专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH07313487A INSPECTING METHOD AND INSPECTING SYSTEM USING NUCLEAR MAGNETIC RESONANCE 失效
公开(公告)号：JPH07313487A
公开(公告)日：1995-12-05
申请号：JP10998194
申请日：1994-05-24
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： BITO YOSHITAKA , HIRATA TOMOTSUGU , NABESHIMA TAKAYUKI , YAMAMOTO ETSUJI
IPC分类号： G01R33/48 , A61B5/055 , G01N33/48
摘要： PURPOSE:To measure the shapes of fine structures so as to limit molecular diffusion by repeating measurement while radially changing the impressing directions of diffused gradient magnetic fields and calculating the spacings between the limitation walls of diffusion with respect to all the directions. CONSTITUTION:The high-frequency magnetic fields for exciting the unclear spins of an object 2 to be inspected are generated by subjecting the high- frequencies generated by a synthesizer 10 to waveform shaping and power amplifying and supplying currents to a coil 3. Gradient magnetic field generating coils 4, 5, 6 supplied with the currents from a coil driving device 7 generate the gradient magnetic fields, which modulate the magnetic resonance signals from the object 2 to be inspected. The modulated signals are received by the coil 3, are amplified by an amplifier 12 and are detected by a detector 13; thereafter, the signals are inputted to a calculator 8. The results of the calculation are displayed on a CRT display 9. The impression directions of the gradient magnetic fields are radially changed and the spacings of the fine structures in the impression directions are measured from the average moving distances of the molecules in the respective impression directions.

2. 发明专利

JPH0788103A MAGNETIC RESONANCE IMAGING METHOD 失效
公开(公告)号：JPH0788103A
公开(公告)日：1995-04-04
申请号：JP17070494
申请日：1994-07-22
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： HIRATA TOMOTSUGU , BITO YOSHITAKA , YAMAMOTO ETSUJI
IPC分类号： G01R33/32 , A61B5/055 , G01R33/48
摘要： PURPOSE:To provide the magnetic resonance imaging method by which the spatial resolution and the spectral band can be set independently. CONSTITUTION:To a pre-stage of the sequence of a high speed MRSI method (magnetic resonance spectroscopic imaging method), a first to a third steps are added, and with regard to substance A, B whose chemical shifts are different from each other, an excitation of a nuclear spin and a measurement of a magnetic resonance signal are executed, and at the time of single echo train signal measurement, a spectral band is narrowed. In a first stage, a high frequency magnetic field of a center frequency (fa) (the frequency band is (fb-fa), and (fa) and (fb) denote resonance frequencies of A and B) and a slice selection gradient magnetic field Gz are applied simultaneously, and the unclear spin of A in a slice, and the unclear spin of B outside of the slice are excited. In a second stage, the high frequency magnetic field whose phase is inverted by 180 deg.C, and the Gz whose gradient polarity is inverted are applied simultaneously, the unclear spin in the slice is restored forcibly to its original thermal equilibrium state, and the unclear spin of B outside of the slice is set to an exciting state. In a third stage, spoil gradient magnetic fields Gz, Gx and Gy are applied simultaneously, and the unclear spin of B being in an exciting state is set to a pseudo-saturated state. In such a way, chemical shift information is obtained by a high speed high resolution.

3. 发明专利

JPH0698878A METHOD AND APPARATUS FOR MRI NUMERICAL SIMULATION 失效
公开(公告)号：JPH0698878A
公开(公告)日：1994-04-12
申请号：JP24296392
申请日：1992-09-11
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： NAKATANI CHITOSE , TANIGUCHI AKIRA , BITO YOSHITAKA , YAMAMOTO ETSUJI
IPC分类号： A61B5/055 , G01R33/46
摘要： PURPOSE:To provide MRI numeral simulation method and apparatus which are effective as tool to develop a more sophisticated MRI apparatus by clarifying a nuclear resonance phenomenon. CONSTITUTION:A pulse sequence is generated at the step 401, image information of a specimen at the step 402 and information on characteristics of the apparatus at the step 403. At the step 404, a transient matrix is formed based on those obtained at the steps 401, 402 and 403. At the steps 405 and 406, a numerical computation and a calculation of MR signals according to the pulse sequence. At the step 405, a numerical computation section is formed to solve a Bloch's equation for each pixel to perform a calculation for magnetization. At the step 407, a processing such as fast Fourier transform is performed for the MR signal obtained at the step 405 to reconstruct an tomographic image of the specimen. The results are displayed at the step 408. This enables the realization of fast and highly accurate high performance MRI numeral simulation.

