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1. 发明专利

JPH08280653A MAGNETIC RESONANCE IMAGING APPARATUS 失效
公开(公告)号：JPH08280653A
公开(公告)日：1996-10-29
申请号：JP744796
申请日：1996-01-19
申请人： UNIV CALIFORNIA
发明人： REON KAUFUMAN
IPC分类号： A61B5/055 , G01R33/385
摘要： PROBLEM TO BE SOLVED: To minimize an acoustic noise generated in an MRI imaging domain by providing a gradient magnetic field coil former supporting a gradient magnetic field coil and a lattice which is fixed to the gradient magnetic field coil former and has a plurality of interconnected ribs forming a web. SOLUTION: A gradient magnetic field coil 14 in X direction, a gradient magnetic filed coil 15 in Y direction, and a gradient magnetic field coil 16 in Z direction are mutually provided within a single cylindrical unit as a liner, mounted or formed to a gradient magnetic field coil former. The radiant magnetic field coil and the gradient magnetic field coil former form the single cylindrical unit adapted to an interior of a static magnetic field coil 10 and a cylindrical MRI housing 12. A lattice 40 is completely molded by the gradient magnetic field coil former and includes a web 42 forming geometric rectangle patterns by mutually connecting a plurality of ribs 45.

2. 发明专利

JPH0678895A MAGNETIC RESONANCE IMAGING GENERATING STRONG AUXILIARY GRADIENT MAGNETIC PULSE BY USING AUXILIARY INSERTING GRADIENT MAGNETIC COIL 失效
公开(公告)号：JPH0678895A
公开(公告)日：1994-03-22
申请号：JP2525293
申请日：1993-02-15
申请人： UNIV CALIFORNIA
发明人： REON KAUFUMAN , JIYOSEFU DABURIYU KAARUSON , HEKUTAA II EIBURAMU
IPC分类号： A61B5/055 , G01R33/34 , G01R33/381 , G01R33/385 , G01R33/389 , G01R33/38
摘要： PURPOSE: To improve the performance of an MRI system at comparatively low additional cost by enabling use of both an ordinary large size gradient magnetic field coil and a small size additional gradient magnetic field coil in an ordinary MRI sequence. CONSTITUTION: An additional gradient magnetic field coil 32 with an outer shield winding 34 is equipped to add to a conventional MRI system configuration. The self shielded additional gradient magnetic field coil 32 is selectively and controllably driven by a low price drive circuit 36. That is, a sequence controller 26 can actuate the additional gradient magnetic field coil 32 to generate an additional gradient magnetic field pulse with a size and a continuing time of the current drive selected at any programmable time within a predetermined MRI sequence. For instance, when coil insertion is used for slice selection in a case ununiformity is not so conspicuous, generation of a gradient magnetic field with intensity as high as about five times can be achieved in an extremely short time.

3. 发明专利

JPH04312446A REAL-TIME MR IMAGED SYSTEM LOCATED AT INTERIOR OF GANTRY CHAMBER AND METHOD THEREFOR 失效
公开(公告)号：JPH04312446A
公开(公告)日：1992-11-04
申请号：JP1710792
申请日：1992-01-31
申请人： UNIV CALIFORNIA
发明人： REON KAUFUMAN , DEIBITSUDO EMU KURAMAA , BARII MATSUKAATEN , MITSUAKI ARAKAWA , KURISUTEIIN HOURIZUKO
IPC分类号： A61B5/055 , G01R33/28 , G01R33/38
摘要： PURPOSE: To allow the positioning of an operator and (or) a patient in a gantry chamber sealed integrally together with an MRI magnet, a console for observation and other components of an MRI system by using a continuously updated real time magnetic resonance imaging processing when an MR imaging area is displayed. CONSTITUTION: An MRI magnet assembly and a console for observation positioned near this assembly are both arranged in a sealed gantry chamber. A CRT display is used in a feeble magnetic field MRI system and a liquid crystal display in a ferromagnetic field MRI system. A stable RF shield is provided for RF separation of the console for observation, a power source and a video signal cable related thereto to monitor a relatively weak NMR signal which is released from an imaging area in the magnet assembly. A real time observation of an imaging area in the gantry chamber is performed simultaneously with the treatment of patients.

