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11. 发明专利

AT373287T 未知
公开(公告)号：AT373287T
公开(公告)日：2007-09-15
申请号：AT02769527
申请日：2002-05-07
申请人： KONINKL PHILIPS ELECTRONICS NV
发明人： TIMMER JAN
IPC分类号： A61B6/03 , G06T11/00 , G01N23/04 , G06T1/00
摘要： A computed-tomography system comprises a data-processing system arranged to receive attenuation profiles for respective orientations. A lowest representative noise level of the individual attenuation profiles is determined The attenuation profiles are filtered in dependence of said lowest representative noise level. In particular it is achieved that the filtered attenuation profiles have the lowest maximum noise level among the received attenuation profiles.

12. 发明专利

DE69932037D1 未知
公开(公告)号：DE69932037D1
公开(公告)日：2006-08-03
申请号：DE69932037
申请日：1999-12-09
申请人： KONINKL PHILIPS ELECTRONICS NV
发明人： WILTING E , TIMMER JAN
IPC分类号： G01R33/32 , G06T7/60 , A61B5/055 , A61B6/03 , A61B8/00 , A61B8/06 , G06T1/00

13. 发明专利

DE69717780D1 未知
公开(公告)号：DE69717780D1
公开(公告)日：2003-01-23
申请号：DE69717780
申请日：1997-07-04
申请人： KONINKL PHILIPS ELECTRONICS NV
发明人： TIMMER JAN
IPC分类号： A61B6/03 , G06T1/00 , G06T5/00 , G06T11/00
摘要： A computer tomography device is provided with a reconstruction unit (1) for deriving brightness values of an image from density values. An image processing system (2) for deriving corrected brightness values from the brightness values of the image is arranged to calculate the variation of brightness values of the image in the radial direction and in the tangential direction. The image processing system is also arranged to calculate the deviation between the variation in the radial direction and the variation in the tangential direction and to derive corrected brightness values from brightness values of the image and the deviation.

14. 发明专利

DE69424746T2 未知
公开(公告)号：DE69424746T2
公开(公告)日：2000-12-28
申请号：DE69424746
申请日：1994-11-03
申请人： KONINKL PHILIPS ELECTRONICS NV
发明人： TIMMER JAN
IPC分类号： A61B6/03 , G06T11/00
摘要： A patient (7) is irradiated by an X-ray source (1) in a computed tomography apparatus. The radiation is subsequently detected by the detector cells (5) of a position-sensitive X-ray detection system (4) and the intensities detected are applied to a computing device (16). Absorption as well as elastic and inelastic scattering of X-rays occur within the patient (7). The data acquired is corrected for elastic (coherent) scatter by deriving a deconvolution function from the elastic scatter function, which deconvolution function is applied to the data. The elastic scatter function is determined, for example by a computer simulation.

15. 发明专利

RU2526877C2 СПОСОБ КАЛИБРОВКИ НА ОСНОВЕ АЛГОРИТМА НАХОЖДЕНИЯ ЦЕНТРА ВРАЩЕНИЯ ДЛЯ КОРРЕКЦИИ КОЛЬЦЕВЫХ АРТЕФАКТОВ В НЕИДЕАЛЬНЫХ ИЗОЦЕНТРИЧЕСКИХ ТРЕХМЕРНЫХ ВРАЩАТЕЛЬНЫХ РЕНТГЕНОВСКИХ СКАНИРУЮЩИХ СИСТЕМАХ С ИСПОЛЬЗОВАНИЕМ КАЛИБРОВОЧНОГО ФАНТОМА 未知
公开(公告)号：RU2526877C2
公开(公告)日：2014-08-27
申请号：RU2011107936
申请日：2009-08-11
申请人： KONINKL PHILIPS ELECTRONICS NV
发明人： NORDKHUK NIKOLAS J , TIMMER JAN
IPC分类号： A61B6/00
摘要： Изобретениеотноситсяк трехмернымвращательнымрентгеновскимсредствамполученияизображениядляиспользованияв компьютернойтомографии. Способпредварительнойкалибровкидляпредотвращениявозникновения, посуществу, круговыхкольцевыхартефактовпритрехмернойреконструкцииизображенияв неидеальнойизоцентрическойтрехмернойвращательнойрентгеновскойсканирующейсистемесостоитв сканированиикалибровочногофантомаприперемещениирентгеновскойтрубкии рентгеновскогодетекторавдольнеидеальнокруговойтраектории, вычислениидлякаждогопроекционногонаправлениятрехмерногоположенияфокальногопятнарентгеновскойтрубкии трехмерногоположенияцентрарентгеновскогодетектораизполученныхдвумерныхпроекционныхизображенийфантома, иопределенииизнаборагеометрическихкалибровочныхданных, получаемыхв результатепроцедурытрехмернойкалибровки, выполняемойнаосновевычисленныхтрехмерныхпозиционныхданных, трехмерныекоординатыэффективногоцентравращения, вокругкоторогоможетсчитатьсявращающейсянеидеальноизоцентрическаятрехмернаявращательнаярентгеновскаясканирующаясистема. Трехмернаявращательнаярентгеновскаясканирующаясистемас C-образнымкронштейномсодержитблоккалибровкидляспособакалибровкии дополнительноблокреконструкциидляспособареконструкции. Считываемыйкомпьютеромносительсодержиткоманды, которыепозволяютосуществлятькалибровкуи реконструкциюнатрехмернойвращательнойрентгеновскойсканирующейсистеме. Длякалибровкисканирующейсистемыилитрехмернойреконструкцииизображенияприменяюттрехмерныекоордин

