Yokogawa Medical Systems, Limited

Ge Medical Systems Global Technology Company, LLC

Yokogawa Hokushin Electric Corp.

Ge Yokogawa Medical Systems, Limited

General Electric Company

Yokogawa Electric Corporation

Kazuya Hoshino

Hiroyuki Matsuura

Eiji Yoshitome

Yuji Inoue

Tadashi Sugiyama

Noriaki Yamada

Kenji Sato

Takao Goto

Hideto Iwaoka

Keiki Yamaguchi

Susumu Kosugi

Phillip William Eckels

Masaaki Sakuma

Bruce David Collick

Yukitoshi Shimo

Kazuhiko Hayakawa

Wanxian Wang

For the purpose of acquiring magnetic resonance signals unaffected by any high magnetic field disturbance, magnetic resonance signals are sequentially acquired for a plurality of views; magnetic field disturbance is monitored; the magnetic resonance signal acquisition is repeated for a view at which magnetic field disturbance has occurred; and an image is produced based on magnetic resonance signals after the repetition has been applied.

Magnetic resonance signal acquiring apparatus and magnetic resonance imaging apparatus

The temperature of permanent magnet blocks embedded in several positions in permanent magnets and base yokes will be adjusted by device of a heater to improve the static field uniformity.

Static field controlling method and MRI apparatus

For the purpose of RF pulse tuning so as to effectively utilize the capacity of an RF transmission apparatus, in tuning the RF pulse for excitation use so as to make the flip angle of spins identical with its target value, the pulse width of the RF pulse is consecutively increased from its predetermined initial value until the flip angle of spins become identical with its target value ( through ). Further, if the flip angle fails to reach its target value even though the amplitude of the RF pulse is raised to the adjustable maximum, the next increment of the pulse width is determined according to the extent of failure to attain the target.

Systems and methods for tuning an RF pulse by changing a pulse width of the RF pulse

With a view toward implementing an RF coil easy to uniformize the strength of a magnetic field, the RF coil is provided with a first current path group of wires including a plurality of linear current passes placed in parallel with one another, a second current pass group of wires placed so as to have the relations in mirror image with respect to the first current pass group, and a third current pass group of wires in which all the linear electrical passes are series-connected so as to be identical in current direction through both groups of the first and second current pass groups while bypassing the first and second current pass groups.

RF coil and magnetic resonance imaging system

In order to generate an RF magnetic field efficiently, an RF coil is used comprising electric paths,carrying electric current for generating the RF magnetic field within a space containing a subject, and an annular electric path,located farther from the subject than the electric paths,from the subject, for linking respective ends of the electric paths

RF coil, RF magnetic field generating apparatus and magnetic resonance imaging method and apparatus

An open architecture magnetic resonance imaging permanent magnet assembly with moveable magnets and adjustable field inclination with automatic magnetic field homogeneity shimming to enhance imaging and positioning of the magnetic field about the portion of the patient to be imaged while enabling interventional physician access.

Adjustable interventional magnetic resonance imaging magnet

RF drive circuit of MR apparatus

Image distortion correcting method applied to an NMR imaging apparatus

Magnetic resonance imaging method

Selective excitation method for nmr imaging

NMR imaging method and apparatus

A method of simultaneously correcting distortion in density due to uneven sensitivity of receiving coils, and location dependent phase distortion inherent in the system, wherein a phantom is scanned to determine echo signals, which echo signals are subjected to 2-dimensional inverse Fourier transformation, to obtain an image (Cij) and stored as it is in the form of a complex number, then the object to be examined is measured by similar operation to obtain an image (Oij) and wherein the image (Oij) is divided by computation with image (Cij) as follows .vertline.Sij.vertline.=.vertline.Oij.vertline./.vertline.Cij.vertline., by which equation computation is made to correct for density distortion, and wherein the angle of deviation is set as follows arg [Sij]=arg[Oij]-arg[Cij].ident.0, by which equation computation is made to correct for phase distortion. An image of the object is thus obtained which is corrected for density distortion and for phase distortion, by taking the real number part of the image Sij which is the determined image of the object.

Method of correcting the phase and shading in a nuclear magnetic

Method and apparatus for nuclear magnetic resonance imaging

An object which can provide a reference for measuring the intensity of a primary magnetic field, is positioned in the vicinity of a subject being examined. A variation in the primary magnetic field intensity is detected, based on a frequency shift of data observed of the object, and is used to control the primary magnetic field intensity, or reference frequency for phase detection, or to correct image data. In this manner image quality is prevented from being degraded due to the variation of the primary magnetic field intensity.

NMR apparatus compensated for primary field changes

Growing community of inventors

Tokyo, Japan

Kazuya Hoshino