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Inventor:
Yamamoto; Etsuji
Address:
Akishima, JP
No. of patents:
48
Patents:












Patent Number Title Of Patent Date Issued
6557558 Medical treatment apparatus May 6, 2003
A medical treatment apparatus capable of performing exact medical treatment is provided. The medical treatment apparatus includes detection means for detecting the condition of a human body to be treated, medical treatment means for treating said human body, and display means for display
5808467 RF probe and inspection system using NMR using the same September 15, 1998
In the inspection system using nuclear magnetic resonance comprising magnetic field generators such as a static magnetic field, a gradient magnetic field, and an RF magnetic field, an RF probe for detecting an NMR signal from a subject, and a calculator for operating a detected signal by
5789922 Inspecting method and apparatus based on nuclear magnetic resonance using burst wave as exciting August 4, 1998
In an inspecting method based on nuclear magnetic resonance, a burst wave having a plurality of sub-pulses frequency-modulated with a high frequency is generated, the burst wave is amplitude-modulated with at least a function which repeats polarity inversion, the amplitude-modulated burs
5754047 Inspection method and apparatus using nuclear magnetic resonance May 19, 1998
An inspection method by means of an inspection apparatus using nuclear magnetic resonance and having magnetic field generating apparatus for generating a static magnetic field, gradient magnetic fields and an RF magnetic field; magnetic field generating apparatus by means of additional
5684398 Fluid measurement method using nuclear magnetic resonance imaging and apparatus therefor November 4, 1997
A bolus of magnetized blood is formed by at least two radio frequency magnetic fields, and readout gradient magnetic fields are repeatedly applied at a proportion of 1:-2:1 along a blood vessel so as to continuously obtain a first echo signal whose phase change due to velocity is cor
5602480 Inspection method and apparatus using nuclear magnetic resonance February 11, 1997
An inspection method by means of an inspection apparatus using nuclear magnetic resonance and having magnetic field generating apparatus for generating a static magnetic field, gradient magnetic fields and an RF magnetic field; magnetic field generating apparatus by means of additional
5600245 Inspection apparatus using magnetic resonance February 4, 1997
An inspection apparatus using magnetic resonance includes magnetic field generators for generating a static magnetic field, a gradient magnetic field and a radio frequency magnetic field, respectively, a signal detector for detecting magnetic resonance signals from an inspected objec
5592088 Multiple-coil adopting a quadrature detection method applied thereto and a signal processing cir January 7, 1997
A probe for an MRI apparatus in a vertical magnetic field system including: an array coil which is formed by arranging a plurality of unit coils, which can be driven independently of one another, in a direction perpendicularly intersecting a direction of a static magnetic field; and a
5572124 Inspection method and inspection apparatus using nuclear magnetic resonance November 5, 1996
In an inspection method which generates a static magnetic field, a gradient magnetic field and a radio frequency magnetic field, detects nuclear magnetic resonance signals from an inspection object, computes and processes the nuclear magnetic resonance signals so detected and outputs
5559434 Magnetic resonance imaging apparatus and RF coil employed therein September 24, 1996
An MRI RF coil including first and second ring elements having a plurality of peripheral segments connected in ring shape which are apart from each other along a common vertical axial line. The RF coil also includes a plurality of axial conductive segments for connecting the first and se
5539311 Method for reducing artifacts in magnetic resonance imaging July 23, 1996
In magnetic resonance imaging, a first echo train is obtained by applying a readout gradient magnetic field to a region of interest to be imaged and periodically inverting the polarity of the readout gradient magnetic field, without applying an encoding gradient magnetic field to the reg
5528145 High-speed magnetic resonance imaging method June 18, 1996
A high-speed magnetic resonance spectroscopic imaging method for obtaining information relating to an object placed in a space by irradiating the object placed in the space applied with a static magnetic field and field gradients in three different directions so as to excite a nuclear sp
5510714 Magnetic resonance imaging apparatus and RF coil employed therein April 23, 1996
In a bird cage resonator, the axial length of rungs is changed between orthogonal elements. By doing this, the real view fields of orthogonal ports A and B in the sagittal direction are changed and the sensitivity difference between both view fields is reduced. For an object with an
5502384 Image reconstruction method in nuclear magnetic resonance imaging apparatus March 26, 1996
In an image reconstruction method in a nuclear magnetic resonance imaging apparatus, the method comprises first and second steps to get detected data S.sub.I for at least about half of region inclusive of an origin and data S.sub.IV in a region symmetric with respect to a line passing th
5489847 RF probe for MRI February 6, 1996
An RF probe for MRI, in which a plurality of unit coils including conductive loops having resonance capacitors and inductors connected with the conductive loops in series are arranged so as to be distant from each other with a predetermined distance, electromagnetic coupling being pr
5477145 RF probe December 19, 1995
