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1. 发明授权

US09625589B2 Photon counting x-ray detector 有权
公开(公告)号：US09625589B2
公开(公告)日：2017-04-18
申请号：US14421303
申请日：2013-07-15
申请人： KONINKLIJKE PHILIPS N.V. , PHILIPS DEUTSCHLAND GMBH
发明人： Ewald Roessl , Daerr Heiner , Roger Steadman Booker
IPC分类号： H05G1/60 , G01T1/24 , G01N23/04
CPC分类号： G01T1/247 , G01N23/046 , G01T1/171 , G01T1/248
摘要： The invention relates to a method and an X-ray detector (100) for detecting incident X-ray photons (X). The X-ray detector (100) comprises at least one sensor unit (105) in which X-ray photons (X) are converted into sensor signals (s) and at least one flux sensor (104) for generating a flux signal (f) related to the flux of photons (X). The sensor signals (s) are corrected based on the flux signal (f). In a preferred embodiment, the sensor signals (s) represent a spectrally resolved pulse counting. The flux sensor (104) may be integrated into an ASIC (103) that is coupled to the sensor unit (105).

2. 发明授权

US11002865B2 Detection values determination system 有权
公开(公告)号：US11002865B2
公开(公告)日：2021-05-11
申请号：US15776085
申请日：2016-11-20
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Ewald Roessl , Roger Steadman Booker
IPC分类号： G01T1/29
摘要： The invention relates to a detection values determination system, especially for photon-counting CT scanners, comprising a detection pulse providing unit for providing detection pulses for an array of detection pixels 17, which is provided with an anti-charge-sharing grid 15 for suppressing charge sharing between different clusters 14 of the detection pixels, wherein the detection pulses are indicative of the energy of photons incident on the detection pixels. Charge-sharing-corrected detection values are determined based on the provided detection pulses, wherein for determining a charge-sharing-corrected detection value for a detection pixel of a cluster only detection pixels of the same cluster are considered. This allows for a relatively high detective quantum efficiency, wherein the technical efforts for providing the charge sharing correction can be relatively low.

3. 发明授权

US10980506B2 Photon-counting computed tomography 有权
公开(公告)号：US10980506B2
公开(公告)日：2021-04-20
申请号：US16305529
申请日：2017-06-29
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Ewald Roessl , Roger Steadman , Christoph Herrmann , Roland Proksa
IPC分类号： A61B6/00 , G01N23/046 , G01N23/083 , G06T11/00
摘要： An image signal processing system (ISP) comprising an input interface (IN) for receiving photon counting projection data acquired by an X-ray imaging apparatus (IA) having a photon counting detector (D). A calibration data memory (CMEM) of the system holds calibration data. The calibration data encodes photon counting data versus path lengths curves for different energy thresholds of i) said detector (D) or ii) of a different detector. At least one of said curves is not one-to-one. A path length convertor (PLC) of the system converts an entry in said photon counting projection data into an associated path length based on said calibration data.

4. 发明授权

US10725188B2 Polarization correction for direct conversion x-ray detectors 有权
公开(公告)号：US10725188B2
公开(公告)日：2020-07-28
申请号：US15762160
申请日：2016-10-11
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Roger Steadman Booker , Ewald Roessl , Heiner Daerr
IPC分类号： G01T7/00 , G01T1/24 , A61B6/00
摘要： Photon-counting x-ray detectors (3) suffer from a degradation of their performance due to polarization. In order to correct the effects of polarization to the generated x-ray images, the invention suggests (i) exposing the radiation detector (3) to a first radiation pulse emitted by a further radiation source (11) and obtaining a first electric pulse signal generated by the radiation detector (3) in response thereto, (ii) later exposing the 5 radiation detector (3) to a second radiation pulse emitted by the further radiation source (11) during the acquisition of the image and obtaining a second electric pulse signal generated by the radiation detector (3) in response thereto, and (iii) comparing amplitudes of the first and second electric pulse signals and generating the x-ray image based on a result of the comparison. The invention provides a corresponding x-ray device and a corresponding method.

5. 发明授权

US10223815B2 Iterative reconstruction method for spectral, phase-contrast imaging 有权
公开(公告)号：US10223815B2
公开(公告)日：2019-03-05
申请号：US15326506
申请日：2015-07-16
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Ewald Roessl , Thomas Koehler
IPC分类号： G06K9/00 , G06T11/00 , A61B6/03 , A61B6/00 , G01N23/20
摘要： A system and related method for X-ray phase contrast imaging. A signal model is fitted to interferometric measurment data. The fitting operation yields a Compton cross section and a photo-electric image. A pro-portionality between the Compton cross section and electron-density is used to achieve a reduction of the number of fitting variables. The Compton image may be taken, up to a constant, as a phase contrast images.

