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81. 发明专利

JPH03228745A MRI DEVICE 失效
公开(公告)号：JPH03228745A
公开(公告)日：1991-10-09
申请号：JP2546490
申请日：1990-02-05
申请人： TOSHIBA CORP
发明人： YOSHIDA TOMOYUKI
IPC分类号： A61B5/055 , A61B5/0456 , G01R33/28 , G01R33/32 , G01R33/567
摘要： PURPOSE:To obtain the superior MR image synchronized with the heart beat by reducing the erroneous output operation of the synchronization signal by removing the RF noise by a noise removing means, even if the RF noise is mixed into the electrocardio wave obtained from a living body. CONSTITUTION:An MRI device for forming an MR image synchronized with the heart beat of a living body P is equipped with an electrocardio wave detection part 8 for detecting the electrocardio wave Wh of the living body P, sampling hold circuit 9 for outputting the electrocardio wave Wh' of the analogue signal from which RF noise is removed by the sampling or holding of the electrocardio wave Wh which is sent from the electric wave detecting part 8, and a synchronizing circuit 11 which outputs the QRS pulse Pr as synchronous signal on the basis of the output wave shape Dh of an A/D converter 10 which digital-converts the above-described electrocardio wave Wh'. Accordingly, even if the RF noise is mixed into the electrocardio wave detected by the detection part 8, the sampling holding circuit 9 removes the RF noise from the electrocardio wave, and since the synchronous circuit 11 outputs a synchronous signal on the basis of the electrcardio wave from which the RF noise is removed, the erroneous output operation of the synchronous signal is reduced, and the superior MR image synchronized with the heart beat can be detected.

82. 发明专利

JPH0352740B2 失效
公开(公告)号：JPH0352740B2
公开(公告)日：1991-08-12
申请号：JP18701886
申请日：1986-08-11
申请人： GEN ELECTRIC
发明人： NOBAATO JOSEFU PERUKU , GARII HARORUDO GUROOBAA
IPC分类号： A61B10/00 , A61B5/055 , G01N24/08 , G01R33/48 , G01R33/567 , G06T1/00

83. 发明专利

JPH03131238A MAGNETIC RESONANCE IMAGE FORMATION 失效
公开(公告)号：JPH03131238A
公开(公告)日：1991-06-04
申请号：JP21362090
申请日：1990-08-10
申请人： PICKER INT INC
发明人： RICHIYAADO SUKOTSUTO HINKUSU
IPC分类号： A61B5/055 , A61B5/0456 , G01R33/28 , G01R33/48 , G01R33/567
摘要： PURPOSE: To enable image formation at any part of a heartbeat period by giving a preliminary control pulse behind an image formation sequence, and executing each image formation sequence during a cycle following a cycle including a preliminary control pulse. CONSTITUTION: A heart timing means C monitors the heartbeat period of a subject, and controls an image pickup sequence control means 24 and a state control pulse means 34 following the image pickup sequence control means. The state control pulse is a reverse pulse, to which the duration preliminarily selected after the preceding Rayleigh wave is applied, and the magnetic resonance echo data is collected in the progress of an image formation area by use of high frequency and gradient pulse of an image pickup sequence. In the individual heartbeat periods, after the Rayleigh wave where preliminary control pulses corresponding to the next image formation area and the heartbeat period follow, the image formation sequence is first applied. Thus, image formation is enabled at any part of the heartbeat period.

84. 发明专利

JPH01299544A MRI PHOTOGRAPHING METHOD 失效
公开(公告)号：JPH01299544A
公开(公告)日：1989-12-04
申请号：JP12993788
申请日：1988-05-27
申请人： HITACHI LTD
发明人： KOIZUMI HIDEAKI , TAKEDA RYUSABURO , SANO KOICHI , YOKOYAMA TETSUO
IPC分类号： A61B10/00 , A61B5/055 , G01R33/48 , G01R33/563 , G01R33/567
摘要： PURPOSE:To enable safe imaging of the coronary arteries to be performed uninvasively by when liquid in a detected body stagnates in a predetermined location, exciting the location and detecting a resonance signal emitted from an excited spin in the liquid, when it moves to the other location. CONSTITUTION:The spin in a blood vessel, staying, for instance, in the main artery cavity of the heart, is excited by the magnetic resonance. Since a magnetic resonance signal is emitted for a relaxing time from the spin in the blood vessel inflowing to the coronary arteries from the main artery cavity, this magnetic resonance signal is used drawing a blood flow path. This pulse sequence first irradiates a 90 deg. pulse 607 of high frequency after a delay time d618 from an electrocardiogram R wave 617. Simultaneously, an inclined magnetic field pulse 610 in a direction Z is applied. Next after the time 1/2TE, a 180 deg. pulse 608 is irradiated, simultaneously an inclined magnetic field pulse 612 in a direction Y is applied. The time TE thereafter, again irradiating the 180 deg. pulse 608, simultaneously an inclined magnetic field pulse in a direction X is applied. Further the time 1/2TE thereafter, a spin echo signal 609 is generated. Here in the direction Z, an inclined magnetic field pulse 615 is applied.

