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51. 发明专利

JP2004057438A Three-dimensional x-ray measuring apparatus 有权
公开(公告)号：JP2004057438A
公开(公告)日：2004-02-26
申请号：JP2002219184
申请日：2002-07-29
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： BABA RIKA , UEDA TAKESHI
IPC分类号： G21K5/02 , A61B6/00 , G21K5/10
摘要： PROBLEM TO BE SOLVED: To provide a three-dimensional X-ray measuring apparatus, established without any obstacle to the existing radiotherapy apparatus, endoscope surgical treatment apparatus and thighbone digging apparatus.
SOLUTION: This 3-dimensional X-ray measuring apparatus is composed of an X-ray source for generating X rays, an X-ray detector 102 for detecting X-rays transmitted through an object 123, a support rod 103 supporting the above, and a strut 104 having a rotary mechanism for rotating the support rod 103. A center line 106 connecting between the X-ray source and the center of the detecting surface of the X-ray detector is inclined to the rotation axis 105 of the support rod 103.
COPYRIGHT: (C)2004,JPO

52. 发明专利

JP2003033344A X-ray rotary photographing apparatus using 2- dimensional x-ray detector 审中-公开
标题翻译：使用2-尺寸X射线探测器的X射线摄影摄影装置
公开(公告)号：JP2003033344A
公开(公告)日：2003-02-04
申请号：JP2001220089
申请日：2001-07-19
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： OMI YASUO , UEDA TAKESHI
IPC分类号： A61B6/02 , A61B6/00
摘要： PROBLEM TO BE SOLVED: To provide an X-ray rotary photographing apparatus using a 2-dimen sional X-ray detector that can obtain high quality images by improving S/N of reorganized images without increasing a gross X-ray exposure quantity illumi nated to a subject to be examined by optimizing an input signal level to the 2-dimensional X-ray detector in each photographing angle.
SOLUTION: The apparatus is equipped with an operation part having an external input device to input not only setting and enumerations of photographing conditions, but also a variety of operation commands. Rotary photographing is carried out on the basis of such photographing parameters set by the operation part. From a preliminary photographing parameter which is obtained in a preliminary photographing before the regular photographing and a photographing parameter for the regular photographing which is inputted from the external input device, an initial value of the photographing parameter is obtained 303 by an arithmetic unit of the operation part, and such initial value of the photographing parameter is set to perform a rotary photographing 304.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：提供一种使用二维X射线检测器的X射线旋转拍摄装置，其可以通过改善重组图像的S / N而不增加总体X射线曝光量而获得高质量图像通过在每个拍摄角度中优化对二维X射线检测器的输入信号电平来检查被摄体。解决方案：该装置配备有具有外部输入装置的操作部件，不仅输入拍摄条件的设置和枚举，还输入各种操作命令。基于由操作部设定的拍摄参数进行旋转拍摄。从在正常拍摄之前的初步拍摄中获得的初步拍摄参数和从外部输入装置输入的用于常规拍摄的拍摄参数，通过操作的运算单元303获得拍摄参数的初始值部分，并且设置拍摄参数的这种初始值以执行旋转拍摄304。

53. 发明专利

JP2002301058A X-RAY CT APPARATUS 失效
公开(公告)号：JP2002301058A
公开(公告)日：2002-10-15
申请号：JP2001106039
申请日：2001-04-04
申请人： HITACHI MEDICAL CORP
发明人： TSUNOMURA TAKAYOSHI , UEDA TAKESHI
IPC分类号： A61B6/03 , G06T1/00
摘要： PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus capable of reducing artifact even if reconstituted three-dimensional image processing using projection data of less than 360 degrees is performed by a C arm type circulator X-ray diagnosis device. SOLUTION: This CT apparatus holds a two-dimensional imaging means including a rotation means around a subject, a conical X-ray irradiation means, and a two-dimensional X-ray detection means, and projection data of the subject imaged by the two-dimensional imaging means is processed by an image processing device. This image processing device is provided with a limit angle reconstitution computing means for reconstituting and computing projection data of a projection angle being less than whole periphery, a threshold value extraction means for extracting a reprojection region from a limit angle reconstitution image, an insufficient angle reprojection means for calculating reprojection data of an angle being less than whole periphery from an extracted image, an insufficient angle reconstitution computing means for performing reconstitution and computation using the reprojection data, and a reconstitution image addition means for adding the generated limit angle reconstitution image and an insufficient angle reconstitution image. Consequently, it is possible to obtain three-dimensional reconstitution image having reduced artifact even if the projection data being less than 360 degrees is used.

