摘要:
Imaging apparatus, for analyzing an object, comprising: a radiation source for transmission of radiation through said object in a section plane of said object; a radiation detector for detecting said radiation in said section plane of said object after transmission through said object; and a masking device for masking out a part of said radiation, wherein said masked part of said radiation is movable in said section plane relative to said radiation detector during said analysis of said object.
摘要:
An image processing method for providing a digitized image as an approximation of an image function ƒ, wherein the digitized image comprises a plurality of pixels with a predetermined pixel size, comprises the steps of providing the image function ƒ from Radon data comprising a plurality of projection functions measured corresponding to a plurality of predetermined projection directions (ν), and determining pixel values from the image function, the pixel values representing the digitized image to be obtained, wherein the pixel values are determined in dependence on at least two image function values within the pixel size of the respective pixel. Furthermore, an imaging method and an imaging device using the image processing method are described.
摘要:
An imaging method for imaging a region of investigation of an object comprises the steps of generating an energy input beam with an energy beam source, irradiating the region of investigation with energy input beam components of the energy input beam along a plurality of projection directions, the energy input beam components being formed with a frame mask being arranged between the energy input beam and the object and including frame mask windows, measuring first integrated attenuation values of the energy input beam components with an outer detector device arranged outside the frame mask, measuring second integrated attenuation values of the energy input beam components with a frame mask detector device being arranged on an inner surface of the frame mask, and reconstructing an image of the region of investigation based on the first and second integrated attenuation values. Furthermore, an imaging device for imaging a region of investigation of an object is described.
摘要:
An image reconstruction method for reconstructing a tomographic image (fj) of a region of investigation within an object (1), comprises the steps of providing detector data (yi) comprising Poisson random values measured at an i-th of a plurality of different positions, e.g. i=(k,l) with pixel index k on a detector device and angular index l referring to both the angular position (αl) and the rotation radius (rl) of the detector device (10) relative to the object (1), providing a predetermined system matrix Aij assigning a j-th voxel of the object (1) to the i-th detector data (yi), and reconstructing the tomographic image (fj) based on the detector data (yi), said reconstructing step including a procedure of minimizing a functional F(f) depending on the detector data (yi) and the system matrix Aij and additionally including a sparse or compressive representation of the object (1) in an orthobasis T, wherein the tomographic image (fj) represents the global minimum of the functional F(f). Furthermore, an imaging method and an imaging device using the image reconstruction method are described.
摘要翻译:一种用于重建物体(1)内的调查区域的断层图像(fj)的图像重建方法,包括以下步骤:提供检测器数据(yi),其包括在多个不同位置的第i个测量的泊松随机值 ,例如 i =(k,l),检测器装置上具有像素索引k,角度指数l指的是检测装置(10)相对于物体(1)的角位置(α1)和旋转半径(rl) 提供将对象(1)的第j个体素分配给第i个检测器数据(yi)的预定系统矩阵Aij,以及基于检测器数据(yi)重建断层图像(fj),所述重建步骤包括 根据检测器数据(yi)和系统矩阵Aij最小化功能F(f)的程序,并且还包括邻接位置T中的物体(1)的稀疏或压缩表示,其中断层图像(fj)表示 函数F(f)的全局最小值。 此外,描述了使用图像重建方法的成像方法和成像装置。
摘要:
The invention relates to a method for operating an electronic terminal (1.1-1.4) comprising an integrated image sensor (2.1-2.4) that has a large number of pixels, in particular for a mobile telephone. According to the invention, a dosage value of ionising radiation striking the image sensor is determined by means of the image sensor (2.1-2.4). The invention further relates to a terminal that operates accordingly (e.g. a smart phone having a corresponding application program).
摘要:
The invention relates to an electronic device, in particular a mobile telephone (1), comprising an image sensor (4) with multiple pixels for capturing an image. The image sensor (4) is also sensitive to ionizing radiation, in particular pulsed high-energy radiation. The invention additionally relates to a radiation sensor (5) for measuring the ionizing radiation.
摘要:
An image reconstruction method for reconstructing a tomographic image (fj) of a region of investigation within an object (1), comprises the steps of providing detector data (yi) comprising Poisson random values measured at an i-th of a plurality of different positions, e.g. i=(k,l) with pixel index k on a detector device and angular index l referring to both the angular position (αl) and the rotation radius (rl) of the detector device (10) relative to the object (1), providing a predetermined system matrix Aij assigning a j-th voxel of the object (1) to the i-th detector data (yi), and reconstructing the tomographic image (fj) based on the detector data (yi), said reconstructing step including a procedure of minimizing a functional F(f) depending on the detector data (yi) and the system matrix Aij and additionally including a sparse or compressive representation of the object (1) in an orthobasis T, wherein the tomographic image (fj) represents the global minimum of the functional F(f). Furthermore, an imaging method and an imaging device using the image reconstruction method are described.
摘要翻译:一种用于重建物体(1)内的调查区域的断层图像(fj)的图像重建方法,包括以下步骤:提供检测器数据(yi),其包括在多个不同位置的第i个测量的泊松随机值 ,例如 i =(k,l),检测器装置上具有像素索引k,并且角度指数l指的是检测器装置(10)相对于物体(1)的角位置(α)和旋转半径(rl) 提供将对象(1)的第j个体素分配给第i检测器数据(yi)的预定系统矩阵Aij,以及基于检测器数据(yi)重建断层图像(fj),所述重建步骤包括 根据检测器数据(yi)和系统矩阵Aij最小化功能F(f)的程序,并且还包括邻接位置T中的物体(1)的稀疏或压缩表示,其中断层图像(fj)表示 函数F(f)的全局最小值。 此外,描述了使用图像重建方法的成像方法和成像装置。
摘要:
The invention relates to a monitoring device (6) for monitoring the environment, in particular for monitoring the environment for radioactive radiation, comprising at least one receiver for receiving measured values of an environmental variable that potentially poses a health hazard and comprising a computing unit (10) for computing a hazard warning (4.1-4.4) dependent on the measured values. The receiver is designed to receive the measured values from a plurality of spatially distributed electronic terminals (2.1-2.4), in particular from mobile telephones with an image sensor for measuring the radioactive radiation. The invention further relates to a corresponding terminal (2.1-2.4) and to a complete monitoring system with a monitoring device and numerous terminals (2.1-2.4) for measuring the environmental variable.
摘要:
The invention relates to a method for operating an electronic terminal (1.1-1.4) comprising an integrated image sensor (2.1-2.4) that has a large number of pixels, in particular for a mobile telephone. According to the invention, a dosage value of ionizing radiation striking the image sensor is determined by means of the image sensor (2.1-2.4). The invention further relates to a terminal that operates accordingly (e.g. a smart phone having a corresponding application program).
摘要:
The invention relates to a monitoring device (6) for monitoring the environment, in particular for monitoring the environment for radioactive radiation, comprising at least one receiver for receiving measured values of an environmental variable that potentially poses a health hazard and comprising a computing unit (10) for computing a hazard warning (4.1-4.4) dependent on the measured values. The receiver is designed to receive the measured values from a plurality of spatially distributed electronic terminals (2.1-2.4), in particular from mobile telephones with an image sensor for measuring the radioactive radiation. The invention further relates to a corresponding terminal (2.1-2.4) and to a complete monitoring system with a monitoring device and numerous terminals (2.1-2.4) for measuring the environmental variable.