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公开(公告)号：US10559393B2
公开(公告)日：2020-02-11
申请号：US15745234
申请日：2016-07-20
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Roland Proksa
IPC: G01T1/20 , G21K1/06 , A61B6/00 , G01N23/041 , G01T7/00
Abstract: The present invention relates to X-ray imaging. In order to reduce X-ray dose exposure during X-ray image acquisition, an X-ray detector is provided that is suitable for phase contrast and/or dark-field imaging. The X-ray detector comprises a scintillator layer (12) and a photodiode layer (14). The scintillator layer is configured to convert incident X-ray radiation (16) modulated by a phase grating structure (18) into light to be detected by the photodiode layer. The scintillator layer comprises an array of scintillator channels (20) periodically arranged with a pitch (22) forming an analyzer grating structure. The scintillator layer and the photodiode layer form a first detector layer (24) comprising a matrix of pixels (26). Each pixel comprises an array of photodiodes (28), each photodiode forming a sub-pixel (30). Adjacent sub-pixels during operation receive signals having mutually shifted phases. The sub-pixels that during operation receive signals having mutually identical phase form a phase group per pixel. The signals received by the sub-pixels within the same phase group per pixel during operation are combined to provide one phase group signal (32). The phase group signals of different phase groups during operation are obtained in one image acquisition. In an example, the pitch of the scintillator channels is detuned by applying a correcting factor c to a fringe period (Pfringe) of a periodic interference pattern (35) created by the phase grating structure, wherein 0
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公开(公告)号：US10269146B2
公开(公告)日：2019-04-23
申请号：US15544092
申请日：2015-12-30
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Roland Proksa , Rafael Wiemker , Liran Goshen , Shlomo Gotman
Abstract: A method displays spectral image data reconstructed from spectral projection data with a first reconstruction algorithm and segmented image data reconstructed from the same spectral projection data with a different reconstruction algorithm, which is different from the first reconstruction algorithm. The method includes reconstructing spectral projection data with the first reconstruction algorithm, which generates the spectral image data and displaying the spectral image data. The method further includes reconstructing the spectral projection data with the different reconstruction algorithm, which generates segmentation image data, segmenting the segmentation image data, which produces the segmented image data, and displaying the segmented image data.
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公开(公告)号：US10143434B2
公开(公告)日：2018-12-04
申请号：US15312372
申请日：2015-05-13
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Roland Proksa , Thomas Koehler
Abstract: The invention relates to an imaging system (17) like a computed tomography system for generating an image of an object. Spectral measured projection data and non-spectral measured projection data are generated by a detector (6) having spectral detection elements and non-spectral detection elements, and spectral estimated projection data are estimated by using a model material distribution which could have caused the non-spectral measured projection data and by simulating a measurement of the spectral estimated projection data based on the model material distribution. An image is reconstructed based on the measured and estimated spectral projection data. Using the spectral estimated projection data in addition to the spectral measured projection data can lead to high quality spectral imaging, especially high quality spectral computed tomography imaging, which uses a simplified detector not only having generally more complex spectral detection elements, but also having simpler non-spectral detection elements.
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公开(公告)号：US09977139B2
公开(公告)日：2018-05-22
申请号：US14408125
申请日：2013-06-20
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Roland Proksa
CPC classification number: G01T7/005 , A61B6/03 , A61B6/4241 , G01T1/17 , G01T1/24
Abstract: An apparatus (T) and method for correcting detector (104) measurement data for errors caused by imperfections in the detector (104) that effect the accuracy of the detector readings.
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公开(公告)号：US09958554B2
公开(公告)日：2018-05-01
申请号：US14359337
申请日：2012-11-23
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Cornelis Reinder Ronda , Roland Proksa , Axel Thran
CPC classification number: G01T1/2002 , G01N23/04 , G01T1/2006 , G01T1/2018 , G01T1/202
Abstract: The invention relates to a detection apparatus for detecting radiation. The detection apparatus comprises a GOS material (20) for generating scintillation light depending on the detected radiation (25), an optical filter (24) for reducing the intensity of a part of the scintillation light having a wavelength being larger than 650 nm, and a detection unit (21) for detecting the filtered scintillation light. Because of the filtering procedure relatively slow components, i.e. components corresponding to a relatively large decay time, of the scintillation light weakly constribute to the detection process or are not detected at all by the detection unit, thereby increasing the temporal resolution of the detection apparatus. The resulting fast detection apparatus can be suitable for kVp-switching computed tomography systems.
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Patent Agency Ranking
公开(公告)号：US09857479B2
公开(公告)日：2018-01-02
申请号：US15041100
申请日：2016-02-11
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Roland Proksa
Abstract: An imaging system (100) includes a direct conversion detector pixel (111) that detects radiation traversing an examination region and generates an electrical signal indicative thereof, wherein the signal includes a persistent current, which is produced by a direct conversion material of the pixel and which shifts a level of the signal. A persistent current estimator (116) estimates the persistent current and generates a compensation signal based on the estimate. A pre-amplifier (112) receives the signal and the compensation signal, wherein the compensation signal substantially cancels the persistent current, producing a persistent current compensated signal, and that amplifies the compensated signal, generating an amplified compensated signal. A shaper (114) generates a pulse indicative of energy of the radiation illuminating the direct conversion material based on the amplified compensated signal.