54. 发明专利

JP2000217810A CONE BEAM CT DEVICE 失效
公开(公告)号：JP2000217810A
公开(公告)日：2000-08-08
申请号：JP2164799
申请日：1999-01-29
申请人： HITACHI MEDICAL CORP
发明人： BABA RIKA , UEDA TAKESHI
IPC分类号： A61B6/03
摘要： PROBLEM TO BE SOLVED: To eliminate movement of an object by splitting a radioscopic image into plural sets different from each other, and generating an X-ray tomographic image or a three-dimensional image according to the radioscopic image set with the maximum sharpness at every X-ray distributed image among radioscopic image images reconfigured in every set. SOLUTION: According to a control signal from a control collecting device 109, measurement of a radioscopic image is started, and a rotating device 108 is rotated. When the angle of rotation reaches a designated angle, an X-ray generator 101 radiates X-rays, and the transmitted X-rays are measured by a two-dimensional radioscopic image detecting device 102 to form an image. A control collecting device 109 collects the radioscopic image with an angle of rotation, that is, a projection angle of the rotating device 108 to be stored in a storing device. Subsequently, gamma correction, image distortion correction, logarithmic conversion, and correction for uneven sensitivity of a two-dimensional detector are made by a processing display device 110, and then a three- dimensional X-ray distribution image is formed and displayed. Thus, the movement of an object in the course of photographing can be eliminated.

55. 发明专利

JPH119585A X-RAY IMAGER 失效
公开(公告)号：JPH119585A
公开(公告)日：1999-01-19
申请号：JP16970497
申请日：1997-06-26
申请人： HITACHI MEDICAL CORP
发明人： KAWAI HIROYUKI , UEDA TAKESHI , MIYAZAKI YASUSHI
IPC分类号： A61B6/03
摘要： PROBLEM TO BE SOLVED: To make possible to improve the resolution of an X-ray image in the direction of the axis of rotation by arranging a detection area regulating means that makes the detection area of X-ray smaller than the X-ray detection window of an X-ray cell and making the opening width of the detection area regulating means a value expressed by a specified formula. SOLUTION: A subject 4 is moved in the z direction of the axis of rotation by controlling the movement mechanism of a bed 5 synchronously with a scan driving section 3, the detection of projection data at different imaging positions that is called helical scan is carried out, projection data detected with a multilayer detector 2 are collected by a data collecting means 7. Here, imaging is made on the assumption that the moving speed of the bed 5 is s, the opening width in the direction of the axis of rotation of a detector cell (detector element) is d, the arrangement pitch of detector cells on the multilayer detector 2 in the direction of the axis of rotation is p, the number of layers is n, the opening width d is set to (n-1)

56. 发明专利

JPH10192267A X-RAY UNIT 失效
公开(公告)号：JPH10192267A
公开(公告)日：1998-07-28
申请号：JP498697
申请日：1997-01-14
申请人： HITACHI MEDICAL CORP
发明人： BABA RIKA , UEDA TAKESHI
IPC分类号： H05G1/64 , A61B6/00 , A61B6/03
摘要： PROBLEM TO BE SOLVED: To distribute X-ray dose so as to increase S/N of the three dimensional image of the target area of a subject against the identical X-ray total sum, by controlling the radiation dose so as to obtain an X-ray image with a prescribed X-ray relative noise value based on an image intensity within a prescribed area of the X-ray image. SOLUTION: An X-ray controller 611 is connected to an image data collecting high speed imaging control circuit system 603 and an X-ray tube 612 and supplies X-ray tube supply voltage to the X-ray tube 312 based on a control signal from the image data collecting high speed imaging control circuit system 603. The image data collecting high speed imaging control circuit system 603 collects an X-ray image converted into digital signals, calculates the imaging condition, controls a rotation gantry 604, an optical system diaphragm 634, a TV camera 624, and an X-ray controller 611, and controls the irradiation dose so as to obtain an X-ray image with a prescribed X-ray relative noise value based on the image intensity within a prescribed area of the X-ray image.

57. 发明专利

JPH1033520A CONE BEAM X-RAY TOMOGRAPHY SYSTEM 失效
公开(公告)号：JPH1033520A
公开(公告)日：1998-02-10
申请号：JP19308696
申请日：1996-07-23
申请人： HITACHI MEDICAL CORP
发明人： BABA RIKA , UEDA TAKESHI , UEKI HIRONORI
IPC分类号： A61B6/03
摘要： PROBLEM TO BE SOLVED: To improve picture quality and the quantitativeness of a CT value by finding the close of X-rays absorbed in a reagent and the thickness of an X-ray absorber plate for equalizing the dose of absorbed X-rays, comparing this thickness with predetermined absorber thickness, finding the ratio of scattered X-ray component and correcting the scattered X-rays of a two-dimensional X-ray image based on this ratio. SOLUTION: Offset level correction and diffused light correction processing is performed to a reagent projecting image C0, and a diffused light corrected image C3 is formed. On the other hand, a diffused light corrected image D3 is prepared from an air projecting image D0. Next, a reagent sensitivity distribution corrected image C5 is prepared by subtracting the logarithmic image of air from the logarithmic image of reagent. A distortion corrected image C6 is prepared by applying geometrical distortion correction to this image C5. A scattered X-ray component image C7 is found by convolving scattered X-ray distribution into this image C6. A scattered X-ray corrected image C8 is prepared by subtracting this image C7 from the distortion corrected image C6. Thus, distortion and sensitivity distribution or the like can be corrected and picture quality and CT value quantitativeness can be improved.

