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1. 发明专利

DE3941188C2 未知
公开(公告)号：DE3941188C2
公开(公告)日：1997-03-06
申请号：DE3941188
申请日：1989-12-13
申请人： HITACHI LTD , HITACHI MEDICAL CORP , HITACHI MICROCUMPUTER ENG
发明人： KASAMA TAKASHI , MAEDA AKIRA , YOKOYAMA TETSUO , NISHIMURA HIROSHI
IPC分类号： G01R33/54 , A61B5/055 , G01R33/32 , G01R33/565 , G01N24/08
摘要： An image reconstruction method for a magnetic resonance imaging device is disclosed, by which phase distortions of a magnetic resonance signal are stored in the form of a table prepared previously, by using a phase encode amount and an imaging region size as parameters; the phase distortions of the magnetic resonance signal are corrected on the basis of the phase distortions stored in the table for the measured magnetic resonance signal or the phase distortions varying for every line are presumed from the difference in the phase between the phase of hypothetical data including no phase distortions and the phase of measured data; and the phase distortions of the measured magnetic resonance signal are corrected by using this presumed value.

2. 发明专利

DE3941188A1 未知
公开(公告)号：DE3941188A1
公开(公告)日：1990-06-28
申请号：DE3941188
申请日：1989-12-13
申请人： HITACHI LTD , HITACHI MEDICAL CORP , HITACHI MICROCUMPUTER ENG
发明人： KASAMA TAKASHI , MAEDA AKIRA , YOKOYAMA TETSUO , NISHIMURA HIROSHI
IPC分类号： G01R33/54 , A61B5/055 , G01R33/32 , G01R33/565
摘要： An image reconstruction method for a magnetic resonance imaging device is disclosed, by which phase distortions of a magnetic resonance signal are stored in the form of a table prepared previously, by using a phase encode amount and an imaging region size as parameters; the phase distortions of the magnetic resonance signal are corrected on the basis of the phase distortions stored in the table for the measured magnetic resonance signal or the phase distortions varying for every line are presumed from the difference in the phase between the phase of hypothetical data including no phase distortions and the phase of measured data; and the phase distortions of the measured magnetic resonance signal are corrected by using this presumed value.

3. 发明专利

JPH03224537A PLURAL SLICE SIMULTANEOUSLY MEASURING METHOD 失效
公开(公告)号：JPH03224537A
公开(公告)日：1991-10-03
申请号：JP1904990
申请日：1990-01-31
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： TAGUCHI JUNICHI , SANO KOICHI , YOKOYAMA TETSUO , KAJIYAMA KOJI
IPC分类号： A61B5/055 , G01R33/48
摘要： PURPOSE:To eliminate uneven density by adding newly to apply an inclined magnetic field by an equal quantity each between specific pulses or between the specific pulse and read-out of a signal, and varying one of the magnitude or the direction of the newly added inclined magnetic field between adjacent slices. CONSTITUTION:A high frequency magnetic field 101 generates two kinds of 90 deg. and 180 deg. pulses from a high frequency magnetic field generating device 204. An inclined magnetic field generating device 203 generates a slice direction inclined magnetic field 102, an encoding direction inclined magnetic field, 103, and a read-out direction inclined magnetic field 104, controls the strength of three kinds of magnetic field and superposes them, and generates the inclined magnetic fields in the slice direction, the encoding direction and the read-out direction having an arbitrary cross section. In the case of two slices, an additional part 106 in the slice direction, an additional part 107 in the encoding direction and an additional part 108 in the read-out direction are added to a second slice. Also, in the case the number of slices is >=2, the inclined magnetic field is added newly by an equal quantity each between the 90 deg. pulse and the 180 deg. pulse and between the 180 deg. pulse and read-out of a signal to the sequence of each slice. In such a way, uneven density of an image can be erased.