In an RF probe comprising a resonator and a pickup coil, the pickup coil is an 8-shaped coil, and a center portion of this pickup coil is constituted in such a manner that crossing coils become parallel to each other at the portion. The center portion where the coils of the pickup coil a
5465719 Nuclear magentic resonance imaging apparatus November 14, 1995
A bobbin for holding a gradient magnetic field coil, having a changeable size and sectional shape (a separable bobbin) is constituted by assembling coil supporters (a bobbin divided into a plurality of segments). The separable bobbin has coil supporters of an upper part a bottom part and
5457386 Multiple-coil adopting a quadrature detection method applied thereto and a signal processing cir October 10, 1995
A probe for an MRI apparatus in a vertical magnetic field system including: an array coil which is formed by arranging a plurality of unit coils, which can be driven independently of one another, in a direction perpendicularly intersecting a direction of a static magnetic field; and a
5453692 RF probe for nuclear magnetic resonance imaging (MRI) devices September 26, 1995
An RF probe for an MRI device including a plurality of hollow cylindrical resonators arranged in series such that the respective axes of the resonators align substantially in a z-axis direction of a three dimensional orthogonal coordinate system, radio frequency power signal supply/r
5427102 Active noise cancellation apparatus in MRI apparatus June 27, 1995
An active noise cancellation apparatus of an MRI apparatus, including a detector for detecting vibration of a bobbin or a driving signal of a magnetism generator as a noise source signal, error signal detectors for detecting actual noise near the ears of a patient, a circuit for gene
5394872 Method of magnetic resonance imaging March 7, 1995
In a magnetic resonance imagining method, using an effect that a fluid flows out of a plane where it is selectively excited between the time of applying a 90.degree. radio frequency pulse and the time of applying of a 180.degree. radio frequency pulse, two, images are separately construc
5384536 Nuclear magnetic resonanace inspection apparatus and its method January 24, 1995
This application describes a nuclear magnetic resonance inspection apparatus. In this apparatus, a nuclear magnetic resonance signal detected by a detection coil is wirelessly transmitted to a signal processing system. In another embodiment, the nuclear magnetic resonance signal is s
5382902 Method for eliminating motional artifacts in magnetic resonance imaging January 17, 1995
A magnetic resonance imaging method for obtaining an image of an object laid in a space in which a static magnetic field is applied, so as to substantially eliminate motional artifacts. The method includes sequentially measuring a plurality of magnetic resonance views with a pluralit
5371465 Inspection method and apparatus using nuclear magnetic resonance (NMR) December 6, 1994
In an inspection apparatus using nuclear magnetic resonance (NMR), a spatial distribution of homogeneity of a static magnetic field can be quickly measured even when a heterogeneous object is inspected, by measuring simultaneously phase data and a transverse relaxation time at the sa
5280246 Nuclear magnetic resonance apparatus January 18, 1994
A nuclear magnetic resonance apparatus receives nuclear magnetic resonance signals from an object under test with an RF probe which is an array of coils, implements down-frequency conversion with frequency converters for the received signals in multiple channels such that the frequency b
5221898 Flow imaging method using an MRI apparatus June 22, 1993
This invention relates to a ultra-high speed nuclear magnetic resonance fluid imaging method for selectively reconstructing projected images of a fluid from an echo train generated by the use of a readout gradient magnetic field which inverses periodically. A pulse-like encoding gradient
5204626 Method for nuclear magnetic resonance measurements on low concentration solutes in solvent April 20, 1993
NMR signals of low concentration solutes are obtained with suppression of NMR signal of solvent by sequentially applying a first RF pulse sequence, a 180.degree. RF pulse and a second RF pulse sequence to an object. Each of the first and second RF pulse sequence includes equally spaced R
5195524 Flow imaging method by means of an MRI apparatus and apparatus for realizing same March 23, 1993
An MRI flow imaging method and apparatus wherein a width of a relevant region in a direction is set, in which fluid in a subject body flows, and a first 90.degree. radio frequency pulse is applied thereto to excite selectively a relevant region; a gradient magnetic field is applied t
5162737 Multi-echo NMR imaging method November 10, 1992
A multi-echo NMR imaging method of obtaining images separated from each other with respect to two kinds of chemical shifts, typically, a fat image and a water image, includes performing the measurement of an object to be examined through a multi-echo sequence in which phase differences o
5109198 Nuclear magnetic resonance imaging apparatus April 28, 1992
In a nuclear magnetic resonance imaging apparatus including a first probe circuit for detecting magnetic flux in a first direction and a second probe circuit for detecting magnetic flux in a direction perpendicular to the first direction, the arm angle of conductor arms to form the first
5107216 Nuclear magnetic resonance imaging apparatus April 21, 1992
In an imaging apparatus using the nuclear magnetic resonance, a solenoid coil and a slot-resonator coil are combined with each other so as to constitute a quadrature-phase detection probe. In order to operate the slot-resonator coil at low frequency, inductance is added to the slot-r
5065097 Testing method and apparatus by use of NMR November 12, 1991