58. 发明专利

JPH09327453A X-RAY DIAGNOSTIC APPARATUS 失效
公开(公告)号：JPH09327453A
公开(公告)日：1997-12-22
申请号：JP15096596
申请日：1996-06-12
申请人： HITACHI MEDICAL CORP
发明人： UEKI HIRONORI , UEDA TAKESHI , BABA RIKA
IPC分类号： A61B6/03
摘要： PROBLEM TO BE SOLVED: To enable to photograph an X-ray image with a sight angle larger than that of an X-ray detector making a subject stand still, by rotating an X-ray projecting means and an X-ray radiography means around the subject and changing the relative position of the X-ray projecting means to the X-ray radiography means. SOLUTION: In a case to take a skiagraphic image or a fluoroscopic image, or to measure an X-ray CT value from a plural directions, a photographing system comprising an X-ray tube 1 and an X-ray detector facing the X-ray tube 1a is rotated around a subject 11 and simultaneously fluoroscopy, skiagraphy, or X-ray CT measurement is carried out changing the relative position of the X-ray tube 1 and the X-ray detector toward a direction parallel with a rotation plane of the photographing system. Following to that, a fluoroscopic image is synthesized from a fluoroscopic image in a case the angle of the X-ray tube 1 with a subject 11 is equal. Thereby, since a fluoroscopic image in a range wider than that of the X-ray detector can be obtained, the CT image of a fluoroscopic image or a skiagraphic image can be enlarged.

59. 发明专利

JPH08332191A DEVICE AND METHOD FOR DISPLAYING THREE-DIMENSIONAL IMAGE PROCESSING 失效
公开(公告)号：JPH08332191A
公开(公告)日：1996-12-17
申请号：JP14298195
申请日：1995-06-09
申请人： HITACHI MEDICAL CORP
发明人： BABA RIKA , UEDA TAKESHI , UMETANI KEIJI
IPC分类号： G01N23/04 , A61B5/055 , A61B6/03 , A61B6/12 , A61B17/00 , A61B19/00 , G06T1/00
摘要： PURPOSE: To facilitate the operation of a member for treatment and to exactly perform it by generating a tomographic image including a three-dimensional position and its nearby position on three-dimensional image information from the two-dimensional image position of an examinee including the member for treatment, and displaying it together with the member for treatment. CONSTITUTION: An output from an image collector 5 is inputted to an image processor 6 and at the image processor 6, respective pieces of image information successively provided from a two-dimensional radiograph detector 4 following the move of the member for treatment are reconstructed into three-dimensional image information by its arithmetic unit based on angle information from a rotary plate angle measuring mechanism 10. That image information is stored in a memory and based on a command due to input from an input device 6A, a two-dimensional image for observing the three-dimensional image information is read out of the memory. This read two-dimensional image is displayed on a display device 6B. Besides, three-dimensional information, into which the information of various markers is integrated, is displayed on a display device 6C.

60. 发明专利

JPH08163441A X-RAY RADIOGRAPHING DEVICE 失效
公开(公告)号：JPH08163441A
公开(公告)日：1996-06-21
申请号：JP30384994
申请日：1994-12-07
申请人： HITACHI MEDICAL CORP
发明人： KAJIYAMA TOMOHARU , UEDA TAKESHI
IPC分类号： H05G1/64 , A61B6/00 , H04N5/321
摘要： PURPOSE: To measure nonlinearity of a sensitivity characteristics with high accuracy by using a sensitivity characteristic curve representing the camera operation mode and the multiplication factor so as to correct a camera output signal in a way that image density and intensity of X-ray have a linear relation. CONSTITUTION: The device is provided with a sensitivity characteristic measurement light source 5 to set optionally radiation light intensity in a noticed area of a camera image pickup pattern and with a sensitivity characteristic evaluation device 9 which measures plural combinations of intensity of the light source 5 and camera signal output when the camera operation mode and the multiplication factor are designated and uses the measurement data to record the sensitivity characteristic curve of the device to be calculated by using the measured data to a recording medium 10. The camera output signal is corrected in a way that the image density and the intensity of X-ray have a predetermined relation by using the sensitivity characteristic curve between the camera operation mode and the multiplication factor among sensitivity characteristic data. Then the sensitivity characteristic measurement light source 5 is controlled by a light source controller 8 and the sensitivity characteristic is evaluated while adjusting the light quantity made incident on the image pickup element to evaluate the nonlinearity with high accuracy.

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