4. 发明专利

JPH0221845A PHASE DISTORTION CORRECTING METHOD IN MAGNETIC RESONANCE IMAGING DEVICE 失效
公开(公告)号：JPH0221845A
公开(公告)日：1990-01-24
申请号：JP17092888
申请日：1988-07-11
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG , HITACHI MEDICAL CORP
发明人： MAEDA AKIRA , KASAMA TAKASHI , YOKOYAMA TETSUO , NISHIMURA HIROSHI
IPC分类号： A61B5/05 , G01R33/28 , G01R33/54
摘要： PURPOSE:To lessen a large non-linear phase distortion of the whole complex image by setting an partial region (block) of an arbitrary form on a reconstructed complex image, and dividing the complex image into blocks. CONSTITUTION:In a rotary recovery method which is one of imaging methods in the magnetic resonance imaging, image C'1k=(C1k) where reconstructed image containing phase distortion is squared is calculated. An absolute value for C'1k is taken and the maximum value (CMAX) is calculated. C'1k is divided into blocks C'mno. The size of the block is decided so that the change of the phase distortion is kept within the range of + or -pi if possible. For example, in case of an original image of 256X256 picture elements, if it is divided into 4X4 blocks, the block size is 64X64. The number of elements to satisfy CMAX.TH (predetermined threshold value) in C'mn and the predetermined number of picture elements are compared and decided which is larger, and when M>(the number of picture elements satisfying CMAX.TH), the block C'mn is Fourier transformed to obtain B'xy. The absolute value of B'xy is taken to calculate the coordinate (x', y') of the maximum value. Further, the phase angle A in (x', y') is calculated.

5. 发明专利

JPS6470874A IMAGE RETRIEVING SYSTEM 失效
公开(公告)号：JPS6470874A
公开(公告)日：1989-03-16
申请号：JP22631287
申请日：1987-09-11
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： MORISHITA KOICHI , YOKOYAMA TETSUO , SATO KAZUHIRO
IPC分类号： G06F17/27 , G06F17/30
摘要： PURPOSE:To attain retrieval based upon the contents of diagnosis and to improve the flexibility and efficiency of image retrieval by displaying on optional constitutional element of each item of a retrieving information file and allowing an operator to specify an optional subset in the constitutional element. CONSTITUTION:When information relating to the contents of an image indicated in a block 12 is included in a retrieving item 112 of a retrieving file 11 in case of retrieving a specific image by means of the file 11 relating to an image group 10, the contents of the block 12 are displayed and the operator selects one of the subsets shown by 121-123. Since the subsets 121-123 usually include independent expression in each person, each set is converted into standardized expression to be treated by a data base by conversion processing 13 and processed results 131-133 are obtained. Finally, synonyms are retrieved from the processed results 131-133 by processing 14 and these retrieved synonyms are used as keys for retrieving the data base to execute key retrieval 15 and the image concerned is displayed.

6. 发明专利

JPS6470028A SHADING SYSTEM OF THREE-DIMENSIONAL IMAGE 失效
公开(公告)号：JPS6470028A
公开(公告)日：1989-03-15
申请号：JP22631387
申请日：1987-09-11
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： MORISHITA KOICHI , YOKOYAMA TETSUO , TAKAGI HIROSHI
IPC分类号： A61B6/03 , G01N23/04 , G06T15/80
摘要： PURPOSE:To enhance the image quality of a three-dimensional image by remov ing an artifact, by extracting the inclination of the adjacent point of a distance image becoming a basis and adaptably changing the size of the surface bonded to a surface for calculating a normal line vector corresponding to said inclina tion. CONSTITUTION:The inclination of the adjacent point of a distance image formed of the triangle surface 112 bonded to a surface 11 for calculating a normal line vector 111 is suitably changed corresponding to said inclination. When the inclination of the aforementioned adjacent point is small, the inclination with a further separated point is calculated and the size of the triangle surface is widened until exceeds a threshold value set beforehand. For example, when the inclination with the just adjacent point exceeds the threshold value, the triangle surface of the min. size set beforehand is supposed. Since change of the normal line vector 111 determining shading can be made smooth, the image quality of an obtained three-dimensional image is enhanced.

7. 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.

