-
公开(公告)号：US11350897B2
公开(公告)日：2022-06-07
申请号：US16769483
申请日：2018-11-22
发明人： Rafael Wiemker , Andriy Yaroshenko , Karsten Rindt , Jörg Sabczynski , Thomas Koehler , Hanns-Ingo Maack
摘要： The present invention relates to an apparatus (10) for presentation of dark field information. It is described to provide (210) an X-ray attenuation image of a region of interest of an object. A dark field X-ray image of the region of interest of the object is also provided (220). A plurality of sub-regions of the region of interest are defined (230) based on the X-ray attenuation image of the region of interest or based on the dark field X-ray image of the region of interest. At least one quantitative value is derived (240) for each of the plurality of sub-regions, wherein the at least one quantitative value for a sub-region comprises data derived from the X-ray attenuation image of the sub-region and data derived from the dark field X-ray image of the sub-region. A plurality of figures of merit are assigned (250) to the plurality of sub-regions, wherein a figure of merit for a sub-region is based on the at least one quantitative value for the sub-region. Data representative of the region of interest is output (260) with figures of merit for the respective sub-regions.
-
公开(公告)号：US11000249B2
公开(公告)日：2021-05-11
申请号：US16347992
申请日：2017-11-09
发明人： Heiner Daerr , Thomas Koehler
摘要： An X-ray detector (10) for a phase contrast imaging system (100) and a phase contrast imaging system (100) with such detector (10) are provided. The X-ray detector (10) comprises a scintillation device (12) and a photodetector (14) with a plurality of photosensitive pixels (15) optically coupled to the scintillation device (12), wherein the X-ray detector (10) comprises a primary axis (16) parallel to a surface normal vector of the scintillation device (12), and wherein the scintillation device (12) comprises a wafer substrate (18) having a plurality of grooves (20), which are spaced apart from each other. Each of the grooves (20) extends to a depth (22) along a first direction (21) from a first side (13) of the scintillation device (12) into the wafer substrate (18), wherein each of the grooves (20) is at least partially filled with a scintillation material. Therein, the first direction (21) of at least a part of the plurality of grooves (20) is different from the primary axis (16), such that at least a part of the plurality grooves (20) is tilted with respect to the primary axis (16). An angle between the first direction (21) of a groove (20) arranged in a center region (24) of the scintillation device (12) and the primary axis (16) is smaller than an angle between the first direction (21) of a groove (20) arranged in an outer region (26) of the scintillation device (12) and the primary axis (16).
-
公开(公告)号：US10929974B2
公开(公告)日：2021-02-23
申请号：US16301477
申请日：2017-06-14
发明人： Dirk Schaefer , Heiner Daerr , Thomas Koehler , Ewald Roessl
摘要： Present invention relates to devices and methods for determining a calcium content by analyzing cardiac spectral CT data. CT projection data (9), obtainable by scanning a cardiac region of a subject using a spectral CT scanning unit, is modelled (12) by applying a material decomposition algorithm to the projection data to provide a calcium-specific component. Tomographic reconstructions (13) of the projection data, to provide a first 3D image (8), and of the calcium-specific component, to provide a second 3D image (6), are performed. The first 3D image (8) is segmented (14) to provide an image mask (5) corresponding to a cardiovascular structure of interest, a part of the second 3D image (6) is selected (15) based on the image mask (5), and a calcium content is calculated (16) in the cardiovascular structure of interest based on the selected part of the second 3D image (6).
-
公开(公告)号：US10923243B2
公开(公告)日：2021-02-16
申请号：US16469310
申请日：2017-12-12
发明人： Thomas Koehler , Gereon Vogtmeier
IPC分类号： G21K1/06
摘要： The present invention relates to a grating in X-ray imaging. In order to provide a grating with a facilitated stabilization, a grating (10) for X-ray imaging is provided that comprises a grating structure (12) with a first plurality of bar members (14) and a second plurality of gaps (16). A fixation structure (18) is arranged between the bar members to stabilize the grating bar members. The bar members are extending in a length direction (20) and in a height direction (22). The bar members are also spaced from each other by one of the gaps in a direction transverse to the height direction. The gaps are arranged in a gap direction parallel to the length direction. The fixation structure comprises a plurality of bridging web members (24) that are provided between adjacent bar members. Further, the web members are longitudinal web members that are extending in the gap direction and that are provided in an inclined manner in relation to the height direction. The inclination is provided in the gap direction.
-
公开(公告)号：US10679762B2
公开(公告)日：2020-06-09
申请号：US16307675
申请日：2017-06-08
发明人： Thomas Koehler , Roger Steadman Booker , Matthias Simon , Walter Ruetten , Herfried Karl Wieczorek
IPC分类号： G21K1/02 , G01N23/041 , A61B6/00
摘要： The invention relates to an analyzing grid for phase contrast imaging and/or dark-field imaging, a detector arrangement for phase contrast imaging and/or dark-field imaging comprising such analyzing grid, an X-ray imaging system comprising such detector arrangement, a method for manufacturing such analyzing grid, a computer program element for controlling such analyzing grid or detector arrangement for performing such method and a computer readable medium having stored such computer program element. The analyzing grid comprises a number of X-ray converting gratings. The X-ray converting gratings are configured to convert incident X-ray radiation into light or charge. The number of X-ray converting gratings comprises at least a first X-ray converting grating and a second X-ray converting grating. Further, the X-ray converting gratings each comprise an array of grating bars, wherein the grating bars within each X-ray converting grating are arranged mutually displaced from each other in a direction perpendicular to the incident X-ray radiation by a specific displacement pitch. Further, the grating bars of the first X-ray converting grating are arranged mutually displaced from the grating bars of the second X-ray converting grating in the direction perpendicular to the incident X-ray radiation by the displacement pitch divided by the number of X-ray converting gratings.