4. 发明专利

JPH06261876A SIDE FITTING OF PATIENT IN C-SHAPED MAGNET OF MRI WHICH CAN APPROACH AND GET ACCESS TO PATIENT OPENLY 失效
公开(公告)号：JPH06261876A
公开(公告)日：1994-09-20
申请号：JP23629693
申请日：1993-09-22
申请人： UNIV CALIFORNIA
发明人： ANDORIYUU JIEI RII , REON KAUFUMAN
IPC分类号： A61B5/055 , G01R33/28 , G01R33/38 , G01R33/421
摘要： PURPOSE: To improve accessibility of an MRI system structure using an opener C-type magnet, and minimize the volume necessary for an attendant RF shielded gantry room. CONSTITUTION: A special patient transferring mechanism 50 has structures 55a to 55d which expand and contract at least partly around a lower magnetic polar surface 14 of the C-shape MRI polarized magnet 10 when a patient 58 is laterally loaded to an imaging volume between magnetic polar surfaces. Open accessibility in the substantially close vicinity of the patient 58 is maintained by a loading procedure, a subsequent preparation procedure and an imaging procedure which accompany the MRI system.

5. 发明专利

JPH05184554A METHOD AND DEVICE FOR ACHIEVING INTERVENING MEDICAL PROCEDURE USING MAGNETIC RESONANCE IMAGING OF INTERVENING DEVICE SUPERPOSED ON GHOST PATENT IMAGE 失效
公开(公告)号：JPH05184554A
公开(公告)日：1993-07-27
申请号：JP16285192
申请日：1992-06-22
申请人： UNIV CALIFORNIA
发明人： REON KAUFUMAN , DEIBITSUDO EMU KURAMAA , KURISUTEIIN HOURIZUKO
IPC分类号： A61B5/055 , A61B17/00 , A61B19/00 , G01R33/28 , G01R33/48
摘要： PURPOSE: To simulatively position an intervention device such as needle within or on the image ghost of a patient in real time, by superposing the MR image of the anatomic tissue of the patient gained in the past and the real time MR image of the intervention device on each other. CONSTITUTION: The anatomic tissue 14 of a patient is placed within the image volume of an MRI system magnet 16, and one set of ghost images 12a, 12b, 12c are stored. Then, the tissue 14 is removed from the image volume on a bed 18, a needle 20 is guide into the image volume of the MRI system 10, and its locus course is guided by a guide passage 22 through a universal joint 24, a slider joint 25, and a stop 23. At that time, the optimum interventional device locus is planned by superposing the real time fluoroscopic MRI of the needle 20 and the images 12a, 12b, 12c on each other. When the needle 20 is once removed from the image volume, and the tissue 14 is placed within the image volume, the needle 20 is slid to a marker 26 along a desired locus.

6. 发明专利

JPH08206092A POLE TIP WITHOUT EDDY CURRENT FOR MRI MAGNET AND ITS MANUFACTURE 失效
公开(公告)号：JPH08206092A
公开(公告)日：1996-08-13
申请号：JP24319495
申请日：1995-09-21
申请人： UNIV CALIFORNIA
发明人： REON KAUFUMAN , JIYOOZEFU DABURIYU KAARUSON
IPC分类号： G01R33/38 , A61B5/055 , G01R33/383 , G01R33/385 , H01F7/02
摘要： PROBLEM TO BE SOLVED: To provide a magnetic pole tip of an inexpensive electrostatic magnet which enables production thereof from an spiral ferromagnetic material and moreover, removal of a possible eddy current. SOLUTION: A spiral coil 25 made of a ferromagnetic material is used with the diameter larger than the diameter D of a desired magnetic pole end part and magnetic pole ends 32A and 32B of an electrostatic magnet are cut out of a spiral slag made of a ferromagnetic material at a position on an eddy off the center 23 of the axis of the eddy to produce a magnetic pole end of an electrostatic magnet. The magnetic pole end is made up of a plurality of layers 27 of an arc-shaped ferromagnetic material electrically separated.

7. 发明专利

JPH07373A INTERVENTION-TYPE MRI SYSTEM AND RF COIL FOR THE SAME SYSTEM 失效
公开(公告)号：JPH07373A
公开(公告)日：1995-01-06
申请号：JP4259194
申请日：1994-03-14
申请人： UNIV CALIFORNIA
发明人： REON KAUFUMAN
IPC分类号： A61B5/055 , G01R33/32 , G01R33/34 , G01R33/36
摘要： PURPOSE: To easily insert an interventional appliance such as a sterotaxis frame and a part of a patient by constituting an RF receiving coil as a solenoid having a cap having a spiral coil interrupted by a gap, and freely opening this on one side. CONSTITUTION: A main polarized magnetic field Bo is formed between horizontally arranged magnetic poles 100 and 102, and a large iron yoke structure 104 is arranged for a return magnetic flux passage. Flat pancake-shaped inclined magnetic field coils 106 and 108 are arranged in the polarized magnetic field Bo to impart an inclined magnetic field along ordinary orthogonal coordinates X to Z. An RF receiving coil 122 being a solenoid having a cap having a spiral coil interrupted by a gap is also provided, and a stereotaxis frame 124 fixed to a head part of a patient 126 is housed in this. The RF receiving coil 122 is opened sideways in the gap, and can be easily inserted from the horizontal direction of a face lower part of the patient positioned on the opposite side of the stereotaxic frame 124.

