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公开(公告)号：US20180217071A1
公开(公告)日：2018-08-02
申请号：US15505199
申请日：2015-12-23
发明人： Zhiqiang Chen , Li Zhang , Le Shen , Qingping Huang , Xin Jin
IPC分类号： G01N23/046
CPC分类号： G01N23/046 , G01N23/041 , G01N2223/1016 , G01N2223/419
摘要： An X-ray imaging system and method are provided. The system may include: an X-ray source configured to irradiate X-ray beams; a first grating and a second grating arranged sequentially in an irradiation direction of the X-ray beams; a detector arranged at downstream of the second grating in the irradiation direction; and a controller and data processing device configured to control the X-ray source to irradiate the X-ray beams, to control the detector to receive X-ray beams passing through the first grating and the second grating to generate phase contrast information and/or dark field information, and to perform CT check on an object under check based on the phase contrast information and/or the dark field information to obtain a CT image. In this way, it is possible to obtain more characteristic information about the object under check, so as to achieve more precise material recognition and security check.
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公开(公告)号：US09885801B2
公开(公告)日：2018-02-06
申请号：US14748407
申请日：2015-06-24
发明人： Zhiqiang Chen , Li Zhang , Xin Jin , Qingping Huang , Le Shen , Yunda Sun
CPC分类号： G01V5/0041 , A61B6/4266 , G01T1/202 , G01T1/362 , G01T7/08 , G01V5/005
摘要： The present disclosure discloses a detector device comprising a plurality of detector assemblies. Each detector assembly comprises at least one detection crystal units having a first energy response and those having a second energy response, which are both arranged along a first direction at intervals, each detection crystal unit having a first/second energy response including at least one detection crystals having a first/second energy response arranged along a second direction. The at least one detection crystal units having a first energy response and the at least one detection crystal units having a second energy response are, at least partially, alternatively arranged along the first direction when viewed from an incidence direction of the X-ray. The present disclosure also discloses a dual energy CT system having the detector device and a CT detection method using this system.
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公开(公告)号：US09773326B2
公开(公告)日：2017-09-26
申请号：US14751044
申请日：2015-06-25
发明人： Li Zhang , Xin Jin , Qingping Huang , Yunda Sun
CPC分类号： G06T11/003 , A61B6/032 , A61B6/5205 , A61B6/583 , G01N23/046 , G01V5/0041 , G01V5/005 , G06T2207/10081
摘要： The present invention provides a CT image calibration method and device and a CT system. The method includes: arranging a fixed calibration element at the outside of a channel area and within the maximal reconstruction area of a CT scanning device, and storing the theoretical value of the fixed calibration element; collecting the projection data of the fixed calibration element to obtain the actual reconstructed image of the fixed calibration element; and comparing the actual reconstructed image with the stored corresponding theoretical value, to establish a mapping function for correcting the actual reconstructed image into the theoretical value. By adopting the present invention, the calibration quality can be effectively improved, the image calibration effect is enhanced, the reliability of the CT scanning device is improved and the maintenance cost is saved, thus the practical application value is very high.
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公开(公告)号：US20150332486A1
公开(公告)日：2015-11-19
申请号：US14708866
申请日：2015-05-11
发明人： Li Zhang , Zhiqiang Chen , Le Shen , Yuxiang Xing , Xin Jin , Qingping Huang
CPC分类号： G06T11/006 , A61B6/027 , A61B6/032 , A61B6/4085 , A61B6/4266 , A61B6/5205 , G06T7/0012 , G06T2207/10081 , G06T2207/30004 , G06T2211/421
摘要： The present disclosure discloses a spiral CT system and a reconstruction method thereof. In some embodiments, it is proposed that data missing due to a large pitch is compensated by weighting the complementary projection data of the projection data obtained using the spiral CT system. After the data is complemented, the projection data is rebinned as cone parallel beam data, cone-angle cosine weighting and one-dimensional filtering are implemented on the rebinned data, and parallel beam back projection is finally implemented on the filtered data, to obtain the reconstructed images. In some embodiments, with the above method, the speed of the belt can be increased by more than one time in a case that the existing area of the detectors and the existing speed of the slip ring are unchanged, thereby improving the pass rate of the luggage and maintaining the quality of the reconstructed images unchanged.
摘要翻译： 本公开公开了一种螺旋CT系统及其重建方法。 在一些实施例中，提出通过对使用螺旋CT系统获得的投影数据的互补投影数据进行加权来补偿由于大音调而丢失的数据。 数据补充后，将投影数据重新设置为锥形平行光束数据，对重定位数据进行锥角余弦加权和一维滤波，最后在滤波数据上实现平行光束反投影，获得 重建图像。 在一些实施例中，利用上述方法，在检测器的现有区域和滑环的现有速度不变的情况下，带的速度可以增加多于一次，从而提高了传感器的通过率 行李保持重建图像的质量不变。
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公开(公告)号：US10295481B2
公开(公告)日：2019-05-21
申请号：US15262894
申请日：2016-09-12
发明人： Zhiqiang Chen , Li Zhang , Tianyi Yang Dai , Ji Zhao , Xin Jin , Ming Chang
IPC分类号： G01N23/20 , G01N23/00 , G01N23/046 , G01N23/083 , G01N23/207 , G21K1/02 , G01V5/00
摘要： The present disclosure relates to detection systems and methods. One illustrative detection system may include a distributed radiation source having a plurality of radiation source focus points, which irradiate an object under detection, wherein the plurality of radiation source focus points are divided into a certain number of groups, and a primary collimator that limits rays of each of the radiation source focus points such that the rays emit into an XRD detection device. An XRD detection device may include a plurality of XRD detectors that are divided into the same number of groups as the radiation source focus points, wherein XRD detectors in a same group are arranged to be separated by XRD detectors in other groups, and rays of each of the radiation source focus points are received by XRD detectors having the same group number as the group number of the radiation source focus point.
