Canon Kabushiki Kaisha

Miki Tamura

Kazuyuki Ueda

Yoshihiro Yanagisawa

Shuji Aoki

Masaru Kamio

Ichiro Nomura

Hideaki Takao

Nobuyuki Sekimura

Tatsuo Murata

Keisuke Yamamoto

Takao Ogura

Yasue Sato

Junichiro Kanbe

Masataka Yashima

Tsuyoshi Santoh

Yoshiki Kikuchi

Chieko Mihara

Hiroyuki Sugata

Kazuhiro Sando

Tetsuya Kaneko

Mitsutoshi Hasegawa

Yasuhiro Hamamoto

Kazuhiro Jindai

Osamu Kanome

Osamu Takamatsu

Noriaki Ohguri

Toru Sugeno

Toshihiko Takeda

Masao Suzuki

Tetsuro Fukui

Toshikazu Ohnishi

Masataka Yamashita

Koji Yamazaki

Tsuyoshi Santo

Hitoshi Oda

Kenji Kagami

Hideshi Kawasaki

Shigeki Matsutani

Tamayo Hiroki

Yukitoshi Okubo

Katsuya Nishino

Takeo Tsukamoto

Takayuki Yagi

Yutaka Arai

Motokazu Kobayashi

Kazuya Miyazaki

Masahiro Fushimi

Mizuho Hiraoka

Masatake Akaike

Tsyuoshi Santoh

Kobayashi Motokazu

A computed tomographic mammography system is provided with, as an X-ray tubeA, a transmission type X-ray tube including a targetwhich includes a target layerthat generates X-ray upon irradiation of an electron beam and a supporting substratethrough which the X-ray generated upon irradiation of the electron beam to the target layerpasses, an electron emission sourcefor emitting an electron beam toward the target layer

Computed tomographic mammography system

Provided is an X-ray generator including an electron passage in an electron-passage forming member; and a target on an insulative substrate. The transmission X-ray generator irradiates the target with electrons that have passed through the electron passage to generate X-rays. The target is provided at a central region of the substrate; the electron passage accommodates a secondary-X-ray generating section that generates X-rays by irradiation with electrons reflected from the target; the secondary-X-ray generating section and the target are disposed so that both of X-rays generated by direct irradiation of the target with the electrons and X-rays generated by irradiation of the secondary-X-ray generating section with the electrons reflected from the target are radiated to the outside; and at least part of the peripheral region of the substrate has higher transmittance for the X-rays generated at the secondary-X-ray generating section than the central region of the substrate.

X-ray generator and X-ray imaging apparatus

A radiation generating apparatus includes: an envelopehaving a first windowthrough which a radiation is transmitted; and a radiation tubebeing held within the envelope, and having a second windowwhich is arranged in opposition to the first window, and through which the radiation is transmitted; and a radiation shielding memberthermally connected to the second window, having a radiation transmitting holearranged in communication with the second window, and having a protruding portion protruding from the second windowtoward the first window. A thermally conductive memberhaving a higher thermal conductivity rather than that of the radiation shielding memberis connected to the protruding portion of the radiation shielding member. The radiation generating apparatus can shield an unnecessary radiation and cool a target with a simple structure and is entirely reduced in weight.

Radiation generating apparatus and radiation imaging apparatus

A multi-source radiation generator in which plural radiation sources are arranged in series includes a control unit that controls a dose of radiation emitted from each of the radiation sources depending on positions of the radiation sources, and reduces variation in a radiation dose resulting from differences in positions of the radiation sources by changing an irradiation time, an anodic current value of each of the radiation sources depending on a distance from each of the radiation sources to a subject.

Multi-source radiation generator and radiography system

A radiation generating apparatus of the present invention includes an envelopeincluding a first windowallowing radiation to pass; a radiation tubethat is accommodated in the envelope, and includes a second windowallowing radiation to pass, at a position opposite to the first window; a radiation passing holethat is thermally connected to the second windowand communicates with the second window; and a radiation shielding memberprotruding from the second windowtoward the first window. In this apparatus, a thermally conductive memberhaving a higher thermal conductivity than the radiation shielding memberis connected to an outer periphery of the protruding portion of the radiation shielding member. The simple configuration can shield unnecessary radiation, and cool the target, while facilitating reduction in weight.

In an X-ray generation apparatus of transmission type including an electron emission source, and a target generating an X-ray with collision of electrons emitted from the electron emission source against the target, the X-ray generation apparatus further includes a secondary X-ray generation portion generating an X-ray with collision of electrons reflected by the target against the secondary X-ray generation portion, and the secondary X-ray generation portion and the target are arranged such that the X-ray generated with the direct collision of the electrons against the target and the X-ray generated with the collision of the electrons reflected by the target against the secondary X-ray generation portion are both radiated to an outside. X-ray generation efficiency is increased by effectively utilizing the electrons reflected by the target.