4. 发明专利

JPH05245128A 失效
公开(公告)号：JPH05245128A
公开(公告)日：1993-09-24
申请号：JP4823392
申请日：1992-03-05
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： BITO YOSHITAKA , TANIGUCHI AKIRA , YAMAMOTO ETSUJI , NAKATANI CHITOSE , ONODERA YUKARI
IPC分类号： A61B5/055 , G01R33/28 , G01R33/32
摘要： PURPOSE:To reduce a body motion artifact by calculating data for showing a body motion from projection data, correcting the projection data, based on its data, and correcting the body motion. CONSTITUTION:Projection data (nu, theta) (-pi/2

5. 发明专利

JPH0947439A FLOW RATE IMAGING METHOD BY MRI DEVICE 失效
公开(公告)号：JPH0947439A
公开(公告)日：1997-02-18
申请号：JP20065995
申请日：1995-08-07
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： TAKEUCHI FUMIYA , TANIGUCHI AKIRA , BITO YOSHITAKA , YAMAMOTO ETSUJI , OKAJIMA KENICHI
IPC分类号： G01P5/20 , A61B5/055
摘要： PROBLEM TO BE SOLVED: To reduce artifact and measure flow rate accurately and in a short time, by constituting images of echo signals including and not-including phase modulation of magnetization due to flow, and by determining phase and arithmetically operating. SOLUTION: An echo signal which is generated by inverting polarity of amplitude of a lead-out gradient magnetic field is measured and complex images Ie 1, Ic 1 are obtained from an echo signal line Se 1 which includes phase modulation or magnetization due to flow and from the echo signal line Sc 1 which does not includes that. Secondly, the echo signal line which is generated by inverting polarity or amplitude of a lead-out gradient magnetic field is measured so as to invert the direction of phase modulation due to flow, and the complex images Ie 2, Ie 2 are obtained from both the echo signal line Se 2 which includes phase modulation of magnetization due to flow and from the echo signal line Sc 2 which does not includes that. Lastly, a complex differential image Id 1 between Ie 1 and Ic 1 and the complex differential image Id 2 between Ie 2 and Id 2 are obtained. The phase of the obtained complex differential images between Id 1 and Id 2 are further reduced with each other, and the phase differential image is determined. The phase differential image is converted into a flow rate image, thereby flow rate is obtained.

6. 发明专利

JPH07289534A MAGNETIC RESONANCE IMAGING METHOD 失效
公开(公告)号：JPH07289534A
公开(公告)日：1995-11-07
申请号：JP8616594
申请日：1994-04-25
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： HIRATA TOMOTSUGU , BITO YOSHITAKA , YAMAMOTO ETSUJI
IPC分类号： A61B5/055 , G01R33/48
摘要： PURPOSE:To erase a signal from an unrequired substance and to easily detect a signal from a small quantity of metabolite by using plural high-frequency pulses provided with different flip angles and gradient magnetic fields for spoil. CONSTITUTION:A second high-frequency pulse RF2 in which the flip angle of nuclear spin provided with magnetization to which erasure is insufficiently applied is adjusted so as to be 90 deg. (or odd number times of 90 deg.) is irradiated. Either of gradient magnetic fields Gx, Gy and Gz is applied as a second gradient magnetic field Gs2 for spoil immediately after irradiation, and the magnetization of the nuclear spin can be erased. When the magnetization for which the erasure is insufficiently performed even by applying the high-frequency pulse RF2 and the second gradient magnetic field Gs2. for spoil exists, third, fourth,... n-th high-frequency pulses and gradient magnetic fields for spoil are applied repeatedly until the erasure of the magnetization can be sufficiently performed. After the erasure of the magnetization is sufficiently performed, either of a magnetic resonance spectrum, a magnetic resonance spectrum image and a magnetic resonance image is measured.

7. 发明专利

JPH0767849A DIFFUSION COEFFICIENT MEASURING METHOD IN NUCLEAR MAGNETIC RESONANCE APPARATUS 失效
公开(公告)号：JPH0767849A
公开(公告)日：1995-03-14
申请号：JP21858393
申请日：1993-09-02
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： BITO YOSHITAKA , HIRATA TOMOTSUGU , YAMAMOTO ETSUJI
IPC分类号： A61B5/055 , G01R33/48
摘要： PURPOSE:To eliminate an error of a diffusion coefficient caused by ununiformity of a magnetic field, and to obtain an exact diffusion coefficient by calculating a gradient magnetic field factor from magnetic field ununiformity data and an impressed gradient magnetic field used for obtaining diffusion coefficient measured data, and calculating the diffusion coefficient by using the gradient magnetic field factor. CONSTITUTION:In the nuclear magnetic resonance apparatus provided with a magnet 1 for generating a static magnetic field, a coil 3 for generating a high frequency magnetic field and detecting a signal generated from an object body 2, and gradient magnetic field generating coils 4-6 for generating a gradient magnetic field in the X-Z directions, respectively, the influence of ununiformity of the magnetic field is eliminated by using a gradient magnetic field factor which becomes a function of a place for calculating a diffusion coefficient in accordance with ununiformity of the magnetic field, at the time of measuring the diffusion coefficient. That is, first of all, by considering both of the ununiformity of the magnetic field and the impressed gradient magnetic field at the time of measuring the diffusion coefficient, the gradient magnetic field factor is calculated. Subsequently, data is obtained by using the same diffusion measuring method as a conventional one, and from the obtained data, the diffusion coefficient is calculated by using the gradient magnetic field factor being the function of the place.