A testing method and apparatus by use of nuclear magnetic resonance measure, at timings influenced and not influenced from chemical shift, nuclear magnetic resonance signals taken from a sample to be tested at least one of whose values of permeability and chemical shift is known and
5045791 Nuclear magnetic resonance imaging method September 3, 1991
A three-dimensional NMR imaging method using phase encoding field gradients along two direction is disclosed. The measurement of an NMR signal is repeated in such a manner that among all combinations of a plurality of magnitudes of gradient prepared for the phase encoding field gradient
5032793 NMR gated imaging apparatus July 16, 1991
Disclosed is an NMR gated imaging apparatus in which an ultrasonic pulse signal is repeatedly transmitted toward the heart of a human body from an ultrasonic transducer to detect the position of the heart on the basis of the time of detection of a peak of an echo signal, and excitation a
4959613 NMR imaging apparatus September 25, 1990
A field gradient generator in an NMR imaging apparatus comprises three sets of field gradient generating coils for respectively generating field gradients in three orthogonal directions in a space to be observed. Each set of coils includes a plurality of unit coils through which individu
4929881 Probe for nuclear magnetic resonance apparatus May 29, 1990
There is provided a probe to detect a nuclear magnetic resonance signal in which each of a plurality of arms forming a current path of an Alderman-Grant type coil is divided into two conductor plates, the two conductor plates are connected by an inductor, and a resonance frequency is
4875013 High-frequency coil for nuclear magnetic imaging October 17, 1989
A high-frequency coil of the type of slot resonator in which outer conductors that have wing portions at both ends thereof and that are divided, are formed on the cylindrical surface, and ring-like inner conductors are formed on the inside of the wing portions. The wing portions have
4875010 Circuit for detecting AC magnetic field due to magnetic resonance with a variable resistance for October 17, 1989
In a signal detecting circuit of, for example, an NMR apparatus, a signal transmission path transmits an AC magnetic flux signal to be superposed on a DC magnetic field whose strength does not change with time during a period of signal detection. The signal transmission path comprises a
4853636 NMR imaging method August 1, 1989
An NMR imaging method for obtaining a tomographic image of an object through two-dimensional Fourier transformation imaging. After a whole image of a predetermined slice is displayed, a given field of view having a given size and located at a given position in the image is designated.
4833408 NMR chemical shift imaging method with influence of intensity distribution of static magnetic fi May 23, 1989
In an NMR imaging method of distinguishing two chemical shifts of unclear spins and obtaining respective spin distribution images, 180.degree. RF. pulses are applied twice to generate two spin echoes after spins of an object for inspection have been exicted. In the second echo among them
4825163 Quadrature probe for nuclear magnetic resonance April 25, 1989
A quadrature probe for nuclear magnetic resonance includes two sets of coils which are combined with an angle of 90.degree. therebetween. Four pieces of outer conductors and two pieces of ring-shaped inner conductors are capacitively coupled to each other through an insulator or an air g
4791369 Method of measuring magnetic field error of an NMR imaging apparatus and of correcting distortio December 13, 1988
A method of finding error distribution in the static magnetic field and distribution of deviations from straight lines in the gradient magnetic fields of an NMR imaging apparatus which employs the applied spin-warp method. A phantom whose shape has been known is measured in the read-out
4777443 Inspection apparatus based on nuclear magnetic resonance October 11, 1988
Disclosed in a nuclear magnetic resonance (NMR) based inspection apparatus using an SQUID flux meter for detecting a small NMR signal, in which a receiving coil for receiving the NMR signal from an object is connected to a mixer, which mixes a reference high-frequency signal with the NMR
4760339 NMR imaging method July 26, 1988
An NMR imaging method is disclosed in which an object is measured in accordance with a pulse sequence capable of expressing a difference between two of a plurality of chemical shifts by a phase difference in a signal, that is, a pulse sequence 90.degree.-.tau..sub.a -180.degree.-.tau
4748412 High-frequency coil for nuclear magnetic resonator May 31, 1988
An Alderman high-frequency coil used for generating or detecting a high-frequency magnetic field in an NMR apparatus comprises two ring-shaped inner conductors aligned coaxially with a spacing being made therebetween and two outer conductors disposed to surround the inner conductors.
4740749 NMR imaging method April 26, 1988
In an imaging method called spin warp method in which a measuring sequence inclusive of nuclear spin excitation, application of phase-encoding gradient field, and measurement of NMR signals under the application of read-out gradient field, is repeated while changing the phase-encoding
4739265 NMR imaging method April 19, 1988
A method for providing spin density distribution images of an object, discriminated with respect to plural chemical shifts. This method is performed by repeating a measurement sequence in a spin warp imaging method, of the spin data plural times, with a time difference .DELTA..tau. b
4701709 NMR imaging method October 20, 1987
An NMR imaging method for measuring a magnetization distribution of an article under test, particularly the magnetization distribution including a longitudinal relaxation effect, by a Fourier imaging method with identification of polarity of the magnetization distribution.A homogeneous p










 
 
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