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公开(公告)号：US09775580B2
公开(公告)日：2017-10-03
申请号：US15519176
申请日：2015-10-12
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Roland Proksa , Thomas Koehler , Michael Grass
CPC classification number: A61B6/5205 , A61B6/032 , A61B6/405 , A61B6/4241 , A61B6/50 , A61B6/503 , A61B6/5258 , A61B6/5288 , A61B6/541
Abstract: A method includes modulating a flux of emission radiation between a first lower flux level and a second higher flux level in coordination with a cardiac cycle signal so that the flux is at the first lower flux level during a first cardiac motion phase having a first higher cardiac motion and is at the second higher flux level during a second cardiac motion phase having a second lower cardiac motion. The method further includes reconstructing the projection data with a first reconstruction window, which applies a first higher weight to a first sub-set of the projection data that corresponds to the first cardiac motion phase and the lower first flux level and a second lower weight to a second sub-set of the projection data that corresponds to the second cardiac motion phase and the higher second flux level, to generate first volumetric image data.
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68.发明授权公开(公告)号：US09405018B2
公开(公告)日：2016-08-02
申请号：US14351892
申请日：2012-10-05
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Roland Proksa
CPC classification number: G01T1/17 , G01N23/04 , G01N23/046 , G01N2223/419
Abstract: A detection apparatus for detecting photons, such as used in radiographic imaging systems includes a detection unit that generates detection signal pulses having a detection signal pulse height being indicative of the energy of the detected photons, a detection values generation unit that generates energy-resolved detection values depending on the detection signal pulses and a signal pulse generation unit that generates artificial signal pulses having a predefined artificial signal pulse height and a predefined generated rate. The detection values generation unit determines an observed rate of the artificial signal pulses having an artificial signal pulse height being larger than a predefined threshold as observed by the detection values generation unit and determines an offset of the detection signal pulses depending on the determined observed rate. This allows reliably determining the offset of the detection signal pulses, which can be used for correcting the finally generated detection values.
Abstract translation: 用于检测诸如用于放射线照相成像系统中的光子的检测装置包括：检测单元，其生成检测信号脉冲，其具有指示检测到的光子的能量的检测信号脉冲高度;检测值生成单元，其生成能量分辨检测 取决于检测信号脉冲的值和产生具有预定的人工信号脉冲高度和预定的生成速率的人造信号脉冲的信号脉冲产生单元。 检测值生成单元确定由检测值生成单元观察到的具有大于预定阈值的人造信号脉冲高度的人造信号脉冲的观察速率，并且根据确定的观察速率确定检测信号脉冲的偏移。 这允许可靠地确定检测信号脉冲的偏移，其可以用于校正最终产生的检测值。
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公开(公告)号：US09262825B2
公开(公告)日：2016-02-16
申请号：US14407971
申请日：2013-06-13
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Hanno Heyke Homann , Roland Proksa
CPC classification number: G06T7/0012 , G06K9/52 , G06K9/6267 , G06T5/001 , G06T11/008 , G06T2211/436
Abstract: The present invention discloses a method for reconstructing an image obtained from kVp switched imaging of a body by acquiring a plurality of images at a first kVp defining a first image scan and a plurality of images at a second kVp defining a second image scan, wherein the plurality of images at the first kVp are acquired interleaved with the plurality of images of the second image scan and by reconstructing an image from the first and second image scan, comprising determining at least one gradient location for at least two images in the first and second image scans, determining divergent gradient locations in respect of a same part of the body for said at least two images in the first and second image scans, tagging each divergent gradient location as an under sampling artifact, generating the reconstructed image from the at least two images in the first and second image scans by correcting for each tagged under sampling artifact. The invention further discloses an imaging system for imaging at least a part of a body by means of a first image scan and a second image scan and a computer program product.
Abstract translation: 本发明公开了一种用于通过以限定第一图像扫描的第一kVp和在限定第二图像扫描的第二kVp处的多个图像获取多个图像来重建从主体的kVp切换成像获得的图像的方法，其中， 获取与第一图像扫描的多个图像交错的第一kVp处的多个图像，并且通过重建来自第一和第二图像扫描的图像，包括确定第一和第二图像中的至少两个图像的至少一个梯度位置 图像扫描，确定在第一和第二图像扫描中所述至少两个图像相对于身体的相同部分的发散梯度位置，将每个发散梯度位置标记为欠采样伪影，从至少两个图像生成重建图像 通过校正每个被标记的采样伪像，在第一和第二图像扫描中的图像。 本发明还公开了一种用于通过第一图像扫描和第二图像扫描以及计算机程序产品对身体的至少一部分进行成像的成像系统。
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公开(公告)号：US20150248782A1
公开(公告)日：2015-09-03
申请号：US14433750
申请日：2013-10-02
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Roland Proksa
CPC classification number: G06T11/60 , A61B6/4014 , A61B6/4241 , A61B6/463 , A61B6/482 , A61B6/5217 , G06T5/002 , G06T5/50 , G06T2207/10004 , G06T2207/10081 , G06T2207/20221
Abstract: A method includes generating a first measurement spectral image from first spectral image data based on a predetermined measurement energy. The method further includes determining a first measurement value for a first region of interest in the first measurement spectral image. The method further includes overlying the first measurement value in connection with a corresponding first region of interest in a visually presented first display spectral image, wherein the measurement energy is different from a first display energy of the first display spectral image.
Abstract translation: 一种方法包括基于预定的测量能量从第一光谱图像数据生成第一测量光谱图像。 该方法还包括确定第一测量光谱图像中第一感兴趣区域的第一测量值。 该方法还包括在视觉呈现的第一显示光谱图像中叠加与第一感兴趣区域相对应的第一测量值，其中测量能量与第一显示光谱图像的第一显示能量不同。
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