Abstract: An apparatus for measuring radio frequency output for a magnetic resonance imaging apparatus includes a plurality of directional couplers, a comparator, a switcher and a converter. The plurality of directional couplers are different in degree of coupling from each other, and attenuate an RF signal which is generated in an RF signal generator and amplified in an RF power amplifier. The comparator compares input-level information of a signal inputted into the RF power amplifier with a threshold value. The switcher switches to any one of the plurality of the directional couplers based on a result of the comparison so as to output an RF signal by the one directional coupler. The converter performs a digital conversion of the RF signal from the one directional coupler so as to output a digital signal.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes an amplifier, a capacitor bank, and processing circuitry. The amplifier supplies, based on an imaging sequence, an RF pulse to an RF coil which generates a radio frequency magnetic field. The capacitor bank supplies an electric power to the amplifier. The processing circuitry judges whether an imaging by the imaging sequence is able to be executed, based on a condition of the RF pulse in the imaging sequence and an output efficiency of the amplifier.

Abstract: A magnetic resonance imaging device according to an embodiment includes a gradient amplifier, a battery, a detector, and a battery controller. The gradient amplifier supplies electric power to the gradient coil. The battery is charged with electric power that is supplied from the power supply. The detector detects a high power output request on the gradient amplifier. The battery controller controls to supply electric power charged in the battery in addition to electric power supplied from the power supply to the gradient amplifier when the high power output request is detected.

Abstract: According to one embodiment, an MRI apparatus includes an amplifier and processing circuitry. The amplifier amplifies an RF pulse and outputs the amplified RF pulse to an RF coil. The processing circuitry performs correction processing on an envelope of an RF pulse to be inputted to the amplifier so as to compensate nonlinear input-output characteristics of the amplifier. As to this correction processing, the processing circuitry selects a correction information item out of a plurality of correction information items prepared for a corresponding plurality of imaging conditions and performs the correction processing by using the selected information item.

Abstract: A magnetic resonance imaging device according to an embodiment includes a gradient amplifier, a battery, a detector, and a battery controller. The gradient amplifier supplies electric power to the gradient coil. The battery is charged with electric power that is supplied from the power supply. The detector detects a high power output request on the gradient amplifier. The battery controller controls to supply electric power charged in the battery in addition to electric power supplied from the power supply to the gradient amplifier when the high power output request is detected.

Abstract: An apparatus for measuring radio frequency output for a magnetic resonance imaging apparatus includes a plurality of directional couplers, a comparator, a switcher and a converter. The plurality of directional couplers are different in degree of coupling from each other, and attenuate an RF signal which is generated in an RF signal generator and amplified in an RF power amplifier. The comparator compares input-level information of a signal inputted into the RF power amplifier with a threshold value. The switcher switches to any one of the plurality of the directional couplers based on a result of the comparison so as to output an RF signal by the one directional coupler. The converter performs a digital conversion of the RF signal from the one directional coupler so as to output a digital signal.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus provided with a plurality of transmission channels includes a signal processing unit and a control unit. The signal processing unit acquires a radio frequency magnetic field emitted from each of the plurality of transmission channels through a receiver coil mounted on an object and measure a phase of the radio frequency magnetic field. The control unit determines a phase difference between the plurality of transmission channels based on the phase of the radio frequency magnetic field of each of the plurality of transmission channels measured by the signal processing unit. The control unit controls a phase of a radio frequency pulse inputted to each of the plurality of transmission channels, based on the phase difference.

Abstract: In one embodiment, an MRI apparatus (20A) includes a data acquisition system (22, 24, 26, 28, 29, 40, 42, 44, 46 and 48), a charge/discharge element (BAT) and a power control unit (52 and 309). The data acquisition system acquires nuclear magnetic resonance signals from an imaging region by performing a scan. The charge/discharge element is a part of an electric power system (304, 308a, 52, BD and BAU) of the MRI apparatus, and is charged with external electric power. The power control unit controls the electric power system in such a manner that at least one unit excluding the data acquisition system is supplied with electric power from the charge/discharge element.

Abstract: In one embodiment, the image diagnosis apparatus (20) generates image data of an object by using external electric power, and includes a charge/discharge element (BA1, . . . BAn) and a charge/discharge control circuit (140, 152). The charge/discharge element is charged with the external electric power and supply a part of the consumed power of the image diagnosis apparatus by discharging. The charge/discharge control circuit controls charge and discharge of the charge/discharge element in such a manner that the charge/discharge element discharges in a period during which the consumed power is larger than a predetermined power amount and the charge/discharge element is charged in a period during which the consumed power is smaller than the predetermined power amount.

Abstract: A molecular simulation method for dividing a molecule or a part of molecule to be simulated into a QM space and an MM apace and applying an ab initio molecular orbital method to the QM space and a method based on an empirical potential to the MM space to perform molecular simulation includes the steps of: retrieving structure data on the molecule or part of molecule to be simulated from a storage unit, and dividing the structure data into the QM space and the MM space; and replacing a part of a total energy expression in the ab initio molecular orbital method concerning the QM space with an empirical potential.

Abstract: The trajectory of solutions is calculated by numerically integrating deterministic differential equations, and when sampling along this trajectory, it is set in such a way that a distribution obtained by combining a plurality of Tsallis distributions in which the solution of differential equations covers an energy range wider than that of a Boltzmann-Gibbs (BG) distribution can be reproduced. Several values are set to the parameter of the Tsallis distribution, and a distribution is obtained by combining Tsallis distributions each corresponding to a different parameter value. Using sampling points sampled from the trajectory obtained from the distribution obtained by combining a plurality of Tsallis distributions, the physical and chemical characteristics of a physical system according to the BG distribution can be calculated by a method of statistical mechanics.

Abstract: Peptide derivatives represented by the formula (I): ##STR1## which can specifically bind to modified LDL in competition with scavenger receptors on macrophages and are useful in diagnosing, preventing and treating circulatory diseases caused by accumulation of modified LDL in macrophages.

Abstract: Novel packing cases for image forming sheets are invented. An image forming machine, such as a color hard copying machine uses image forming sheets which are coated on their surfaces with image forming material. Since the image forming material easily comes off from the surface of an image forming sheet, the surface must be protected from physical contacts, particularly during transportation, handling, storing, etc. The novel packing cases are not only provided with protective sheets to protect image forming sheets accommodated in the packing case, but also with other inventive features to avoid any possible physical contacts with the surface of the image recording sheet.