16. 发明专利

DE602004011620T2 未知
公开(公告)号：DE602004011620T2
公开(公告)日：2009-01-29
申请号：DE602004011620
申请日：2004-07-16
申请人： KONINKL PHILIPS ELECTRONICS NV
发明人： TIMMER JAN
IPC分类号： G06T5/00 , G06T11/00
摘要： An artifact correcting image reconstruction apparatus includes a reconstruction processor ( 70 ) that reconstructs acquired projection data ( 60 ) into an uncorrected reconstructed image ( 74 ). A classifying processor ( 78 ) classifies pixels of the uncorrected reconstructed image ( 74 ) at least into high, medium, and low density pixel classes. A pixel replacement processor ( 88 ) replaces pixels of the uncorrected reconstructed image ( 74 ) that are of the high density and low density classes with pixel values of the low density pixel class to generate a synthetic image ( 90 ). A forward projecting processor ( 94 ) forward projects the synthetic image ( 90 ) to generate synthetic projection data ( 96 ). A projection replacement processor ( 100, 110 ) replaces acquired projection data ( 60 ) contributing to the pixels of the high density class with corresponding synthetic projection data ( 96 ) to generate corrected projection data ( 112 ). The reconstruction processor ( 70 ) reconstructs the corrected projection data ( 112 ) into a corrected reconstructed image ( 120 ).

17. 发明专利

DE60222412T2 未知
公开(公告)号：DE60222412T2
公开(公告)日：2008-06-19
申请号：DE60222412
申请日：2002-05-07
申请人： KONINKL PHILIPS ELECTRONICS NV
发明人： TIMMER JAN
IPC分类号： A61B6/03 , G06T11/00 , G01N23/04 , G06T1/00
摘要： A computed-tomography system comprises a data-processing system arranged to receive attenuation profiles for respective orientations. A lowest representative noise level of the individual attenuation profiles is determined The attenuation profiles are filtered in dependence of said lowest representative noise level. In particular it is achieved that the filtered attenuation profiles have the lowest maximum noise level among the received attenuation profiles.

18. 发明专利

DE69728397D1 未知
公开(公告)号：DE69728397D1
公开(公告)日：2004-05-06
申请号：DE69728397
申请日：1997-11-10
申请人： KONINKL PHILIPS ELECTRONICS NV
发明人： TIMMER JAN
IPC分类号： A61B6/03 , G06T11/00

19. 发明专利

DE69424746D1 未知
公开(公告)号：DE69424746D1
公开(公告)日：2000-07-06
申请号：DE69424746
申请日：1994-11-03
申请人： KONINKL PHILIPS ELECTRONICS NV
发明人： TIMMER JAN
IPC分类号： A61B6/03 , G06T11/00
摘要： A patient (7) is irradiated by an X-ray source (1) in a computed tomography apparatus. The radiation is subsequently detected by the detector cells (5) of a position-sensitive X-ray detection system (4) and the intensities detected are applied to a computing device (16). Absorption as well as elastic and inelastic scattering of X-rays occur within the patient (7). The data acquired is corrected for elastic (coherent) scatter by deriving a deconvolution function from the elastic scatter function, which deconvolution function is applied to the data. The elastic scatter function is determined, for example by a computer simulation.

20. 发明专利

DE69840290D1 未知
公开(公告)号：DE69840290D1
公开(公告)日：2009-01-15
申请号：DE69840290
申请日：1998-05-25
申请人： KONINKL PHILIPS ELECTRONICS NV
发明人： WILTING JANTJE EDITH , TIMMER JAN , DE BROUWER FRANSISCA MARIA
IPC分类号： A61B6/03 , A61B6/00 , H05G1/30 , H05G1/46
摘要： A computer tomography device includes an X-ray source (1) and an X-ray detection system (3) for forming a number of density profiles of an object to be radiologically examined. A reconstruction unit (4) derives an image signal from the density profiles. A control system (20) adjusts the X-ray source (1) on the basis of a density value of the object and the control system is arranged to adjust the X-ray source on the basis of a part of the object to be examined. The control system is also arranged to adjust the X-ray source on the basis of a reference adjustment of the X-ray source. The reference adjustment is dependent on the part of the object to be examined.

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