Abstract: A magnetic field adjusting method according to an embodiment includes: acquiring, by using a measuring device, first data related to a static magnetic field while a static magnetic field magnet is generating the static magnetic field having magnetic field intensity lower than rated magnetic field intensity required by an imaging process performed by a magnetic resonance imaging apparatus; and calculating, by using processing circuitry, a positional arrangement of a shim member used for correcting uniformity of the static magnetic field on the basis of the first data.

Abstract: A feedforward control unit predicts the maximum value of the temperature of a gradient coil based on a power duty and a scan time of a pulse sequence, and a present temperature of the gradient coil. When the maximum value exceeds a predetermined upper limit, the feedforward control unit then instructs a temperature adjusting unit to start a water circulation in a chiller at the start of a prescan, and the temperature adjusting unit starts the water circulation based on the instruction.

Abstract: A feedforward control unit predicts the maximum value of the temperature of a gradient coil based on a power duty and a scan time of a pulse sequence, and a present temperature of the gradient coil. When the maximum value exceeds a predetermined upper limit, the feedforward control unit then instructs a temperature adjusting unit to start a water circulation in a chiller at the start of a prescan, and the temperature adjusting unit starts the water circulation based on the instruction.

Abstract: A feedforward control unit predicts the maximum value of the temperature of a gradient coil based on a power duty and a scan time of a pulse sequence, and a present temperature of the gradient coil. When the maximum value exceeds a predetermined upper limit, the feedforward control unit then instructs a temperature adjusting unit to start a water circulation in a chiller at the start of a prescan, and the temperature adjusting unit starts the water circulation based on the instruction.

Abstract: An MRI apparatus in which a magnetic field is applied to a subject, a receiver coil attached to the subject receives a magnetic resonance signal generated in the subject, and a magnetic resonance image of the subject is generated from the magnetic resonance signal, the apparatus comprising a gantry which comprises a magnetic-field generating unit for generating the magnetic field, a determining unit which determines the type of the receiver coil, a first memory unit which stores data items representing a plurality of methods of attaching various receiver coils, each method designated for one receiver coil, and a monitor which is provided on the gantry and which displays one of the methods stored in the first memory unit, which pertains to the receiver coil whose type has been determined by the determining unit.

Abstract: An MRI apparatus in which a magnetic field is applied to a subject, a receiver coil attached to the subject receives a magnetic resonance signal generated in the subject, and a magnetic resonance image of the subject is generated from the magnetic resonance signal, the apparatus comprising a gantry which comprises a magnetic-field generating unit for generating the magnetic field, a determining unit which determines the type of the receiver coil, a first memory unit which stores data items representing a plurality of methods of attaching various receiver coils, each method designated for one receiver coil, and a monitor which is provided on the gantry and which displays one of the methods stored in the first memory unit, which pertains to the receiver coil whose type has been determined by the determining unit.

Abstract: A magnetic resonance imaging apparatus includes a storage unit configured to store positional information about positional relationships between a first ROI and a reference image, and a ROI setting unit configured to set a second ROI to determine a position of a tomographic image based on the positional information.

Abstract: A magnetic resonance imaging apparatus includes a storage unit configured to store positional information about positional relationships between a first ROI and a reference image, and a ROI setting unit configured to set a second ROI to determine a position of a tomographic image based on the positional information.

Abstract: There are disclosed An antioxidant composition for organic material, which comprises, as effective ingredients, a) a hindered phenol compound of formula (I): b) at least one metal compound, wherein the metal is selected from the group consisting of Groups I, II and IV of the Periodic Table of Element according to IUPAC Recommendations 1985, and wherein the weight ratio of the ingredient b) in terms of the metal to the total amount of ingredients a) and b) is 1 ppm or more, and an organic material composition containing the antioxidant composition.

Abstract: Time-Of-Flight (TOF) MRI techniques are used to enhance blood flows into one of a pair of images for a given plane or slice of a patent's body. Arithmetic subtraction of such images produces a resultant image of substantially only blood flows since images of fat or other tissue are thus nulled out of the resultant image. All basic MRI sequences (e.g., FE, SE, etc.) can be used in conjunction with a pre-pulse on additional sub-sequences in a plane displaced from the objective plane to be imaged. Both arterial and venous blood flows can be imaged (separately or together in one resultant image). Color coding can be used in the resultant images to distinguish blood flow directions and/or velocities.

Abstract: A system for magnetic resonance imaging is provided in which a prepulse is first applied to an object being examined placed in a static magnetic field for suppressing an MR signal from fat of the object. Then a pulse sequence including an RF pulse for multi-slice imaging of a plurality of slicing planes is applied to the object for acquiring image data. The system comprises an element for performing a shimming increasing uniformity of the static magnetic field, an element for detecting, every one of the slicing planes, an offset value offsetting a frequency shift of a spectrum distribution caused by turbulence in higher-order components of the static magnetic field, and an element for correcting, every one of the slicing planes, a frequency range of the prepulse in accordance with the offset value detected. The correcting element corrects a frequency of the RF pulse in compliance with the detected offset value.