8. 发明专利

JPH0755905A SPECTRUM ANALYZING METHOD 失效
公开(公告)号：JPH0755905A
公开(公告)日：1995-03-03
申请号：JP19815593
申请日：1993-08-10
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： BITO YOSHITAKA , YAMAMOTO ETSUJI , TAKEDA RYUSABURO , WATARI HIROSHI
IPC分类号： A61B5/055 , G01N30/86 , G01R33/32
摘要： PURPOSE:To rapidly resolve a spectrum by resolving a single spectrum disposed at one end side of an observing area to a symmetrical waveform and the other waveform at a peak position of the single spectrum as a center. CONSTITUTION:An observation spectrum is obtained from a nuclear magnetic resonance apparatus, various analyzer such as an X-ray diffraction, etc., or an inspecting unit. Number and spectral peak position of a single spectrum (spectrum regarding a component included in a sample to be inspected) included in an observing spectrum are calculated based on observing spectral data. The single spectrum disposed at the spectral peak position is calculated from one end of the observing area of the spectrum, and resolved from an superposed spectrum (observing spectrum). The calculation of the single spectrum is conducted by resolving the single spectrum to a symmetrical waveform and an asymmetrical waveform at the peak value of the single spectrum as a center, and counting the symmetrical waveform as the single spectrum. This step is repeated times of number of the single spectra, and the resolving of the spectrum is completed.

9. 发明专利

JP2000093402A MAGNETIC RESONANCE IMAGING AND MAGNETIC RESONATOR 失效
公开(公告)号：JP2000093402A
公开(公告)日：2000-04-04
申请号：JP26647998
申请日：1998-09-21
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： BITO YOSHITAKA , HIRATA TOMOTSUGU , ONODERA YUKARI , SHIMIZU HIROMICHI , EBISU TOSHIHIKO , TAKEGAMI TETSUO , NARUSE SHOJI
IPC分类号： A61B5/055 , G01R33/32 , G01R33/48
摘要： PROBLEM TO BE SOLVED: To suppress the inclusion of a fat signal by determining the value of the time by inverse transformation of the data of a chemical shift region including the spectra of lactic acid to the data of a time region by using a measurement parameter including the one time within a data acquisition time and calculate the signal intensity of the lactic acid. SOLUTION: When the spin bonding constant of the lactic acid is defined as J, the echo time TE is so set as not to attain integer times 1/J and the measurement parameter is so set that the one time n/J (n is a natural number) is included in the data acquisition time (1). Spectroscopic imaging or the measurement of spectroscopy and data reconstitution are executed by using this measurement parameter (2). The data of the chemical shift region including the spectra of the lactic acid is subjected to Fourier transform and is inverse transformed to the data of the time region (3). The value at the time n/J of the inverse transformed data is determined and the signal intensity of the lactic acid is calculated (4).

10. 发明专利

JPH08257010A EXAMINATION DEVICE USING MAGNETIC RESONANCE 失效
公开(公告)号：JPH08257010A
公开(公告)日：1996-10-08
申请号：JP6554095
申请日：1995-03-24
申请人： HITACHI LTD , HITACHI MEDICAL CORP
发明人： YAMAMOTO ETSUJI , KATAKURA KAGEYOSHI , ONODERA YUKARI , BITO YOSHITAKA , OCHI HISAAKI , TANIGUCHI AKIRA , HIRATA TOMOTSUGU , TAKEUCHI FUMIYA , ITAGAKI HIROYUKI , NABESHIMA TAKAYUKI
IPC分类号： G01R33/54 , A61B5/055
摘要： PURPOSE: To provide a high contrast even in a site with low S/N ratio and retrieve many diagnostic information, by making a space resolution variable according to S/N distribution of an image. CONSTITUTION: A control device 1 is provided with a function for outputting various commands to each device at specific timing. An output from a high frequency pulse generator 2 is amplified by means of a high frequency power amplifier 3 to excit a coil 4. A signal receiving at the coil 4 is passed through a signal detecting system 5, A/D converted by means of an A/D converter 6 and thereafter is converted into an image by means of a signal processing device 7 and displayed on a display device 8. A human body 12 which is an objective of examination is placed on a bed 13 movable on a supporting stand 14. Here, a surface coil 4 is made to have high space resolution at the site 18-1 with high S/N ratio neighbouring on the coil 4, and have low space resolution at the site 18-2 with low S/N ratio distant from the coil.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式