摘要:
Apparatus which can be used in a context of image reconstruction on the basis of projection data produced by an imaging modality, such as computer tomography or magnetic resonance imaging comprises a residual projection data processor (101; 201; 301) and an image reconstruction unit (102; 202; 302). The residual projection data processor (101; 201; 301) is configured to determine residual projection data (Δ g ; Δ g̃ ; Δ ) by cancelling reference projection data ( g ref ; g̃ ref ) from measured projection data ( g obs ; g̃ obs ). The measured projection data ( g obs ; g̃ obs ) represents a measured projection of a test object under examination obtained by an imaging modality. The reference projection data ( g ref ; g̃ ref ) represents a projection of a reference object. The image reconstruction unit (102; 202; 302) is configured to reconstruct a resulting residual image (Δ f ; Δ f̃ ; Δ ) on the basis of the residual projection data (Δ g ; Δ g̃ ; Δ ) by solving an inverse projection transformation problem that links the residual projection data (Δ g ; Δ g̃ ; Δ ) to the resulting residual image (Δ f ; Δ f̃ ; Δ ). The resulting residual image (Δ f ; Δ f̃; Δ ) represents differences between the reference object and the test object under examination. A corresponding method is also described.
摘要翻译:可以在基于由诸如计算机断层摄影或磁共振成像的成像模态产生的投影数据的图像重建的上下文中使用的装置包括残余投影数据处理器(101; 201; 301)和图像重建单元 102; 202; 302)。 剩余投影数据处理器(101; 201; 301)被配置为通过从测量的投影数据(g obs; g obs)中取消参考投影数据(g ref; g ref)来确定剩余投影数据(“g” )。 测量的投影数据(g obs; g obs)表示通过成像模态获得的检查对象的测量投影。 参考投影数据(g ref; g ref)表示参考对象的投影。 图像重建单元(102; 202; 302)被配置为通过求解反投影来重建基于剩余投影数据(“g”“g”)的结果剩余图像(“f”“f”) 将剩余投影数据(“g”“g”)连接到所得到的残差图像(“f”“f”)的变换问题。 所得到的残差图像(“f”“f”)表示参考对象和检查对象之间的差异。 还描述了相应的方法。
摘要:
An apparatus for providing an image is provided. The apparatus comprises a sensor (110) comprising a plurality of sensor pixels, wherein each of the sensor pixels of the sensor (110) comprises one or more photosensitive elements, wherein each of the one or more photosensitive elements comprises a photosensitive area, wherein the sensor (110) is configured to provide image data comprising a plurality of first image pixels, and wherein each of the sensor pixels is configured to provide one of the first image pixels of the image data. Moreover, the apparatus comprises an image reconstructor (120; 220) for providing the image, wherein the image comprises a plurality of second image pixels, wherein the image reconstructor (120; 220) is configured to generate the second image pixels of the image depending on the first image pixels of the image data, wherein the number of the first image pixels of the image data is smaller than the number of the second image pixels of the image data, wherein the image reconstructor (120; 220) is configured to generate each of a group of one or more of the second image pixels depending on at least two of the first image pixels. At least one of the sensor pixels of the sensor (110) comprises two or more photosensitive elements being connected such that said one of the first image pixels provided by said sensor pixel depends on each of the two or more photosensitive elements. Or, the photosensitive area of a first one of the photosensitive elements of the sensor pixels of the sensor (110) has a first shape being different from a second shape of the photosensitive area of a second one of the photosensitive elements of the sensor pixels, wherein said first shape is concave.