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公开(公告)号：US10267752B2
公开(公告)日：2019-04-23
申请号：US15328437
申请日：2015-11-02
发明人： Li Zhang , Zhiqiang Chen , Xiaolei Jiang , Xiaohua Zhu , Xin Jin
IPC分类号： G01N23/04 , G01N23/046
摘要： The present disclosure relates to X-ray imaging systems and methods. An exemplary system may comprise a distributed X-ray source arrangement, a fixed grating module, an X-ray detecting device, and a computer workstation. In one illustrative implementation, X-ray sources of the distributed incoherent X-ray source arrangement may sequentially generate and emit X-rays to an object to be detected. Further, for each exposure, the X-ray detecting device may receive the X-rays, wherein after a series of stepping exposures and corresponding data acquisitions, at each pixel of the X-ray detecting device, X-ray intensities are represented as an intensity curve; the intensity curve may be compared to an intensity curve in the absence of the object to be detected, and a pixel value at each pixel may be obtained from a variation of the intensity curves; and image information of the object to be detected may be obtained according to such pixel values.
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公开(公告)号：US09784883B2
公开(公告)日：2017-10-10
申请号：US14577069
申请日：2014-12-19
发明人： Zhiqiang Chen , Li Zhang , Qingping Huang , Yunda Sun , Xin Jin , Tao Yang , Le Shen , Ji Zhao
CPC分类号： G01V5/0041 , G01N23/046 , G01T1/2985 , G01V5/005
摘要： Multi-spectral static CT apparatuses are disclosed. The apparatus includes a ray source in a form of multiple distributed spots, multiple columns of detectors, a data acquisition device, an article carrying and control device, and a multi-spectral projection data processing device. An object of the present disclosure is to combine static CT scanning technology with multi-spectral analysis technology. It has an advantage of a static CT system, such as high scanning speed, simple mechanic structure, and/or cost reduction due to omission of slip ring. It also can perform identification of material in an article, and can be widely applied in occasions such as safety inspection, and smuggling suppression at customs.
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公开(公告)号：US09746579B2
公开(公告)日：2017-08-29
申请号：US14576737
申请日：2014-12-19
发明人： Li Zhang , Zhiqiang Chen , Qingping Huang , Xin Jin , Yunda Sun , Le Shen , Ji Zhao
CPC分类号： G01V5/005 , G01N23/046 , G01T7/08 , G06T11/003 , G06T2207/10072 , G06T2211/40
摘要： A CT system and method thereof are disclosed. The system includes: a conveyor mechanism; a first scanning stage configured to scan the object and generate a first digital signal; a second scanning stage spaced from the first scanning stage at a preset distance in a direction of the object's movement; a processing device configured to reconstruct a CT image of the object at a first image quality based on the first digital signal, and analyze the CT image; and a control device configured to adjust a scanning parameter of the second scanning stage based on an analysis result of the processing device to cause the second scanning stage to output a second digital signal. The processing device reconstructs a CT image of the object at a second image quality higher than the first image quality at least based on the second digital signal. The system takes full advantage of the distributed ray sources which replace the normal slip ring technology.
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公开(公告)号：US11340177B2
公开(公告)日：2022-05-24
申请号：US15733630
申请日：2020-01-20
发明人： Zhiqiang Chen , Li Zhang , Zhenhua Zhao , Yunda Sun , Xin Jin , Wuyang Liang
摘要： Disclosed are calibration assembly and calibration method of calibrating geometric parameters of a CT apparatus. The calibration assembly includes at least one calibration unit each including a plurality of calibration wires, and the plurality of calibration wires are arranged regularly in a same plane. The calibration assembly is easy to be processed and can be used to calibrate geometric parameters of a CT apparatus, and the calibration operations are simple and easy to be implemented.
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公开(公告)号：US10379067B2
公开(公告)日：2019-08-13
申请号：US15257595
申请日：2016-09-06
发明人： Zhiqiang Chen , Li Zhang , Tianyi Yang Dai , Ji Zhao , Xin Jin , Ming Chang
IPC分类号： G01N23/00 , G01N23/046 , G01N23/20 , G21K1/02 , G01V5/00
摘要： Systems and methods for liquid detection are disclosed. An illustrative method for liquid detection herein may include implementing CT imaging and XRD imaging on one or more liquid planes of liquid contained in a container at once by rotating the container so that X-rays from a same radiation source scan a whole area of each of the one or more liquid planes, and generating a substance identification result for the liquid contained in the container based on a CT image and a XRD image, wherein the CT imaging and the XRD imaging are implemented on a same liquid plane or different liquid planes. Consistent with various aspects and features, implementations may identify substances contained in the liquid more quickly and accurately.
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