Abstract: A method of eliminating discomforting flickering when viewing X-ray films in a light cabinet using fluorescent lamps, and a flicker-eliminating circuit for use in the light cabinet.

Abstract: A visual indicator for an X-ray field includes a light generator providing a beam of light. The light is provided to a first mirror that moves about an axis normal to the beam of light to deflect the beam. The deflected beam is applied to a second mirror that moves about an axis normal to the first axis and applies the beam of light to a mirror on the axis of the X-ray beam for reflection onto the X-ray field. The mirrors are controlled by signals indicative of the field defining collimator leaves to cause the light beam to trace out the field defining by the collimator leaves.

Abstract: An exemplary embodiment comprises an exposure unit including an X-ray tube and a cassette holder rotatable about vertical axes and between which the head of the patient is disposed. A radiation detector is disposed at the cassette holder for supplying an electrical signal corresponding to the dose rate when it is struck by X-rays and being interconnected with an X-ray tube voltage controller and a dose rate regulator in such manner that the X-ray tube voltage is influenced by the output of the radiation detector to control the dose rate to a value producing an optimum film blackening. A function generator determining the speed of the exposure unit is provided in which a speed curve is stored given which the radiation dose influencing the film is approximately constant.

Abstract: A diagnostic imaging system and process permits construction of an image of an area of an interfacial surface within the body of a subject, such as the heart-lung interface. The imaging system includes radiation source means for generating a shaped beam of penetrating radiation for illuminating the interfacial surface. Radiation scattered from tissue at the interface is detected by a plurality of directional radiation detectors which can be automatically positioned and oriented so that their fields of view intersect the beam of radiation and the interfacial surface.

Abstract: In the case of a patient support apparatus, a support, rotatably mounted about a horizontal spatial axis, is height-, longitudinally- and laterally-adjustable relative to an x-ray apparatus, whereby at least the height adjustment proceeds by a motor. In order, in the case of a lengthwise displacement of the patient support, to automatically conduct such a height adjustment that the isocenter moves along a path--capable of being established in advance--along the support, it is provided in accordance with the disclosure that a processor constantly determines, for the actual coordinates of the spatial axis and of the tilt angle .alpha. of the support, the height of a desired examination point and compares it with the height of the isocenter. A follow-up control coupled with the processor ensures a constant adaptation of these two values.

Abstract: An exemplary embodiment comprises a spot film device, a transport mechanism for the transport of an image layer carrier from a ready position into an exposure position and back, and a speed control for the drive motor. A certain time interval which is essentially caused by the transport operations always lies between triggering an X-ray exposure and the actual exposure of the image layer. In order to facilitate release of the X-ray exposure at the proper point in time, the disclosure provides that the overall transport time of the image layer carrier from the ready position into the exposure position is kept constant independently of the mass to be transported. Additionally, the transport time can also be kept constant independently of the different length of the transport path given sequencing of a sub-division program. An inventive X-ray examination device is particularly suited for employment in X-ray diagnostics.

Abstract: An improved PBL X-ray system in which the collimator is automatically adjusted so that the X-ray field size at an image receptor conforms to the image receptor size and the X-ray source to image receptor distance. Swivelling of the collimator in a plane parallel to the image receptor is detected and operation of the X-ray source is disabled. Manual operation may be obtained by removing the image receptor from its holder. Swivelling the collimator plus or minus 90.degree. exchanges the normally detected image receptor cross and longitudinal dimensions to automatically realign the collimator and image receptor axis. A PBL time delay is provided to prevent premature and undesired operation of the collimator shutters.

Abstract: The invention relates to carrying out a pre-adjustment, before photographing is started, in panoramic X-ray photography using an X-ray device which performs a rotational movement and supports a moving film and an X-ray source. The object is to achieve a correct positioning of the focus in relation to the patient. This is achieved without moving either the patient or the X-ray apparatus, or more precisely, merely by selecting the correct ratio between the film speed and the movement of the X-ray apparatus, instead of mechanical movement. In the apparatus, a viewing member is used, and the correct speed variation curve for the film during the photographing movement is selected on the basis of the position or reading of the viewing member. The film is reeled preferably by means of an electric motor, in which case a sensor can be connected to the sighting member, and the motor is controlled electronically according to the electric output signal of the sensor by means of, for example, a microprocessor.

Abstract: This disclosure relates to the improvement of a tomograph for photographing the entire jaws which is designed to make an X-ray photograph of a curved plane section of an object by changing the rotating output of a motor for driving a rotary arm by using an eccentric cam means to control a film feed speed by the rotary output thus change. This apparatus includes a tachogenerator for converting the rotating output of the rotary arm driving motor into an electric output, a voltage shunting means for shunting the output of the tachogenerator to three paths, a reference point correction circuit and a changeover resistance means, and is capable of providing a clear X-ray photograph of a patient in the range of adults to children without necessity to change the eccentric cams nor the position of the patient.

Abstract: A fluoroscopic table having a table top for supporting a patient for irradiation by X-rays generated by a source located beneath the table top, which X-rays are directed through the table top and patient to a receptor located above the patient, the receptor comprising a heavy image intensifier and spot filming device, for example, movable longitudinally and transversely of the table, and the X-ray source comprising a heavy X-ray generator and collimator which are movable as a unit longitudinally and transversely of the table for constant alignment with the receptor, the mountings for the receptor and source being separate from one another and the movements thereof being individually controlled by servo mechanisms whereby precise alignment is automatically achieved and maintained.

Abstract: In the exemplary embodiments the path of movement of the photographic exposure unit comprised of an x-ray tube and image layer (or film) carrier can be selected. For determination of the photographic exposure time, either an mAs-relay or an automatic exposure timer with a radiation detector may be placed in control of the energization of the x-ray tube. The x-ray tube current or the current of the radiation detector are integrated and the integrator contents are sampled at a predetermined time following commencement of the photographic exposure. The sampled value is compared with a reference value and the running speed of the photographic exposure unit is influenced in such a fashion that the photographic exposure time determined by the switching of the mAs-relay or by the automatic exposure timer approximately corresponds to the running time of the photographic exposure unit.

Abstract: In an exemplary embodiment, with a high voltage rectifier, two individual capacitors connected in series across the rectifier output, and radiation shielding surrounding the x-ray tube, the radiation shielding is connected with the connection line of the two individual capacitors in an electrically ungrounded fashion and the cathode of the x-ray tube is connected to ground.

Abstract: The disclosure relates to a dental radiographic apparatus for photographing the entire jaws having a rotary arm including an X-ray generator disposed in an opposed relation with an X-ray film feed means. The apparatus includes a means for detecting electrically the shape and characteristics of an object through the position of the rotary arm rotated and a means for automatically controlling the rotation speed of the arm and the feed speed of an X-ray film in response to the detection signal generated by the electrical detection means, whereby it is intended to provide a clear and sharp X-ray photographic image free from distortion, uniform in density and optional in rate of enlargement.