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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

JPH02159252A IMAGE RECONSTITUTION METHOD IN MAGNETIC RESONANCE IMAGING APPARATUS 失效
公开(公告)号：JPH02159252A
公开(公告)日：1990-06-19
申请号：JP31390788
申请日：1988-12-14
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG , HITACHI MEDICAL CORP
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： PURPOSE:To obtain a reconstitution image free from blur by performing unidimensional Fourier transform in a longitudinal direction by applying unidimensional Fourier transform in a lateral direction to a detection signal and calculating phase strains different at every lines to tabulate the same or calculating phase strains by the estimation from the detection signal itself to correct the same. CONSTITUTION:Unidimensional Fourier transform in an x-direction is applied to measured data S(x, y) to obtain A(I, y) and a correction coefficient changing dependening on a y-direction. (y) corresponds to phase encoding quantity while the phase encoding quantity changes regularly corresponding to a value of (y). In the correction coefficient, there are two kinds of F(y) being a coefficient wherein a phase linearily changes on an image in an I-direction and G(y) being an offset like coefficient of a phase and the change states of F(y) and G(y) based on phase encoding quantity and the size of an imaging region are calculated to be tabulated and the table is referred to if necessary. Phase correction is performed on the basis of the calculated phase correction coefficient. Unidimensional Fourier transform is applied to calculated data A'(I, y) to obtain an image B(I, y) corrected in blur.

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

DE69328578D1 未知
公开(公告)号：DE69328578D1
公开(公告)日：2000-06-15
申请号：DE69328578
申请日：1993-01-22
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： HOMMA KOICHI , OSHIMA KEIJI , SUEKI MASAO , KASAMA TAKASHI , KAGAWA TOSHIYA
IPC分类号： H04L12/28 , H04Q11/04
摘要： Data communication method and system for transmitting a large amount of data via a network (202) such as LAN to which a plurality of stations or terminals (201, 203, 204, 205) are connected, through a simplified processing procedure with high reliability and high efficiency while suppressing influence to other communications. The large amount of data is transmitted from a sender station to a plurality of receiver stations by utilizing a connectionless communication service, while inter-station reception acknowledging/retransmitting processings are performed by using a connection-oriented communication service. The large amount of data to be transmitted is divided into a plurality of blocks, and inter-block delay time is set on the basis of station status factors such as a permissible load increase rate of the CPU of the individual stations.

6. 发明专利

JPH03155834A MEASURING RANGE LIMITING IMAGING SYSTEM IN MRI INSTRUMENT 失效
公开(公告)号：JPH03155834A
公开(公告)日：1991-07-03
申请号：JP29234589
申请日：1989-11-13
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： KASAMA TAKASHI , SANO KOICHI , TAGUCHI JUNICHI , YOKOYAMA TETSUO
IPC分类号： A61B5/055 , G01R33/48
摘要： PURPOSE:To automatically decide the size of a measuring object and to shorten the measuring time by measuring in advance data for determining a measuring range, determining the measuring range based thereon, measuring it, and reproducing the data. CONSTITUTION:In the case of determining a measuring range, the X direction and the Y direction are set to the read-out direction and the phase encoding direction, respectively, and when a value of phase encoding is '0', a signal is measured. Subsequently, when the obtained measuring signal is brought to one-dimensional Fourier- transformation, projection data in the X direction is obtained. This projection data is equivalent to data for which a value in the Y direction is projected and added, therefore, by executing a threshold processing, a background part and a measuring object in the X direction can be separated. In such a manner, the measuring range which becomes X1-X2 can be determined. Next, as for the measuring range in the Y direction, by switching the Y direction and the X direction to the read-out direction and the phase encoding direction, respectively, the measuring range which becomes Y1-Y2 can be determined in the same manner. By using them, an object is measured and reproduced.

7. 发明专利

JPH04200445A ANGIOGRAM DISPLAY SYSTEM 失效
公开(公告)号：JPH04200445A
公开(公告)日：1992-07-21
申请号：JP32911590
申请日：1990-11-30
申请人： HITACHI LTD , HITACHI MICRO SYSTEM KK , HITACHI MEDICAL CORP
发明人： KASAMA TAKASHI , SANO KOICHI , YOKOYAMA TETSUO , NISHIMURA HIROSHI
IPC分类号： G01R33/32 , A61B5/055 , G01R33/28
摘要： PURPOSE:To correct artifact of a static part by incorporating a matching processing of an amplitude and a phase between images pertaining to a processing which performs a subtraction between the images obtained by reproduction processing from two different kinds of detection signals to extract a blood vessel. CONSTITUTION:Artifact of a static part is corrected utilizing a difference of amplitude to generate an angiogram of high quality. A rephase image R and a dephase image D are inputted. Phases of the phase images R and D inputted are matched. The image with a phase distortion matched is differentiated from the rephase image to determined an angiogram S corrected in phase. This allows the correction of artifact of the static part which is generated from a difference of amplitude at the static part between the rephase image and the dephase image.

8. 发明专利

DE69328578T2 未知
公开(公告)号：DE69328578T2
公开(公告)日：2001-02-01
申请号：DE69328578
申请日：1993-01-22
申请人： HITACHI LTD , HITACHI MICROCOMP ENGINEERING
发明人： HOMMA KOICHI , OSHIMA KEIJI , SUEKI MASAO , KASAMA TAKASHI , KAGAWA TOSHIYA
IPC分类号： H04L12/28 , H04Q11/04
摘要： Data communication method and system for transmitting a large amount of data via a network (202) such as LAN to which a plurality of stations or terminals (201, 203, 204, 205) are connected, through a simplified processing procedure with high reliability and high efficiency while suppressing influence to other communications. The large amount of data is transmitted from a sender station to a plurality of receiver stations by utilizing a connectionless communication service, while inter-station reception acknowledging/retransmitting processings are performed by using a connection-oriented communication service. The large amount of data to be transmitted is divided into a plurality of blocks, and inter-block delay time is set on the basis of station status factors such as a permissible load increase rate of the CPU of the individual stations.

9. 发明专利

JPH05207023A MASS DATA TRANSMITTING METHOD 失效
公开(公告)号：JPH05207023A
公开(公告)日：1993-08-13
申请号：JP1076492
申请日：1992-01-24
申请人： HITACHI LTD , HITACHI MICOM SYST KK
发明人： HONMA KOICHI , OSHIMA KEIJI , SUEKI MASAO , KASAMA TAKASHI , KAGAWA TOSHIYA
IPC分类号： H04L12/28 , H04Q11/04
摘要： PURPOSE:To secure reliability through simple procedure, and in addition, to attain the efficient transmission of mass data by transmitting continuously plural information frames by using a connectionless transmitting means. CONSTITUTION:A system is constituted of a transmitter 201, a physical communication line 202 in which the information frame flows, and receivers 203 to 205. In this case, a means to transmit continuously plural data packets by using the connectionless transmitting means, and after that, execute the reception of a reception confirming packet or a retransmission requesting data packet and the transmission of a retransmitted data packet is provided. Then, the mass data is transmitted by using the efficient connectionless transmitting means in which the reliability is not secured, and after that, the transmission of the reception confirming, the retransmission requesting, and the retransmission requested data is executed by using the connection-oriented transmitting means in which the reliability is secured.

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