-
公开(公告)号：US10568593B2
公开(公告)日：2020-02-25
申请号：US15309483
申请日：2015-05-13
发明人： Thomas Koehler , Roland Proksa
摘要： An imaging system (1400) includes a first and a second focal spot (1410I and 1410N), a first pre-patient radiation beam filter (1416) disposed between the first focal spot and the examination region and having a first profile and a second pre-patient radiation beam filter (1416N) disposed between the second focal spot and the examination region and having a second profile, and a source controller (1412) that controls an operation of the focal spots by modulating the operation during a scan based on at least one of an angular position of focal spots, a shape of a region of interest of subject or object being scanned, or based on a change in size between two adjacent regions of the subject or object being scanned.
-
公开(公告)号：US10458926B2
公开(公告)日：2019-10-29
申请号：US15311886
申请日：2015-05-18
IPC分类号： G01N23/00 , G01N23/04 , A61B6/00 , G01N23/041
摘要： A phantom body (PB) for use in a differential phase contrast imaging apparatus (IM) for calibration of same. The phantom body (PB) allows for simultaneous calibration of three different image signal channels, namely refraction, phase shift and small angle scattering.
-
公开(公告)号：US10420521B2
公开(公告)日：2019-09-24
申请号：US15328086
申请日：2015-07-20
摘要： The grating device (1) for an X-ray imaging device comprises a grating arrangement (10) and an actuation arrangement (20). The grating arrangement (10) comprises a plurality of grating segments (11). The actuation arrangement (20) is configured to move the plurality of grating segments (11) with at least a rotational component between a first position and a second position. In the first position, the grating segments (11) are arranged in the path of an X-ray beam (30), so that the grating segments (11) influence portions of the X-ray beam (30). In the second position, the grating segments (11) are arranged outside the portions of the path of an X-ray beam (30), so that the portions of the X-ray beam (30) are unaffected by the grating segments (11).
-
公开(公告)号：US10368815B2
公开(公告)日：2019-08-06
申请号：US15325551
申请日：2015-07-07
发明人： Thomas Koehler , Ewald Roessl
IPC分类号： A61B6/00 , A61B6/06 , G01N23/083 , A61B6/04
摘要： The invention relates to X-ray imaging. In order to improve flexibility, for example in relation with phase-contrast imaging, the X-ray imaging device (10) comprises an X-ray source arrangement for providing an X-ray beam (11). Further, it is provided at least one grating (13, 14) and a line detector (15) with a plurality of sensor lines, which sensor lines are each provided by a plurality of sensor elements, and which sensor lines are provided for detecting respective portions of the X-ray beam (11) passing the at least one grating during operation. The X-ray imaging device is arranged for moving the line detector (15) and an object (21) to be imaged relative to each other, such that in response to the portions of the X-ray beam a number of interference patterns are detectable at respective different relative positions of the line detector and the object for reconstructing an image of the object (21). The at least one grating (13, 14) comprises at least one first segment (161) and at least one second segment (162) arranged adjacent to each other in a direction perpendicular to the direction of the line detector (15). The X-ray imaging device is arranged for moving the line detector (15) and the at least one grating relative to each other between at least a first relative position and a second relative position, such that in the first relative position, a portion of the X-ray beam (11) during operation passes through the at least one first segment (161), while the at least one second segment (162) is arranged outside said portion of the X-ray beam (11), and that in the second relative position, said portion of the X-ray beam (11) during operation passes through the at least one second segment (162), while the at least one first segment (161) is arranged outside said portion of the X-ray beam (11).
-
公开(公告)号：US10172580B2
公开(公告)日：2019-01-08
申请号：US15104816
申请日：2014-12-03
发明人： Ewald Roessl , Hendrik Albert Pastink , Thomas Koehler , Heiner Daerr , Udo Van Stevendaal , Gerhard Martens
摘要： A phase contrast imaging apparatus (MA) and related image processing method. The imaging apparatus includes a movable arm (AR) that carries a detector (D) and one or more interferometric gratings (G0,G1,G2). The imaging apparatus includes a rigidizer (RGD) to control the rigidity of at least the arm (AR) or a mounting (GM) for the gratings (G0,G1,G2). This allows controlling a drift of a Moiré pattern as detected in a sequence of readouts. A phase of the so controlled Moiré pattern can be used to calibrate the imaging apparatus by using the image processing method.
-
-
-
-
-
-
-
-
-
搜索结果
91 条记录 (耗时 0.027 秒)