolet Image Intensifier tubes, and has great significance on enhancing the high ultraviolet radiation detection and imaging technology.

  • Measurement and analysis of signal to noise ratio for Image Intensifier tube, 18mm microchannel plate
    International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, 2011
    Co-Authors: Hanliang Feng, Yingping He
    Abstract:

    Output signal to noise ratio is an important technical index for evaluating detectability of microchannel plate Image Intensifier tube, and the characteristic for detecting of microchannel plate Image Intensifier tube restricts the detectability of the night vision system. It has been proved in theory and in practice that the value of output signal to noise ratio of Image Intensifier tube equipped for night vision system decides the farthest distance and imaging definition of system which used under low light level in square root way. In this article, method and device for measuring the output signal to noise ratio of 18mm microchannel plate Image Intensifier tube has been introduced in detail. Output signal to noise ratio values of several 18mm microchannel plate Image Intensifier tube selected have been measured. Contacting to work condition of Image Intensifier tube, relationship between voltage of cathode, microchannel plate, screen and output signal to noise ratio of 18mm microchannel plate Image Intensifier tube bas been studied, which is available for other Image Intensifier tube.

Ruola Ning - One of the best experts on this subject based on the ideXlab platform.

  • accurate and efficient Image Intensifier distortion correction algorithm for volume tomographic angiography
    Optical Engineering, 1998
    Co-Authors: Xiaohui Wang, Ruola Ning
    Abstract:

    The recent advance in Image Intensifier based volume tomog- raphic angiography has stirred a significant interest in the development of accurate and efficient algorithms to correct Image Intensifier distor- tions. An algorithm and its calibration protocol are developed to correct the distortion caused by the Image Intensifier-CCD camera imaging chain in a single step regardless of distortion sources. This algorithm first partitions a distorted Image into small quadrilateral regions, then maps each region individually to the corrected Image using the corresponding bilinear functions. The general applicable parameters of these bilinear functions can be obtained using a specially designed grid phantom. The algorithm and the calibration protocol are tested using this grid phantom on a newly built Image Intensifier based volume tomographic angiogra- phy imaging system. The maximum distortion error is reduced from 5.96 mm before correction to 0.05 mm after correction. Further validation of the proposed algorithm is performed through three-dimensional tomog- raphic reconstructions of a vascular phantom and animal studies. The reconstruction results indicate that the accuracy of the algorithm and the calibration protocol is acceptable for volume tomographic angiography. This algorithm can also be applied to radiation therapy and stereosurgi- cal treatment planning where Image Intensifier distortions must be cor- rected. © 1998 Society of Photo-Optical Instrumentation Engineers. (S0091-3286(98)03603-4)

  • Image Intensifier based volume tomographic angiography imaging system
    Medical Imaging 1997: Physics of Medical Imaging, 1997
    Co-Authors: Ruola Ning, Xiaohui Wang, David L Conover, Xiangyang Tang
    Abstract:

    An Image Intensifier-based rotational volume tomographic digital angiography (VTDA) imaging system has been constructed. The system consists of an x-ray tube and an Image Intensifier that are separately mounted on a gantry. This system uses an Image Intensifier coupled to a charge coupled device camera as a 2D detector so that a set of 2D projection can be acquired for a direct 3D reconstruction. This paper presents the results of the system evaluation and preliminary animal studies using the volume tomographic system. The results indicate that the system has isotropic resolution of 0.5-1.0 1p/mm in the x, y and z directions, and the contrast resolution of the current system is 150 Hounsfield Unit for a 2mm vessel at 806 mR exposure. The results from the animal studies demonstrate that VTDA only needs a single injection of contrast and volume scanning to provide adequate Image contrast and resolution for quantitative assessment of vascular anatomy.