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1. 发明专利

JPS63102748A TELEVISION TOMOGRAPHIC IMAGING APPARATUS 失效
公开(公告)号：JPS63102748A
公开(公告)日：1988-05-07
申请号：JP24751286
申请日：1986-10-20
申请人： HITACHI MEDICAL CORP
发明人： ODA KAZUYUKI , HAMAYA KAZUHIKO
IPC分类号： G01N23/04 , A61B6/02 , A61B6/03

2. 发明专利

JPS62189582A CT IMAGE ALIGNING SYSTEM 失效
公开(公告)号：JPS62189582A
公开(公告)日：1987-08-19
申请号：JP3089086
申请日：1986-02-17
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： MORISHITA KOICHI , YOKOYAMA TETSUO , HAMAYA KAZUHIKO , SATO KAZUHIRO
IPC分类号： A61B6/02 , A61B6/03 , G06T1/00 , G06T15/08
摘要： PURPOSE:To obtain a high picture quality three-dimensional re-constitution image by extracting a position deviation vector in a position deviation detecting area set optionally between adjoining slices, smoothing the extracted position deviation vector in the slicing direction, thereafter, using the vectors before the smoothing and after the smoothing and executing the registration processing such as polynomial approximation. CONSTITUTION:When a position dislocation occurs, position deviation detecting areas 201 and 211 are set to adjoining slicing images 20 and 21, and the relative position deviation of central picture element 202 and 212 of respective areas is extracted. Concretely, while moving the area 201 in the area 211, a position deviation vector 32 is obtained by a template matching method, etc. For a full line graph 43 obtained by arranging the detected position deviation vector by obtaining the (x) component of the vector for the ordinate and a slicing position (slice No.) for the abscissa, a smoothing processing is executed, and the smooth position deviation vector is obtained like a dotted line 42. As the smoothing system at such a time, the processing to remove a peculiar action such as points 44 and 45 is executed.

3. 发明专利

JPS63290548A DIGITAL TOMOGRAPHIC IMAGING APPARATUS 失效
公开(公告)号：JPS63290548A
公开(公告)日：1988-11-28
申请号：JP12583087
申请日：1987-05-25
申请人： HITACHI MEDICAL CORP
发明人： HAMAYA KAZUHIKO
IPC分类号： A61B6/02 , G01N23/04
摘要： PURPOSE:To form a three-dimensional tomographic image, by taking out two sets of projection data corresponding to the parts, which are mutually opposed so as to provide an interval therebetween, on the moving locus of a radiation detector and forming two tomographic images for left and right eye images. CONSTITUTION:The radiation from a radiation source 1 is incident to a radiation detector 3 through an object 2 to be examined and converted to an electric signal by an image pickup tube 4. The radiation source 1 and the radiation detector 3 are relatively moved so as to draw a closed loop curve having parts, wherein the respective moving loci in planes mutually parallel in positional relation are opposed to each other so as to provide an interval therebetween, in said mutually parallel planes. The output of the image pickup tube 4 is inputted to a memory apparatus 6 through an A/D converter 5. An operation apparatus 7 forms tomographic images for left and right eye images from the projection data stored in the memory apparatus to apply the same to a display apparatus 8.

4. 发明专利

JPS63222247A CORRECTION OF IMAGE DISTORTION 失效
公开(公告)号：JPS63222247A
公开(公告)日：1988-09-16
申请号：JP5408887
申请日：1987-03-11
申请人： HITACHI MEDICAL CORP
发明人： HAMAYA KAZUHIKO
IPC分类号： G01N23/04 , A61B6/00 , G03B42/02
摘要： PURPOSE:To achieve a highly accurate correction of an image distortion, by a method wherein a member low in the radiation absorption coefficient is combined flat with a member high in the coefficient so as to arrange numerous imaging points of a member intended to measure distortion in scattered dots and a distortion measuring phantom thus formed is processed through photography. CONSTITUTION:A member low in the radiation absorption coefficient is combined flat with a member high in the coefficient so as to arrange numerous imaging points of a member intended to measure distortion in scattered dots, a phantom intended to measure distortion is photographed as the object and an image signal thus obtained undergoes a filter processing 2. An imaging portion of the number intended to measured distortion extracted is processed 3 on a threshold basis to define parts above a certain level as imaging point areas, the gravity center in which is determined to detect 4 distortion imaging points of the member intended to measure distortion. Then, true imaging points for image formation are set 5 for the member intended to measure distortion and then, distortion coordinates of a desired pixel except for points of the member intended to measure distortion are determined from the true image points and the distortion imaging points by interpolation processing. Then, a distortion correction table is prepared and recorded 7 from the results of computation and is used to correct an image distortion.