85. 发明专利

JPH01254156A BODY MOTION CORRECTION IMAGING SYSTEM 失效
公开(公告)号：JPH01254156A
公开(公告)日：1989-10-11
申请号：JP7800788
申请日：1988-04-01
申请人： HITACHI LTD
发明人： SANO KOICHI , YOKOYAMA TETSUO , KOIZUMI HIDEAKI
IPC分类号： G01R33/54 , A61B5/055 , A61B10/00 , G01R33/28 , G01R33/32 , G01R33/567
摘要： PURPOSE:To exactly obtain moving amount in the respective parts of a body from projecting data by selecting one set of the projecting data as reference data and obtaining correlation between these reference data and the respective projecting data. CONSTITUTION:A uniform magnetostatic field is generated by a magnetostatic field generating system 201 and a high frequency pulse to excite a spin is generated by a transmission system 202. Then, an oblique magnetic field to change the strength of the magnetic field to a linear shape is generated by an oblique magnetic field generating system 203. An outgoing magnetic wave to be generated from a checked body is received in a receiving system 204 and A/D converted. Then, the wave is inputted to a processor 205. This processing unit 205 measures information concerning the motion of a breath at the time of photographing and the two types of information, in which picture signals are different. Then, based on correlation value between the information concerning the motion, the moving amount is obtained and the picture signal is corrected. The corrected picture signal is supplied to a CRT 206 and displayed.

86. 发明专利

JPH01148250A MAGNETIC RESONANCE EXAMINATION APPARATUS 失效
公开(公告)号：JPH01148250A
公开(公告)日：1989-06-09
申请号：JP30703087
申请日：1987-12-04
申请人： HITACHI LTD
发明人： ARITOMI TOSHIAKI
IPC分类号： A61B10/00 , A61B5/0456 , A61B5/055 , G01R33/48 , G01R33/567
摘要： PURPOSE:To obtain a sharp image by performing the excitation of a spin at a constant interval considering the recovery state of a longitudinal relaxing time, by determing a repeated time and the number of images to obtain the nuclear magnetic resonance signal of an object to be examined. CONSTITUTION:An electrocardiographic waveform is inputted and the R-wave thereof is differentiated to be inputted to a pulse circuit to obtain an R-wave trigger. The gate between R wave-R wave is opened using the R-wave trigger to output a constant interval signal being a reference clock pulse. In such a case that a repeated time is set, the number of first images possible by the electrocardiographic waveform are obtained from the preliminarily inputted first repeated time and said constant interval signal by operation. When the number of the first images are more than the preset necessary number of the second images, the excitation of a spin and the collection of a magnetic resonance signal are performed with respect to the number of the second images and only the excitation of the spin is performed with respect to the remaining number of images, that is, the number of images obtained by subtracting the number of the second images from the number of the first images. Further, in such a case that the number of images are set, the preliminarily inputted number of the third image sheets and the constant interval signal are inputted to obtain the second repeated time by operation.

87. 发明专利

JPS63300750A METHOD FOR REDUCING ARTIFICIAL EFFECT OF IMAGE 失效
公开(公告)号：JPS63300750A
公开(公告)日：1988-12-07
申请号：JP12606888
申请日：1988-05-25
申请人： GEN ELECTRIC
发明人： GARII HARORUDO GUROOBAA , NOOBAADO JIYOSEFU PERUKU , JIEEMUZU RATSUSERU MAKUFUOORU
IPC分类号： G01R33/54 , A61B5/055 , A61B10/00 , G01R33/32 , G01R33/567

88. 发明专利

JPS63102751A METHOD FOR MEASURING MOLECULAR DIFFUSION AND/OR INFUSION PARAMETER OF LIVING BODY TISSUE 失效
公开(公告)号：JPS63102751A
公开(公告)日：1988-05-07
申请号：JP24056987
申请日：1987-09-25
申请人： THOMSON CGR
发明人： DOUNI RU BIAN , ERIKU BURUTON
IPC分类号： A61B5/055 , G01R33/48 , G01R33/563 , G01R33/567

89. 发明专利

JPS62129040A NMR IMAGING APPARATUS AND METHOD 失效
公开(公告)号：JPS62129040A
公开(公告)日：1987-06-11
申请号：JP23020886
申请日：1986-09-30
申请人： UNIV CALIFORNIA
发明人： KAUFMAN LEON , CROOKS LAWRENCE E , ORTENDAHL DOUGLAS A
IPC分类号： A61B10/00 , A61B5/055 , G01R33/48 , G01R33/54 , G01R33/56 , G01R33/561 , G01R33/567

90. 发明专利

JPS62106755A MAGNETIC RESONANCE IMAGING APPARATUS 失效
公开(公告)号：JPS62106755A
公开(公告)日：1987-05-18
申请号：JP24779985
申请日：1985-11-02
申请人： TOSHIBA CORP
发明人： SUZUKI HIROKAZU , MACHIDA YOSHIO , YUASA YUJI
IPC分类号： A61B10/00 , A61B5/055 , G01R33/28 , G01R33/48 , G01R33/54 , G01R33/567

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