Abstract: A magnetic resonance imaging method and system utilizing a magnetization transfer contrast pulse that includes executing a first sequence including the application of the magnetization transfer contrast pulse to an examinee and executing a second sequence for acquiring a magnetic resonance angiography image data related to a predetermined imaging plane. The first sequence further includes the step of applying a slice gradient magnetic field for spatially selectively exciting a predetermined magnetization transfer contrast excitation plane at substantially the same timing as that of the magnetization transfer contrast pulse. A predetermined gradient magnetic field is applied by a gradient magnetic field application means in a manner superimposing upon a predetermined static magnetic field. An RF transmitting/receiving means is arranged for transmitting an RF pulse to an examinee and receiving a magnetic resonance signal from the examinee.

Abstract: A method of magnetic resonance imaging comprises, as one aspect, the steps of performing a first sequence including a step for applying a binomial pulse and performing a second sequence for collecting magnetic resonance (MR) image data. The binomial pulse application step, the central frequency of the binomial pulse is offset by a predetermined offset amount toward the high frequency side with respect to the resonance frequency of protons contained in water and the binomial pulse is applied.

Abstract: 2-Methyl-3-(2,2,6,6-tetramethyl-4-piperidylamino)-N-(2,2,6,6-tetramethyl-4- piperidyl)-propionamide represented by the following formula, a process for producing the same and a stabilized organic material composition containing the same wherein the piperidine compound imparts excellent properties, such as light stability or thermal stability to the organic materials.

Abstract: A polyolefin composition comprising a polyolefin, and the following components:(A) a phenolic compound such as 1,3,5-tris(3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate;(B) an acrylate compound represented by the formula (I): ##STR1## wherein R.sup.1 is an alkyl of 1 to 5 carbon atoms, R.sup.2 is an alkyl of 1 to 8 carbon atoms, R.sup.3 is hydrogen or an alkyl of 1 to 8 carbon atoms, and R.sup.4 is hydrogen or methyl;(C) an organic phosphorous compound such as bis(2,6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite; and(D) a hindered piperidine compound such as poly[{6-(1,1,3,3-tetramethylbutyl)imino-1,3,5-triazin-2,4-diyl}{(2,2,6,6-t etramethyl-4-piperidyl)imino}hexamethylene{(2,2,6,6-tetramethyl-4-piperidyl )imino}]. This composition is stable against thermal processing, thermal oxidation, light oxidation and discoloration, and it is especially useful for fibers and films.

Abstract: A gradient field is applied in a coronal scheme such that a slice region along the flowing direction of a blood vessel, i.e., along the body axis is set as an imaging area. Of regions adjacent to the imaging region in the body axis direction, a region including a blood vessel as a target of imaging (in this case, an artery) through which the blood flows toward the imaging region is not excited, but only the imaging region is selectively excited. Then, since a spin in the artery is supplied to the imaging region in a fresh state, the image of this spin is formed with a signal level higher than that of a stationary spin remaining in the imaging region. Since the presaturated blood in the artery in the imaging region is returned at its peripheral portion to flow through the vein, the spin in the vein is already saturated, its signal level is lower than that of the spin in the artery, and the image of this spin is not formed.

Abstract: A polyolefin resin (A) containing carbon black is blended with the following components:(B) a phenolic compound represented by the following formula (I): ##STR1## wherein R.sup.1 is alkyl of 1 to 4 carbon atoms; (C) an organic sulfur compound selected from the compounds represented by the following formulas (II-1) and (II-2):(R.sup.2 --OCOCH.sub.2 CH.sub.2).sub.2 S (II-1)(R.sup.2 --SCH.sub.2 CHCOOCH.sub.2).sub.4 C (II-2)wherein R.sup.2 is alkyl of 4 to 20 carbon atoms;(D) a piperidine compound having at least one 2,2,6,6-tetramethylpiperidine ring in a molecule; and(E) an epoxy compound of bisphenol A type glycidyl ether. The composition thus blended exhibits excellent stability against thermal oxidation.

Abstract: A polyolefin composition comprising a polyolefin, and the following components:(A) a phenolic compound which is a derivative of pentaerythritol,(B) a phenolic acrylate compound,(C) at least one organic phosphorous compound such as bis(2,6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite. This composition is stable against thermal processing, thermal oxidation and discoloration, and it is especially useful for fibers and films. Further incorporation of a polycondensate of dimethyl succinate with 1-(2-hydroxyethyl)-4-hydroxy-2,2,6,6-tetramethylpiperidine is effective to inprove the light stability of the composition.

Abstract: A magnetic resonance diagnosing apparatus has a static magnetic field magnet, a gradient magnetic field coil, a transmitter/receiver probe, a Fourier transformer, a discriminator, a DC offset changer, and a controller. The Fourier transformer transforms a time-region magnetic resonance signal acquired by the transmitter/receiver probe to a frequency-region signal in accordance with Fourier transformation. The discriminator discriminates whether the line width of the frequency-region magnetic resonance signal is not more than a predetermined value. Based on the line width of the frequency-region magnetic resonance signal, the direct current offset changer adjusts the current to be supplied at least to the gradient magnetic field coil so as to correct the offset of the static magnetic field.

Abstract: In a spectroscopic imaging apparatus utilizing the magnetic resonance phenomenon, a spectroscopic image of phosphorus-31 within a slice portion of a biological body under examination is displayed in a materix form. Furthermore, a proton image of the slice portion is displayed in the same matrix form. In addition, a spectroscopic graph for a selected matrix element of the proton image is displayed.