6. 发明授权

US10054692B2 Detector and method for detecting ionizing radiation 有权
公开(公告)号：US10054692B2
公开(公告)日：2018-08-21
申请号：US15536321
申请日：2015-12-11
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Ewald Roessl , Christoph Herrmann , Roger Steadman Booker , Klaus Jürgen Engel
IPC分类号： G01T1/18 , G01T1/24 , G01T1/208 , G01T1/28 , G01T1/36 , G01T1/185
CPC分类号： G01T1/241 , G01T1/185 , G01T1/208 , G01T1/247 , G01T1/28 , G01T1/366
摘要： The present invention relates to a detector (22′) for detecting ionizing radiation, comprising: a directly converting semi-conductor layer (36) for producing charge carriers in response to incident ionizing radiation; and a plurality of electrodes (34) corresponding to pixels for registering the charge carriers and generate a signal corresponding to registered charge carriers; wherein an electrode of the plurality of electrodes (34) is structured to two-dimensionally intertwine with at least two adjacent electrodes to register the charge carriers by said electrode and by at least one adjacent electrode. The present invention further relates to a detection method and to an imaging apparatus.

7. 发明授权

US09833202B2 System for generating spectral computed tomography projection data 有权
公开(公告)号：US09833202B2
公开(公告)日：2017-12-05
申请号：US15108401
申请日：2015-12-01
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Heiner Daerr , Roger Steadman Booker , Gereon Vogtmeier , Ewald Roessl , Gerhard Martens , Carolina Ribbing
IPC分类号： H05G1/26 , A61B6/03 , A61B6/00 , A61B6/06
CPC分类号： A61B6/032 , A61B6/06 , A61B6/4042 , A61B6/4078 , A61B6/4241 , A61B6/482 , A61B6/485 , A61B6/582 , H05G1/30 , H05G1/58
摘要： The invention relates to a system (31) for generating spectral computed tomography projection data. A spectral projection data generation device (6) comprising an energy-resolving detector generates spectral computed tomography projection databased on polychromatic radiation (4), which has been provided by a radiation device (2), after having traversed an examination zone (5), and a reference values generation device generates energy-dependent reference values based on radiation, which has not traversed the examination zone. A spectral parameter providing unit (12) provides a spectral parameter being indicative of a spectral property of the radiation device based on the energy-dependent reference values. In particular, spectral properties of the radiation device can be monitored over time, wherein this information can be used for, for instance, correcting the spectral computed tomography projection data, and/or, if undesired spectral properties of the radiation device are indicated, triggering a replacement of the radiation device.

8. 发明授权

US09782138B2 Imaging apparatus and method 有权
公开(公告)号：US09782138B2
公开(公告)日：2017-10-10
申请号：US15036521
申请日：2015-09-22
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Thomas Koehler , Roland Proksa , Bernhard Johannes Brendel , Ewald Roessl
IPC分类号： A61B6/00 , A61B6/03 , G21K1/02
CPC分类号： A61B6/4291 , A61B6/032 , A61B6/4241 , A61B6/54 , A61B6/542 , G21K1/025
摘要： An imaging apparatus comprising a radiation source (2) for emitting radiation from a focal region (20) through an imaging area (5), a detection unit (6) for detecting radiation from said imaging area (5), said detection unit comprising an anti-scatter grid (62) and a detector (61), a gantry (1) to which said radiation source (2) and said detection unit (6) are mounted and a controller (9) for controlling said detection unit (6) to detect radiation at a plurality of projection positions and for manipulating the position, setting and/or orientation of at least a part of said radiation source (2) and/or said detection unit (6) at first projection positions (80) so that the radiation incident on the detector (61) at said first projection positions is attenuated by said anti-scatter grid (62) to a larger extent compared to second projection positions (80) representing the remaining projection positions.

