Hitachi Medical Corporation

Other

Hitachi, Ltd.

Mitsubishi Denki Kabushiki Kaisha

Hiroshi Tazaki

Hirotaka Takeshima

Hajime Kawano

Takeshi Yatsuo

Hajime Tanabe

Takao Honmei

Shigenori Kuroda

Noriaki Hino

Shigeru Kakugawa

Akiyoshi Komura

Nobuhiro Hara

Takao Hommei

Shouji Kitamura

Takashi Ishiguro

Kazuki Moritsu

Fumitaka Takahashi

Ken Ishikawa

An open-type magnet device for MRI includes a pair of upper and lower magnet assemblies, and shims are provided on opposite sides of their cooling containers and/or in holes passing through central portions of the cooling containers so as to facilitate providing a highly homogeneous static magnetic field.

Open-type magnet device for MRI

A magnet device includes two sets of static magnetic field generation sources spaced from each other in the vertical direction such that the uniform magnetic field region (patient space) is between then. Each set has concentric current carrying coils to generate a uniform magnetic field in a first direction (the vertical direction). Several such coils are used in each set, disposed such that when a first axis which is parallel to the first (vertical) direction and passes substantially through the centers of the current carrying coils crosses, at a first point, a second axis which is orthogonal to the first axis and is at substantially equal distance from the respective static magnetic field generation sources, the current carrying coils are disposed in such a manner that when geometrical centers of cross sections of the current carrying coils are projected on a first straight line that is in a first plane containing the first axis, the second axis and the first point and passing through the first point, the directions of the currents of the carrying coils at the respective corresponding projections align alternatively in positive and negative directions on the first straight line.

Magnet apparatus and mri apparatus

A superconducting magnet apparatus. By forming one or more holes in each of platelike ferromagnetic substances forming a magnetic shield for focusing the magnetic flux generated by superconducting coils, the flow of lines of magnetic flux is adjusted. Thereby, a static magnetic field in a measurement space is corrected. By disposing coupling tubes for supporting two cooling vessels housing superconducting coils on the rear side with respect to a central axis (Z axis) of the measurement space of the vertical direction, access to the subject is facilitated. In addition, the magnetic shield has an opening portion wider than the superconducting magnet on its side face. After the magnetic shield has been assembled, the superconducting magnet can be inserted from the opening portion.

Superconducting magnetic apparatus

Open MRI system with a vertical static field and an imaging volume closer to the lower than to the upper magnet assembly

Superconducting magnetic device

An X-ray radiograph apparatus comprising an X-ray source which irradiates a subject body with X rays of a low level radiation dose during the fluoroscopic operation and irradiates the same with X rays of a high level radiation dose during the radiographic operation; an X-ray image intensifier for converting an X-ray image, which has irradiated by the X-ray source and has penetrated through the subject body, into an optical image; a distributor for distributing an output optical image from the X-ray intensifier to a plurality of optical paths; a fluoroscopic imaging element arranged on one of plural output optical paths of the distributor; a radiographic imaging element arranged on an output optical path of the distributor other than the output optical path on which the fluoroscopic imaging element is arranged, the radiographic imaging element having a higher resolution than the fluoroscopic imaging element and having a lower imaging speed than the fluoroscopic imaging element; and an image display for displaying a fluoroscopic image or a radiographic image formed based on output signals from the fluoroscopic imaging element or the radiographic imaging element, respectively. With this, it becomes possible to collect, at the same time, the high resolution static image (radiographic image) by the radiographic imaging element and the moving image (fluoroscopic image) by the fluoroscopic imaging element. It is also possible to improve the S/N ratio of the radiographic image. Furthermore, should the radiographic image element include a defect pixel, the influence thereby would be lowered to minimum or to zero.

X-ray radiograph apparatus

Growing community of inventors

Kashiwa, Japan

Hiroshi Tazaki