J. Morita Manufacturing Corporation

Nihon University

Makoto Honjo

Masakazu Suzuki

Takahiro Yoshimura

Hideki Yoshikawa

Yoshinori Arai

Masanori Otsuka

Masaya Tatsumi

Takeshi Hayashi

Susumu Kirimura

Susumu Kimura

An X-ray photography apparatus including: a turning arm that supports an X-ray generator and an X-ray detector which are opposed to each other so that the head of a patient can be interposed therebetween, and a moving mechanism that includes a turning part and a moving part. The turning part turns the turning arm about a turning axis with respect to the head. The moving part moves the turning arm relative to the head in a direction perpendicular to the turning axis. The X-ray photography apparatus also includes: an image processor that generates an X-ray image, a photographic region designation part that designates part of a row of teeth along a dental arch as a pseudo intraoral radiography region, and an X-ray forming mechanism that changes the irradiation direction in which the head is irradiated with an X-ray relative to the axial direction of the body axis of the patient.

X-ray photography apparatus

The present invention has an object of providing an X-ray CT imaging device which can direct X-ray to an area of interest appropriately even when, for example, the height of the area of interest with respect to the X-ray detector, which is revolving, varies with respect to the revolution direction, and thus can reduce the amount of unnecessary exposure to the X-ray and can perform X-ray imaging of the area of interest with certainty. In an X-ray CT imaging device for performing X-ray CT imaging of a CT imaging area of a subject, during the X-ray CT imaging when a revolving arm is revolving, the expansion in a length direction of an X-ray cone beam, which is to be restricted by length direction blocking plates, is adapted to the shape of the CT imaging area in accordance with the revolution position of the revolving arm.

X-ray CT imaging device

In an X-ray imaging apparatus that performs X-ray CT imaging, an X-ray generator () that generates an X-ray cone beam (BX) and an X-ray detector () that detects the X-ray cone beam (BX) radiated to an object (specifically, image object (OB)) are revolved for 180 degrees to be opposed to each other with the object being located therebetween. Further, the X-ray generator () is moved such that a revolution reference point (CP) that is set on an optical path (CB) of the X-ray cone beam (BX) goes round of a predetermined oval shape while the X-ray detector () and the X-ray generator () are revolved for 180 degrees. Setting is made such that a CT image area (CA) to be imaged by the irradiation of the X-ray cone beam (BX) has an approximately triangular shape through the above-mentioned operation.

X-ray imaging apparatus

A medical X-ray apparatus comprising a supporting part for supporting an X-ray generator and a two-dimensional X-ray detector while interposing an object to be examined therebetween, a radiation area restricting part for restricting a radiation area of X-ray generated from the X-ray generator, and a scan driving part for scanning the object with the X-ray restricted by the radiation area restricting part as X-ray beam and for executing radiography. A direction intersecting with X-ray scan direction is defined as a height direction, the apparatus further comprises a radiation area setting part for setting at least one of both ends of width of the X-ray beam in the height direction at a desired position in accordance with the position of an interested area of the object; and the X-ray beam is irradiated only to the radiation area as set by the radiation area setting part with its beam width in height direction restricted by the radiation area restricting part.

Medical X-ray apparatus

An X-ray imaging apparatus includes an X-ray generation part, an X-ray detection part, and a revolution drive mechanism. The X-ray generation part has an X-ray generator including a cathode and an anode, and emits an X-ray beam from the X-ray generator. The X-ray detection part detects the X-ray beam. The revolution drive mechanism performs X-ray imaging by revolving the X-ray generation part and the X-ray detection part around the object while the X-ray generation part and the X-ray detection part are opposed to each other with said object interposed therebetween. The X-ray imaging apparatus controls a restriction part to thereby restrict an X-ray transmission in such a manner that the focal spot size of an X-ray beam used in X-ray CT imaging of a relatively narrow imaging region is smaller than the focal spot size of an X-ray beam used in X-ray CT imaging of a relatively large imaging region.