9. 发明授权

US09730759B2 Spectral imaging based decision support, treatment planning and/or intervention guidance 有权
公开(公告)号：US09730759B2
公开(公告)日：2017-08-15
申请号：US14402121
申请日：2013-05-31
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Carsten Oliver Schirra , Ewald Roessl , Roland Proksa
IPC分类号： G06K9/00 , A61B19/00 , A61B6/03 , A61B6/00 , G06T7/00 , G06T11/00 , A61B34/10
CPC分类号： A61B34/10 , A61B6/032 , A61B6/4042 , A61B6/405 , A61B6/4241 , A61B6/481 , A61B6/488 , A61B6/504 , A61B6/507 , A61B6/5217 , A61B6/5235 , A61B2034/107 , F04C2270/041 , G06T7/0012 , G06T11/005 , G06T2207/10081 , G06T2207/30101 , G06T2211/404
摘要： A method includes obtaining first spectral image data, which includes at least a first component corresponding to a targeted first K-edge based contrast agent administered to a subject if a target of the targeted first K-edge based contrast agent is present in the subject, decomposing the first spectral image data into at least the first component, reconstructing the first component thereby generating a first image of the targeted first K-edge contrast agent, determining if the targeted first K-edge contrast agent is present in the first image, and generating a signal indicating the targeted first K-edge contrast agent is present in the first image in response to determining the targeted first K-edge contrast agent is present in the first image.

10. 发明申请

US20150216499A1 ALIGNING SOURCE-GRATING-TO-PHASE-GRATING DISTANCE FOR MULTIPLE ORDER PHASE TUNING IN DIFFERENTIAL PHASE CONTRAST IMAGING 有权
标题翻译：在不同阶段对比成像中对多个阶段相位调整进行归一化光栅相位刻痕距离
公开(公告)号：US20150216499A1
公开(公告)日：2015-08-06
申请号：US14421008
申请日：2013-08-20
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Gerhard Martens , Heiner Daerr , Thomas Detlef Istel , Ewald Roessl , Udo Van Stevendaal
IPC分类号： A61B6/00
CPC分类号： A61B6/587 , A61B6/484 , A61B6/582 , A61B6/588 , A61B6/589 , G01N23/20025 , G01N23/20075 , G01N2223/643
摘要： The present invention relates handling misalignment in an X-ray imaging system for differential phase contrast imaging. In order to provide a reduction for the pretuning and adjustment requirements for manufacture and maintenance in a differential phase contrast imaging system, an X-ray imaging system (10) for differential phase contrast imaging, is provided that comprises a differential phase contrast setup (12) with an X-ray source (14) and an X-ray detector (16), a grating arrangement (18) comprising a source grating (20), a phase grating (22) and an analyser grating (24), wherein the source grating is arranged between the X-ray source and the phase grating, and the analyser grating is arranged between the phase grating and the detector. Further, a moving arrangement for a relative movement between an object under examination and at least one of the gratings is provided, as well as a processing unit (32), and a translation arrangement (34) for translating the source grating. The phase grating, the analyser grating and the detector are provided as a rigid interferometer unit (36), in which the phase grating and the analyser grating are mounted in parallel to each other. The source grating is misaligned in respect to the interferometer unit such that moiré fringes are detectable in the plane of the detector. The processing unit is configured to detect moiré patterns in signals provided by the detector upon X-ray radiation. The processing unit is further configured to compute a translation signal (38) for translating the source grating for achieving a predetermined moiré pattern. The translation arrangement is configured to adjust the positioning of the source grating at least in the X-ray projection direction (30), based on the value of the translation signal.
摘要翻译：本发明涉及用于微分相位成像的X射线成像系统中的处理未对准。为了降低差分相位成像系统中的制造和维护的预调节和调整要求，提供了用于差分相位成像的X射线成像系统（10），其包括差分相位对比度设置（12 ）与X射线源（14）和X射线检测器（16），包括源光栅（20），相位光栅（22）和分析器光栅（24）的光栅装置（18）源光栅布置在X射线源和相位光栅之间，分析器光栅布置在相位光栅和检测器之间。此外，提供了用于在检查对象和至少一个光栅之间的相对运动的移动装置，以及处理单元（32）和用于平移源光栅的平移装置（34）。相位光栅，分析器光栅和检测器被提供为刚性干涉仪单元（36），其中相位光栅和分析器光栅彼此平行地安装。源光栅相对于干涉仪单元不对准，使得在检测器的平面中可以检测到莫尔条纹。处理单元被配置为在X射线辐射时检测由检测器提供的信号中的莫尔图案。处理单元还被配置为计算用于平移源光栅以实现预定莫尔图案的平移信号（38）。平移装置被配置为至少基于转换信号的值来调整源光栅的至少在X射线投射方向（30）上的定位。

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