Abstract: An eight bit binary address signal is generated in response to a selected time station, X-ray tube, focal spot and anode rotation speed which is then used to address a read only memory (ROM) pre-programmed with specific binary representations of exact values on the manufacturer's high set rating chart curves which represents the maximum power allowed for each selected type of X-ray exposure desired. Once the exposure parameters are selected, the read only memory outputs a unique binary digital signal which is fed into a digital to analog converter which in turn generates an equivalent analog voltage. This analog voltage of maximum allowable power is then compared against the power (kV .times. mA) selected to inhibit further operation if an unsafe condition exists or thereafter cause a proper adjustment to occur while permitting an X-ray exposure for a safe condition, thus allowing the radiologist to utilize the X-ray tube to its fullest capability.

Abstract: To overcome floor clearance problems, a tiltable X-ray table is tilted at an accelerated rate between level and upright positions by a variable ratio positive gear drive. Simultaneously the table is caused to translate at a constant or linear rate by primary drive means mounted directly on the movable table body or chassis. Thus, the ratio of table body translation to tilt is greater at the beginning of table body travel than at later stages of travel. Table body translation is effected by twin ball nut screw shaft assemblies carried by opposite sides of the table body or chassis.

Abstract: A shutter phase lock circuit for a pair of biplane cinecameras having multiframe speeds utilized in a diagnostic X-ray system wherein the cameras are driven by polarized synchronous motors. Each of the cameras have a rotating shutter which is mechanically coupled to a commutator which has a 50% duty cycle and produces a square wave output pulse. The pulses are compared provided that the same camera speed has been selected for both cameras and in the event that two pulses are out of phase by a predetermined phase angle taking into account compensation for mechanical errors, causes an error signal pulse to be produced whose pulse width is a function of the camera speed selected.

Abstract: An X-ray tube protective circuit wherein the selected exposure time and X-ray tube power are compared prior to operation to determine whether or not a condition exists which would exceed the anode rating of the tube and thereafter prevents operation while permitting an X-ray exposure for a safe condition. The subject invention is directed to a means for reducing the number of switch decks normally required in connection with a plurality of resistive voltage divider networks utilized to simulate the tube rating charts for the X-ray tube(s) utilized and comprises a plurality of resistive networks simulating rating chart curves mounted on a plug-in printed circuit board and coupled to a common time select switch deck by means of an isolating diode network.

Abstract: In an X-ray collimator including both "near" and "far" shutter mechanisms, the improvement comprising locating two pairs of independently movable near shutters within an outwardly extending lead cone. The cone is positioned against the X-ray generator tube window and as a result the near shutters are in closer proximity to the focal spot of a rotating anode disc of an X-ray tube than heretofore possible. The cone contains an aperture which defines the maximum size of the primary beam passing through the shutter mechanisms; however, the body of the cone and the closer positioning of the near shutters to the focal spot effectively controls and restricts secondary radiation which is emitted at angles different from the primary beam passing through the collimator.