8. 发明专利

JPS60171573A PICTURE EMPHASIS SYSTEM IN PICTURE PROCESSING SYSTEM 失效
公开(公告)号：JPS60171573A
公开(公告)日：1985-09-05
申请号：JP2716984
申请日：1984-02-17
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： MORISHITA KOUICHI , YOKOYAMA TETSUO , YAMAGATA NOBUTAKE , GOTOU YOSHIHIRO
IPC分类号： A61B6/00 , G06Q50/22 , G06Q50/24 , G06T5/00 , G06T5/40 , G09G5/36 , G16H10/60
摘要： PURPOSE:To enable overall, effective picture emphasis processing by dividing original picture data into a partial picture, by selecting an optimum filter for every divided area and making it work, and by adding a processed picture at optional ratio. CONSTITUTION:Original picture data 21 is divided into a part picture, and characteristic extraction processing 22 of respective part areas whose characteristics as variance values are extracted from a small area for every part is performed. Next, the optimum processing among a filtering treatment 23, original picture adding treatment 25 and a contrast conversion treatment 27 emphasizing a specific frequency component is performed by using a transcendental known information 201, for example, a diagnosed part location, diagnosis object, etc. Further, by using the information 201, a filter function selection treatment 24 of a filter to be used for the treatment 23, a processed picture addition coefficient setting treatment 26 for the treatment 25, and a contrast conversion function selection treatment 28 for the treatment 27 is performed respectively. In this way, by using various processing means and adding the processed pictures at optional ratio, the system can overall, effective picture emphasis processing.

9. 发明专利

JPS59137942A Picture positioning system 失效
标题翻译：图像定位系统
公开(公告)号：JPS59137942A
公开(公告)日：1984-08-08
申请号：JP1216783
申请日：1983-01-28
申请人： Hitachi Ltd , Hitachi Medical Corp
发明人： MORISHITA KOUICHI , OOMORI SHINJI , YAMAGATA NOBUTAKE , YOKOYAMA TETSUO , SANO KOUICHI , OOGUSHI AKIRA
IPC分类号： G03B42/02 , A61B6/00 , G01T1/164 , G06K9/64 , G06T3/00 , G06T5/00
CPC分类号： G06T3/0081 , G06K9/6203 , G06T5/006
摘要： PURPOSE:To perform high-precision picture positioning by dividing an X-ray image before or after the injection of an image forming agent into plural blocks, and performing coordinate conversion, block by block. CONSTITUTION:A mask picture T0 and a live picture T1 are each divided into N blocks, and corresponding block pictures are processed in parallel by processor elements PE#1-PE#N. The reference point of data on the picture T1 divided into blocks is extracted and an image processor performs the coordinate conversion by the least square method on the basis of the calculated reference point data. Each processor element uses a spline function and performs smoothly so that the coordinate value varies smoothly between blocks. Subtraction between the coordinate-converted pictures T1 and T0 is performed to extract a blood vessel part, obtaining a clear picture.
摘要翻译：目的：通过将图像形成剂注入之前或之后的X射线图像分割成多个块来执行高精度图像定位，并且逐块执行坐标转换。构成：将掩模图像T0和实时图像T1分别划分成N个块，对应的块图像由处理器单元PE＃1-PE＃N并行处理。提取分割为块的图像T1的数据参考点，并且图像处理器基于所计算的参考点数据，通过最小二乘法执行坐标转换。每个处理器元件使用样条函数并且平滑地执行，使得坐标值在块之间平滑地变化。执行坐标转换图像T1和T0之间的减法以提取血管部分，获得清晰的图像。

10. 发明专利

JPS5946947A Scanning speed control system of ct apparatus 失效
标题翻译： CT设备扫描速度控制系统
公开(公告)号：JPS5946947A
公开(公告)日：1984-03-16
申请号：JP15675082
申请日：1982-09-10
申请人： Hitachi Ltd , Hitachi Medical Corp
发明人： YOKOYAMA TETSUO , MORISHITA KOUICHI , SANO KOUICHI , YAMAGAKE NOBUTAKE , YANAKA SHIGENOBU
IPC分类号： A61B6/03 , A61B6/02 , G01T1/161 , G01T1/164

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