5. 发明专利

JPS62189587A HIGH SPEED SYSTEM FOR IMAGE EMPHASIZING PROCESSING 失效
公开(公告)号：JPS62189587A
公开(公告)日：1987-08-19
申请号：JP3088986
申请日：1986-02-17
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： MORISHITA KOICHI , YOKOYAMA TETSUO , HAMAYA KAZUHIKO , OKABE TETSUO
IPC分类号： G06T5/20
摘要： PURPOSE:To execute high speed processing by extracting the local characteristic of an image with a concentration value statistic and selecting a weighting function in accordance with a local characteristic. CONSTITUTION:At the time of the weighted average, instead of making all picture element points in a window as a calculating object, by executing suitability the thinning and processing in accordance with a window size, in case, the image size, which is especially an object, is large, the window size comes to be also large, and therefore, substitution can be executed by the average of the thinned picture element point. Instead of executing the weighted average of all windows with the same weighting function, by changing over the weighting function in accordance with the local characteristic, the average in the most part of the window can be executed by a simple average calculation according to the image. Concretely, when the weighted average of a central picture element 32 is obtained, a slanting line part 310 only is calculated and the calculation of the white part 320 is omitted. At a window 410 which is not influenced, the simple average processing may be executed and the weighted average may be obtained only for an area 420 with a large influence.

6. 发明专利

JPS63230151A MEASURING PHANTOM FOR RADIATION IMAGE PICKUP APPARATUS 失效
公开(公告)号：JPS63230151A
公开(公告)日：1988-09-26
申请号：JP6399787
申请日：1987-03-20
申请人： HITACHI MEDICAL CORP
发明人： HAMAYA KAZUHIKO
IPC分类号： A61B6/00

7. 发明专利

JPS63168153A DIGITAL TOMOGRAPHIC IMAGING APPARATUS 失效
公开(公告)号：JPS63168153A
公开(公告)日：1988-07-12
申请号：JP31016586
申请日：1986-12-29
申请人： HITACHI MEDICAL CORP
发明人： HAMAYA KAZUHIKO , KAMIYA MASAMI
IPC分类号： G01N23/04 , A61B6/02 , G09G5/36

8. 发明专利

JPS62114069A SYSTEM FOR EXECUTING IMAGE ENHANCING AT HIGH SPEED 失效
公开(公告)号：JPS62114069A
公开(公告)日：1987-05-25
申请号：JP25279685
申请日：1985-11-13
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： MORISHITA KOICHI , HAMAYA KAZUHIKO , YOKOYAMA TETSUO , OKABE TETSUO
IPC分类号： G06T5/00
摘要： PURPOSE:To decrease the number of times of an operation by calculating a local statistic with respect to a reduced image which has thinned out an original image, executing an interpolation processing as for an omitted part, and magnifying it to the original one. CONSTITUTION:An original image (2048X2048) is thinned out by a thinning-out rate 4, and a reduced original image of 512X512 is obtained. With respect to the reduced original image, a window is set, and a local statistic of a weighted average, etc. is calculated. A value of each point is obtained thereby, and a coordinate is multiplied by four, and returned to its original one. As for an omitted part (round mask), an operation quantity is obtained by a small interpolation. As a result, an edge part becomes dull (a line 63) in accordance with a thinning-out rate, but it is better than a result (a chain line 64) of a simple average in which the window is 100.

9. 发明专利

JPS63222210A IMAGE DISTORTION MEASURING PHANTOM 失效
公开(公告)号：JPS63222210A
公开(公告)日：1988-09-16
申请号：JP5408987
申请日：1987-03-11
申请人： HITACHI MEDICAL CORP
发明人： HAMAYA KAZUHIKO
IPC分类号： G01B15/00 , A61B6/00 , G01N11/00 , G01N23/04 , G03B42/02
摘要： PURPOSE:To measure image distortion with high accuracy, by arranging spherical distortion measuring members having high radiation absorptivity and a small diameter to the surface or interior of a plate-shaped support member, which has low radiation absorptivity and high rigidity, in a lattice pattern. CONSTITUTION:A rectangular support member 7 is formed of a material having low radiation absorptivity and high rigidity, for example, a synthetic resin or an acrylic resin. A large number of distortion measuring members 8 are arranged to the surface of interior of the support member 7 in a lattice pattern so that an adjacent interval (d) is provided by required quantity to form an image distortion measuring phantom 6. Each of the distortion measuring members 8 is formed of a material having high radiation absorptivity, for example, a small steel sphere. The diameter of the small sphere is set to about 0.1-5mm and the interval (d) is set to about 5-50mm. Points A'-D' where an image is formed in a distorted state are detected by an image intensifier using the phantom 6 as an object to irradiate the same with radioactive rays from a radiation source and converting said rays to visible light to be compared with points A-D where an image is supposed to be originally formed and image distortions P1-P4 are measured. By this method, image distortion is measured with high accuracy.

10. 发明专利

JPS6392337A TELEVISION TOMOGRAPHIC IMAGING APPARATUS 失效
公开(公告)号：JPS6392337A
公开(公告)日：1988-04-22
申请号：JP23627286
申请日：1986-10-06
申请人： HITACHI MEDICAL CORP
发明人： ODA KAZUYUKI , KAMIYA MASAMI , HAMAYA KAZUHIKO
IPC分类号： A61B6/02 , G01N23/04

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