Abstract: A power source supply system for a magnetic resonance imaging (MRI) apparatus that has multiple loads operating in a magnetic field environment, has an AC/DC conversion circuit that converts a supplied AC current to a first DC current having a predetermined first voltage, a branching element that supplies the first DC current in separate paths respectively to the multiple loads, a switching power source, disposed in each of the loads that converts the first DC current to a second DC current having a second voltage capable of being supplied to the load, with a switching frequency of the switching power source being set such that a positive integer frequency multiple thereof is offset from the Larmor frequency of the MRI apparatus.

Abstract: A power source supply system for a magnetic resonance imaging (MRI) apparatus that has multiple loads operating in a magnetic field environment, has an AC/DC conversion circuit that converts a supplied AC current to a first DC current having a predetermined first voltage, a branching element that supplies the first DC current in separate paths respectively to the multiple loads, a switching power source, disposed in each of the loads that converts the first DC current to a second DC current having a second voltage capable of being supplied to the load, with a switching frequency of the switching power source being set such that a positive integer frequency multiple thereof is offset from the Larmor frequency of the MRI apparatus.

Abstract: In a field-programmable gate array (FPGA) configuration circuit, and a radio-frequency unit and a magnetic resonance system having a configuration circuit, the configuration circuit has at least two FPGA modules, each FPGA module being individually connected to a bus; at least two storage devices, each storage device storing a configuration file; one of the at least two FPGA modules being connected to the at least two storage devices separately, and an input end, connected separately to the at least two storage devices. A selection signal is provided for selecting one of the at least two storage devices. The FPGA module connected to the at least two storage devices reads a configuration file stored in a storage device selected on the basis of the selection signal, and sends, via the bus, the configuration file that has been read to the FPGA module other than the FPGA module connected to the at least two storage devices.

Abstract: In a field-programmable gate array (FPGA) configuration circuit, and a radio-frequency unit and a magnetic resonance system having a configuration circuit, the configuration circuit has at least two FPGA modules, each FPGA module being individually connected to a bus; at least two storage devices, each storage device storing a configuration file; one of the at least two FPGA modules being connected to the at least two storage devices separately, and an input end, connected separately to the at least two storage devices. A selection signal is provided for selecting one of the at least two storage devices. The FPGA module connected to the at least two storage devices reads a configuration file stored in a storage device selected on the basis of the selection signal, and sends, via the bus, the configuration file that has been read to the FPGA module other than the FPGA module connected to the at least two storage devices.

Abstract: A milling cutter includes a cutting portion including a depression portion and a sidewall surrounding the depression portion, wherein an exterior surface of the sidewall is a cylindrical surface, each of two parts of an internal surface of the sidewall is a slanted surface, so as to form two teeth. The cutting portion is a cylinder with a free end cut off by two virtual surface whose sectional view is V-shaped to form two teeth symmetrical with each other, and the depression portion is defined in the free end.

Abstract: The invention proposes a method and an apparatus for testing a magnetic field of a coil. The method comprises applying an alternating current to the coil to generate an alternating magnetic field; measuring simultaneously the induced electromotive potential at a plurality of positions in the alternating magnetic field; and collecting and processing signals of the induced electromotive potential so as to obtain said coil's magnetic field distribution. The apparatus comprises probes positioned in said alternating magnetic field to generate the induced electromotive potential; a multi-channel data acquisition card for collecting the signals of the potential; and a processor for processing the collected signals to obtain said coil's magnetic field distribution. The method and the apparatus eliminate the interference by the magnetic field of the earth by testing the coil's alternating magnetic field to improve test accuracy and to improve the testing efficiency by multi-channel acquisition of the test signals.

Abstract: A milling cutter includes a cutting portion including a depression portion and a sidewall surrounding the depression portion, wherein an exterior surface of the side wall is a cylindrical surface, at least a part of an internal surface of the side wall is a slanted surface, so as to form at least one tooth.

Abstract: A method for calendaring an activity based on roles, including the steps of acquiring a request for calendaring the activity for a plurality of roles invited to attend the activity; acquiring data on existing activities which have been calendared for all the specific individuals in the plurality of roles invited to attend the activity; and determining the time interval for holding the activity based on the data on existing activities which have been calendared for all the specific individuals in the plurality of roles invited to attend the activity and the request for calendaring the activity.