In an X-ray CT imaging, an X-ray generator () and a two-dimensional X-ray detector () are opposed to each other between an object and are rotated by a rotary shaft () around the object. At least one of the rotary shaft supporter () and an object holder () includes a movement mechanism () for moving a supporter () for the X-ray generator and the X-ray detector relative to the object. In offset scan CT imaging, the rotation of the supporter by the rotary shaft is performed simultaneously with the relative two-dimensional movement of the rotary shaft by the movement mechanism. In the relative two-dimensional movement, the position of the rotary shaft is moved according to the rotary angle of the supporter along a circular orbit around the center of a CT imaging region in a plane crossing the rotary shaft. Thus, it becomes possible to image a larger region of interest of the object.

X-ray CT imaging apparatus

A unit for X-ray CT imaging to be set in a panorama X-ray imaging apparatus having a cassette holder has a digital sensor cassette for CT imaging to be set in the cassette holder, includes a two-dimensional X-ray detector for acquiring X-ray projection data for CT imaging of an object, and a controller for controlling a timing of X-ray CT imaging, a radiation field of X-ray beam generated by the X-ray detector, and the rotary device. Alternatively, the unit has the digital sensor cassette for X-ray CT imaging, an image reconstructor which calculates to convert the X-ray projection data obtained with the two-dimensional X-ray detector to a distribution of X-ray absorption coefficients of the object and creates tomographic image data of sections of the object, and an image processor which sends and receives signals for X-ray CT imaging between the X-ray detector and the image reconstructor when the digital sensor cassette for CT imaging is set in the cassette holder.

Unit for X-ray CT imaging and X-ray imaging apparatus

An X-ray detecting section () comprises a first imaging means (S) to generate an X-ray image in response to the X-ray slit beam (B) and a second imaging means (S) to generate an X-ray image in response to the X-ray broad beam (BB). The radiography apparatus (M) displays a first X-ray image generated by the X-ray slit beam (B) and said first imaging means (S), specifies a desired interested area (R) on the first X-ray image, and generates a predetermined sectional image as a second X-ray image by using the X-ray broad beam (BB) and the second imaging means (S) with respect to the specified interested area (R).

Radiography apparatus with scout view function

Radiography apparatus for dental treatment

There is provided a new X-ray imaging apparatus by the use of which X-ray CT and panoramic imaging can be effectively performed. In an X-ray imaging apparatus which rotates an X-ray generating section and an X-ray detecting section around an imaging object arranged between these X-ray generating section and the X-ray detecting section and also detects in the X-ray detecting section X-rays having been radiated from the X-ray generating section and transmitted through the imaging object to form an X-ray image, a panoramic imaging mode in which the X-ray generating section and the X-ray detecting section are driven to form a panoramic image of the imaging object and an offset scan/CT mode in which the X-ray generating section and the X-ray detecting section are driven to form a tomographic image of the imaging object are set, so as to selectively execute these two imaging modes. Consequently, the panoramic imaging mode and the offset scan/CT mode can be arbitrarily selected, thereby allowing formation of an X-ray imaged image that is optimum for treatment.

X-ray computer tomography apparatus

A two dimensional image production method by using a solid-state image sensing device, wherein the solid-state sensing device comprises a picture element producing part where electric charges generated by way of photo-electric conversion when receiving exposure is stored as charge signals, and a dark current measuring part where a dark current is stored without receiving exposure. The method comprising the steps of: preparing and storing in advance the output ratio data for a fixed exposure time between dark current component of each pixel element or each pixel element column in the picture element producing part and that of a specified pixel element or a specified pixel element column in the dark current measuring part, and producing sequentially pixel datum removed a dark current component while performing radiography, by executing a predetermined arithmetic operation for the signals of the electric charges outputted from the picture element producing part depending on the output ratio data.

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Kyoto, Japan

Makoto Honjo