Abstract: X-ray diagnostic apparatus is disclosed which includes a video camera; at least one image memory (12); one subtraction stage (13) for producing subtraction images by forming the difference from a stored video signal and a video signal chronologically following the stored video signal; an evaluation circuit (14 to 21) for evaluating the time of the difference signal; and a color video monitor (7). The evaluation circuit (14 to 21) contains a time stage (15) and a color converter (14). The color converter (14) is directly coupled to the subtraction stage (13) and converts the subtraction image into a black and white (monochrome) intensity image whose image color is controlled by the time stage (15) in dependence upon the chronological occurrence of the subtraction image. The color converter (14) has one output for each of the primary colors (red, green, blue). One memory (16 to 18) is coupled to each of these outputs for the storing of the output signals of the color converter (14) by summation.

Abstract: A stereo X-ray subtraction apparatus has a stereo X-ray system and an X-ray image intensifier television chain in which, for each channel, the video signals of successive stereo partial images are summed in a weighted fashion in a first image memory, the output of the first image memory being supplied to a first input of a first subtraction stage, with the output of the first image memory in the other channel being supplied to a second input of the first subtraction stage, the output of the first subtraction stage being supplied to a second image memory and to a first input of a second subtraction stage, and the output of the second image memory being supplied to a second input of the second subtraction stage. The outputs of the second subtraction stages for each channel are supplied to a display unit for displaying the resulting stereo image.

Abstract: An exemplary embodiment comprises an image intensifier television chain, a subtraction device which has at least one image memory and a difference stage for providing subtraction images through difference formation from the stored video signals and chronologically displaced video signals, and a monitor. There is series connected with the subtraction device a circuit with a high-pass filter characteristic for the purpose of two-dimensional spatial frequency filtering.

Abstract: The disclosure proceeds from the fact that, even in the case of the most painstaking selection of the hardness of X-rays employed for the purpose of irradiation of heterogenously composed specimens, such as, for example, body parts interspersed with bones, no video image which is entirely satisfactory in all parts is obtained. An image is desirable in which the fine contrasts of soft parts appear just as clearly as those of parts which, such as bones, for example, strongly absorb X-rays. To this end the disclosure provides that image signals, which are generated with X-rays of various hardnesses; for example, such of more than 100 kV and such of less than 60 kV, be stored, and that therefrom the respectively favorably represented surface elements be joined together to form a resultant image. The disclosed embodiment is particularly suited for use in medical X-ray diagnostics.

Abstract: An exemplary embodiment comprises at least one X-ray source for the generation of an X-ray beam, a control generator for effecting movement of the X-ray beam, a patient support, an X-ray image intensifier which is surrounded by deflection coils which are connected with a deflection circuit (connected to the control generator) for effecting the synchronous movement of the electron image in the X-ray image intensifier, and a television chain coupled to the output of the X-ray image intensifier, in which the deflection coils consist of n coil pairs offset relative to one another in one plane, whereby n amounts to at least three. The deflection device is so designed that the deflection current flows only in respectively two of the n coil pairs.

Abstract: An exemplary embodiment includes a television pickup installation, image storage circuitry, a difference stage for the subtraction of two chronologically successively obtained image data signals through difference formation and a monitor. An address computer is connected with the output of the difference stage and has outputs connected to the address inputs of the image storage circuitry. The computer alters in a step-wise fashion the allocation of the image point data to be compared in the difference stage (13) until a minimum of the difference formed during the subtraction of two images results.

Abstract: An exemplary embodiment comprises an image intensifier television chain which includes an X-ray image intensifier, an optical coupler, a camera tube, a video amplifier, and a monitor, and also has a control loop for exposure control which includes a control circuit for the formation of a control voltage for controlling the dose rate of the x-ray tube. A dominant-field-responsive circuit evaluates the video signal and includes a device for blanking-out portions of the video signal for the formation of a dominant field. An actual value transmitter is connected in circuit between the photocathode of the X-ray image intensifier and a high voltage generator therefor, so as to supply to the control circuit an actual value signal corresponding to the mean image brightness.

Abstract: In an exemplary embodiment, video images from a television pickup device corresponding to the x-ray images are supplied to an image store and to a difference stage for the purpose of providing subtraction images through difference formation from the stored and the current video signal. The difference stage is connected with a first adder which in turn is connected with a second image store, whose output signal is supplied to a first adder, so that the image point data of the difference stage are summed in the second image store. The output signal of the second image store is supplied to the monitor.