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EP0051430A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

X-Ray apparatus

Assignee: Toshiba Corp
•
Filing: 1981-10-27
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Granted: —
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Expires: 2001-10-27
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Abstract

Abstract X-ray stereoscopic cinematography apparatus uses an X-ray tube (1) having a pair of focal points (fr and fl) on the anode (P), from which X-ray beams can be radiated independently. Focal points (fr and fl) are spaced by the inter-ocular distance. The X-ray beams are directed through an object (2) such as a patient, and are received by an image intensifier (3) which emits an optical image received by an optical system (4). The optical beam can be diverted to either or both of cinecameras (5 and 6) for receiving "right" and "left" images. A television camera (7) is arranged to receive both images. The shutters of the cinecameras are synchronised but are 180° out of phase, so that both shutters are never open at the same time. Mode selector (8) can select a stereoscopic radiographic mode, a mono-scopic radiographic mode or a fluoroscopic mode. When the first is selected, X-ray beams are emitted alternately from the focal points (fr and fl) in synchronism with the shutters of the cinecameras (5, 6) so that the first cinecamera (5) receives only "right" images and the other cinecamera (6) receives only the "left" images. In the mono-scopic radiographic mode, X-ray beams are emitted from only one of the two focal points and only one of the cinecameras is activated. In the fluoroscopic mode, X-ray beams from only one of the focal points is emitted, neither cinecamera is activated and the optical image is received only by the television camera (7).

Inventors

  • 👤 Kohsaku Patent Division Nishio

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-28 12:08
CPC Classifications
A; A61; A61B; A61B6/00; G; G03; G03B; G03B42/00; G03B42/02; H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/045; H01J35/24; H05; H05G; H05G1/00; H05G1/08; H05G1/58; H05G1/60; H01J2235/00; H01J2235/06; H01J2235/068

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 240 words
X-ray apparatus employing an X-ray tube designed to radiate X-rays from at least two focal points independently, the apparatus comprising a converter for converting an X-ray image derived by means of X-rays from the tube to an optical image; an optical system for projecting the optical image, the system including a first half-mirror and a second half-mirror which is arranged to receive light from the location of the first half-mirror, each of the half-mirrors being movable between an operative position in the light path and an inoperative position out of the light path; first and second cinecameras arranged to receive the optical image when the first half-mirror and second half-mirror respectively is in operative position; means for synchronising the drives of the cinecameras so that their shutters are opened alternatively and so that the shutters are never open simultaneously; a television camera also arranged to receive the optical image projected by the optical system; mode setting equipment to select a stereoscopic cinematography mode, a mono-scop ic cinematography mode, or a fluoroscopy mode; radiographic control means controlled by the setting equipment for controlling the drive of the cinecameras, and for generating X-ray exposure switching signals synchronised with the shutter movements of the cinecameras; and a switching controller for the X-ray tube which controller is operated by the switching signals and which is designed to control the X-rays radiated from each of the focal points when the stereoscopic cinematography mode is selected.
Claim 2
Dependent Claim 240 words
X-ray apparatus employing an X-ray tube designed to radiate X-rays from at least two focal points independently, the apparatus comprising a converter for converting an X-ray image derived by means of X-rays from the tube to an optical image; an optical system for projecting the optical image, the system including a first half-mirror and a second half-mirror which is arranged to receive light from the location of the first half-mirror, each of the half-mirrors being movable between an operative position in the light path and an inoperative position out of the light path; first and second cinecameras arranged to receive the optical image when the first half-mirror and second half-mirror respectively is in operative position; means for synchronising the drives of the cinecameras so that their shutters are opened alternatively and so that the shutters are never open simultaneously; a television camera also arranged to receive the optical image projected by the optical system; mode setting equipment to select a stereoscopic cinematography mode, a mono-scop ic cinematography mode, or a fluoroscopy mode; radiographic control means controlled by the setting equipment for controlling the drive of the cinecameras, and for generating X-ray exposure switching signals synchronised with the shutter movements of the cinecameras; and a switching controller for the X-ray tube which controller is operated by the switching signals and which is designed to control the X-rays radiated from each of the focal points when the stereoscopic cinematography mode is selected.
Claim 3
Dependent Claim 54 words
X-ray apparatus as claimed in claim 1, in which each of the second cinecamera and the television camera has, or is associated with, an adjustable diaphragm controlling the level of light entering the respective camera, and the radiographic control means is arranged to control the diaphragms according to the positioning of the half mirrors.
Claim 4
Dependent Claim 59 words
X-ray apparatus as claimed in claim 1 or claim 2, in which the switching controllers includes an independent X-ray tube grid control circuit for independently controlling the potential on each of the two grids of the X-ray tube in response to the switching signals, in order to perform on- off control of the radiations from the two focal points.
Claim 5
Dependent Claim 17 words
X-ray apparatus as claimed in claim 3, in which each X-ray grid control circuit includes a tetrode.
Claim 6
Dependent Claim 19 words
X-ray apparatus as claimed in any one of the preceding claims, in which the converter is an image intensifier.

References Cited (Backward Citations)

US3244878A Cited
US3424901A Cited
DE1262772B Cited
US3684354A Cited
DE2062430A1 Cited
GB2034967A Cited
US4287420A Cited

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