Kabushiki Kaisha Toshiba

Toshiba Medical Systems Corporation

Masateru Iwasa

Yoshitomo Sakakura

Kazuto Nogami

Tomoyuki Yoshida

Hidekazu Tanaka

Fumitoshi Kojima

Kohei Adachi

Makoto Sato

Shigehide Kuhara

Satoshi Sugiura

Hiroshi Sugimoto

Koji Kitamura

Yutaka Kato

Yasutake Yasuhara

Taketo Kawakami

Takashi Yanashima

A magnetic resonance diagnostic apparatus is configured in such a manner that: a high-frequency transmission coil transmits a high-frequency electromagnetic wave at a magnetic resonance frequency to an examined subject; a heating coil performs a heating process by radiating a high-frequency electromagnetic wave onto the examined subject at a frequency different from the magnetic resonance frequency; based on a magnetic resonance signal, a measuring unit measures the temperature of the examined subject changing due to the high-frequency electromagnetic wave radiated by the heating coil; and a control unit exercises control so that the measuring unit measures the temperature while the heating coil is performing the heating process, by ensuring that the transmission of the high-frequency electromagnetic wave by the high-frequency transmission coil and the radiation of the high-frequency electromagnetic wave by the heating coil are performed in parallel.

Magnetic resonance diagnostic apparatus

According to one embodiment, a magnetic resonance imaging apparatus includes a static magnetic-field generating unit, a gradient magnetic-field generating unit, a plurality of metal shim plates in a plate shape, and a shim holding unit. The metal shim plates adjust uniformity of the static magnetic field. The shim holding unit holds the metal shim plates in a layered state. Each of the metal shim plates includes a convex having a certain angle at a certain position, and the metal shim plates are layered such that the convex of each one metal shim plate comes into contact with a back of the bent convex of another metal shim plate.

Magnetic resonance imaging apparatus and shimming apparatus with convex to concave layered stacking of shim plates

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.

Magnetic resonance imaging apparatus and gradient coil cooling control method

Growing community of inventors

Yokohama, Japan

Masateru Iwasa