X-ray generation apparatus and X-ray radiographic apparatus

A multiradiation generation apparatus according to the present invention includes a plurality of radiation sources arranged in a row. Each of the radiation sources includes an electron source configured to emit electrons and a target unit configured to generate radiation upon receiving electrons emitted from the electron source. At least one of the radiation sources is a dual-purpose radiation source used for both tomosynthesis imaging and non-tomosynthesis imaging, and the other radiation sources are single-purpose radiation sources used only for tomosynthesis imaging.

Multiradiation generation apparatus and radiation imaging system utilizing dual-purpose radiation sources

There is provided a radiation generating apparatus having a simple structure and capable of shielding unnecessary radiation, cooling a target, reducing the size and weight of the apparatus, and achieving higher reliability, and a radiation imaging apparatus having the same. A transmission type radiation tube is held inside a holding container filled with a cooling medium. The transmission type radiation tube includes an envelope having an aperture, an electron source arranged inside the envelope so as to face the aperture of the envelope, a target unit for generating a radiation responsive to an irradiation with an electron emitted from the electron source, and a shield member for shielding a part of the radiation emitted from the target unit. The cooling medium contacts at least a part of the shield member.

A radiation generating apparatus has a radiation generating tube held in a holding containerand a cooling medium between the holding container and the radiation generating tube. The radiation generating tube includes an envelope with an aperture, an electron emitting source arranged in the envelope, a target arranged facing the source, for generating radiation responsive to irradiation with an electron beam emitted from the source, and a tubular shield for holding the target by an inner wall thereof and shielding part of the radiation emitted from the target. The shield is arranged to protrude outward of the envelope so that the target is positioned on an outer side of the aperture, and the cooling medium contacts at least a part of the shield.

In a radiation generating apparatus of the invention, a radiation tube having a cathode for emitting an electron and an anode for generating a radiation by an irradiation of the electron emitted from the cathode is enclosed in a housing container filled with an insulating liquid. The apparatus has a mechanism in which a voltage for allowing the insulating liquid to flow can be applied between the cathode and the anode in a state where the cathode does not emit any electron. Even when the generation of the radiation is stopped, the insulating liquid can be efficiently sufficiently cooled without providing mechanical stirring means, and a high reliability is obtained even for intermittent use.

Radiation generating apparatus and radiographing system using the same

A radioactive ray generating apparatus includes a second shielding member, a target, and a first shielding member, which are sequentially disposed from an electron emission source side. A shortest distance from a maximum radiation intensity portion of the target to the first shielding member is shorter than a shortest distance from the maximum radiation intensity portion of the target to the second shielding member.

Radioactive ray generating apparatus and radioactive ray imaging system

A radiation generating apparatusaccording to the present invention including: a radiation generating tubehaving a target, a tubular shielding memberthat shields a part of a radiation generated from the targetand also has an aperturethrough which the radiation generated from the targetpasses, and an envelopethat has the targetso as to be brought into contact with the internal space thereof and also has the tubular shielding memberso as to protrude toward an external space thereof; a storage containerfor storing the radiation generating tubetherein; and an insulating liquidthat comes in contact with the tubular shielding memberand the storage container, wherein the tubular shielding memberhas a protruding portion P, and the protruding portion P is covered with a solid insulating member

Radiation generating apparatus and radiation imaging apparatus using the same

In a radiation imaging apparatus, an envelope has a first window for transmitting radiation and is filled with an insulating liquid, and a radiation tube in the envelope has, at a position facing the first window, a second window for transmitting the radiation, and a shielding member. A solid insulating member is arranged between the shielding member and the inner wall of the envelope, and an opening is formed at a position on the insulating member corresponding to the first window. The shortest distance from the shielding member to the first window or the inner wall of the envelope through the opening of the insulating member without the insulating member is made to be longer than the shortest distance from the shielding member to the first window or the inner wall of the envelope through the insulating member, thereby improving withstand voltage performance without reducing an radiation amount.

Provided is an X-ray generator comprising an X-ray tube including a cylindrical body; an electron source in the body; a target at an end of the X-ray tube facing the electron source, the target generating X-rays by irradiation with electrons; a container in which the X-ray tube is arranged; insulating liquid filled between the X-ray tube and the container; and

X-ray generator tube having improved cooling container and X-ray imaging apparatus including the same

The present invention relates to a radiation generating apparatus which includes an envelope provided with a first window through which radiation is transmitted, a radiation tube housed in the envelope and provided with a second window through which the radiation is transmitted, the second window being located at a position opposite the first window, and an insulating fluid adapted to fill the space between the inner wall of the envelope and the radiation tube. Plural plates are arranged side by side between the first window including its periphery and the second window including its periphery, and overlapping one another with gaps between them. The gaps are formed among the plates, and thereby the withstanding voltage between the first window and second window is made larger.

Growing community of inventors

Kawasaki, Japan

Miki Tamura