8. 发明专利

JPH01146530A MAGNETIC RESONANCE IMAGING APPARATUS HAVING ACCESS PORTION OF OPENED TYPE TO PATIENT-IMAGING AREA 失效
公开(公告)号：JPH01146530A
公开(公告)日：1989-06-08
申请号：JP27105888
申请日：1988-10-28
申请人： UNIV CALIFORNIA
发明人： REON KAUFUMAN
IPC分类号： A61B10/00 , A61B5/055 , G01R33/20 , G01R33/28 , G01R33/38
摘要： PURPOSE: To suppress claustrophobic reaction of a patient by forming a static magnetic field magnet, a gradient coil and a decorative cover structure so that an opened and uninterrupted patient access region directly communicating with an imaging region remains. CONSTITUTION: Gradient coils 106 are held mutually as densely as possible to be fitted in an annular rose shim 104 and substantially parallel to the surfaces of permanent magnets 102 and a composite magnetic field forming structure is substantially composed of a 'flat' or 'pancake' type structure. A proper magnetic circuit is necessary for the return magnetic flux between the permanent magnets 102 and this return passage is determined so as to leave not only an opened access part patient feed ports 300, 302 but also laterally opened type access openings 400, 402 directly allowed to communicate with each other without being interrupted along the direction vertical to a patient feed axis (z) with respect to an imaging region 500. Therefore, when a patient advances within an imaging region, he receives an opened and substantially uninterrupted feeling and claustrophobic reaction is suppressed or minimized.

9. 发明专利

JPH06261878A MRI- RF COIL USING SOLENOID COIL OF ZERO PITCH 失效
公开(公告)号：JPH06261878A
公开(公告)日：1994-09-20
申请号：JP21617793
申请日：1993-08-31
申请人： UNIV CALIFORNIA
发明人： KEBIN EE DAABII , REON KAUFUMAN
IPC分类号： A61B5/055 , G01R33/34 , G01R33/36 , G01R33/30
摘要： PURPOSE: To obtain an image inside the head easily by arranging one pair of solenoid coils of zero pitch for the orthogonal phase detection in a helmet surrounding the head part of a patient in order to couple an MRI-RF signal. CONSTITUTION: Crossing phase detection is carried out by means of MRI by accommodating a head part 102 of a patient. A condition of the head 102 is checked from a gap 202 of a transparent window 200. There is arranged one pair of solenoid wires L10, L20 with zero pitch. Turned parts of respective wires connect dog legs. The turn parts are connected in series along a surface of a solenoid within an area extending in a preset axial direction. Returning coils minimize an area of equal returning loops, thus coupling by means of the returning loops are minimized. Furthermore, loops for crossing phase detection are directed mainly for coupling to a magnetic field orthogonally crossing a main magnetic field. Thereby, an MRI image within the head of the patient can be obtained correctly.

10. 发明专利

JPH0638943A MAGNETIC RESONANCE IMAGING SYSTEM AND METHOD 失效
公开(公告)号：JPH0638943A
公开(公告)日：1994-02-15
申请号：JP29436292
申请日：1992-11-02
申请人： UNIV CALIFORNIA
发明人： REON KAUFUMAN , JIYOSEFU DABURIYU KAARUSON , RICHIYAADO GURAN
IPC分类号： A61B5/055 , G01R33/12 , G01R33/381 , G01R33/385 , G01R33/389 , G01R33/38
摘要： PURPOSE: To enable accurate and effective control of a net actual gradient magnetic field magnetic flux generated by a coil by providing a real time closed loop feedback control circuit. CONSTITUTION: An MRI processing is controlled by a control computer 106. Various digital magnetic flux requiring signals for an electromagnetic gradient magnetic field coil 102 are given to a feedback processing computer 120 of a real time gradient magnetic field magnetic flux sensor by a control computer 116 on a bus 118. The actual net detected magnetic flux for magnetic fields GX, GY SBO and GZ are input into the real time magnetic flux sensor feedback processing computer 120, and these are compared with appropriate flux requiring signals given by the control computer 106 respectively, and a necessary error control output 124 is generated in an electric current driver 104. Thereby, four independent closed loop real time feedback control systems are effectively completed.

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