Abstract: The perception of raster lines on a television monitor is obscured by continuously and cyclically vertically shifting and presenting in successive frames the raster in successive upward positions and then in successive downward positions by incremental amounts, the total maximum vertical shift distance being less than the distance between original horizontal raster lines, thus giving the appearance of blending the information between original horizontal raster lines. Vertical raster deflection is accomplished by cyclically delaying the original, or normal, vertically sync pulses by amounts which incrementally increase to a maximum for producing a vertical frame rise less than the distance between original horizontal raster lines and decrementally decrease to no delay. A photographic camera capable of multiple frame exposure time is used to produce photographs of the video monitor without connections or operational dependence upon the television monitor system.

Abstract: Scanning apparatus is disclosed for use in computerized axial tomography systems. The apparatus includes an assembly rotatable about an axis extending along a central opening defined therein, and means for positioning the body portion to be examined within the central opening so that the axis of assembly rotation is perpendicular to a plane passing through the bodily structures to be examined. A source of penetrating radiation is mounted on the assembly toward one side thereof and provides radiation in the form of a fan beam. Detector means for the radiation are positioned on the assembly opposite the source, enabling detection of radiation which traverses laterally and is not absorbed in the thin body section in which the aforementioned plane resides. Means are provided for rotating the assembly so that the fan beam impinges upon said body portion at a plurality of incident directions.

Abstract: A film-mount structure comprises a relatively stiff face sheet and a backing sheet which can be peeled off to expose an adhesive for receiving, in a removable and replaceable manner, a film strip for retention and viewing. In order to protect the cellulose-based face sheet from partial separation when the radiographic film is peeled from the adhesive surface, a thin mylar sheet is adhesively attached in a substantially permanent manner to the face sheet, and the releasable adhesive is applied directly to the other side of the mylar sheet. In this way, the film mounts' reusable feature is retained while maintaining the integrity of the face sheet.

Abstract: A modular radiation detector array which allows improved spatial resolution and facilitates installation and replacement for repair. Each module includes two detachably assembled portions with one portion including a plurality of spaced plates for collimating radiation. The second portion includes a printed circuit board, a semiconductor diode array chip mounted on the printed circuit board, and a plurality of scintillator crystals mounted on the semiconductor chip with each crystal overlying a diode. Signals from the diodes are applied to signal processing means by a cable which is readily connected to and disconnected from the diode array.

Abstract: A braking system for a mobile medical diagnostic device having forward support wheels operatively associated with proportional electromechanical brakes and a single central steerable wheel assembly at the rear of the device. Means are provided for generating throttle command signals and actual velocity signals and for comparing the two and for applying current to the proportional brakes to a degree which is proportional to the difference in those two signals. When this difference exceeds a predetermined level, a motor brake is further actuated to augment the proportional braking system. Also included is a means for automatically reducing the throttle command signal in proportion to the degree that the steerable wheel assembly is turned from the straight-ahead position.

Abstract: Scanning apparatus is disclosed for use in computerized axial tomography systems. The apparatus includes an assembly rotatable about an axis extending along a central opening defined therein, and means for positioning the body portion to be examined within the central opening so that the axis of assembly rotation is perpendicular to a plane passing through the bodily structures to be examined. A source of penetrating radiation is mounted on the assembly toward one side thereof and provides radiation in the form of a fan beam. Detector means for the radiation are positioned on the assembly opposite the source, enabling detection of radiation which traverses laterally and is not absorbed in the thin body section in which the aforementioned plane resides. Means are provided for rotating the assembly so that the fan beam impinges upon said body portion at a plurality of incident directions.

Abstract: An axial compressor is provided with a cooling air manifold surrounding a portion of the shroud, and means for bleeding air from the compressor to the manifold for selectively flowing it in a modulating manner axially along the outer side of the stator/shroud to cool and shrink it during steady-state operating conditions so as to obtain minimum shroud/rotor clearance conditions. Provision is also made to selectively divert the flow of cooling air from the manifold during transient periods of operation so as to alter the thermal growth or shrink rate of the stator/shroud and result in adequate clearance with the compressor rotor.

Abstract: A continuous 360.degree. impingement baffle is attached directly to a shroud support structure such that the combination provides a low-leakage, high pressure plenum for supplying impingement airflow to the turbine rotor shroud for cooling purposes. After impingement, the air is at a low-pressure and is free to feed the conventional leakage paths with little loss of system efficiency.

Abstract: An axial tomography system is disclosed which includes an assembly rotatable about an axis extending along a central opening defined therein, and means for positioning the body portion to be examined within the central opening so that the axis of assembly rotation is perpendicular to a plane passing through the bodily structures to be examined. A source of penetrating radiation is mounted on the assembly toward one side thereof and provides radiation in the form of a fan beam. Means are provided for rotating the assembly so that the fan beam impinges upon said body portion at a plurality of incident directions. Detector means for the radiation are positioned on the assembly opposite the source, enabling detection of radiation which traverses laterally and is not absorbed in the thin body section in which the aforementioned plane resides.

Abstract: Movement control of an L/U arm combination of a medical diagnostic apparatus is maintained by the use of a single handle mounted on the patient table and provision is made for temporarily removing the handle for sterilization and for easily replacing the handle for subsequent use. The handle can be operated by a single hand of an operator to selectively rotate either or both of the L/U elements in either direction on their axes or to move the patient table, longitudinally or laterally, to a desired position. An enabling lever is also provided on the handle such that no movement of the components can occur until the enabling lever has been depressed as by the operators grasping the control handle.

Abstract: The cooling air flowpath for a turbomachine includes a plurality of valves placed in mutually parallel relationship to collectively provide for the modulation of the cooling airflow. Minimum flow requirements are assured while economizing on air to increase efficiency. Any single valve passes only a small portion of the total air so that a valve failure does not appreciably reduce the overall cooling function.

Abstract: A plurality of blocker door vanes are disposed in the bypass duct to selectively close off the bypass flow and increase the flow and pressure of the air flowing into the compressor. In this way, the compressor inlet pressure can be increased sufficiently to allow air starts without starter torque assist. The vanes may also be closed down during ground idle to reduce the thrust and increase the compressor bleed pressure and both the pressure and the temperature of the air to the combustor. Provision is made for the controlling of the blocker door vanes as a function of core speed.

Abstract: A multicell x-ray detector includes a chamber for confining a gas that produces electron-ion pairs incidental to absorbing radiation. A unitary multicell electrode assembly is mounted within the chamber. The assembly includes a plurality of electrode plates secured in first and second insulating members. A method is provided for bonding the electrode plates into the insulating members with a uniform distribution of adhesive which does not allow the adhesive to bridge between adjacent plates. The opposed ends of the plurality of electrode plates are inserted into grooves of the members. A relatively non-viscous liquid adhesive is brought into contact with one edge of each of the grooves of both members by a cellular applicator until the adhesive propagates by capillary action along the entire length of each groove.

Abstract: An improvement is disclosed which is applicable to the method for constructing a two-dimensional representation of an object slice lying in a quasi-plane by positioning a radiation source providing a fan beam incident on the object, positioning detector means opposite the source and aligned therewith and lying in said quasi-plane for detecting radiation in said quasi-plane not absorbed or scattered by the object; effecting relative rotation between the object and the source-detector combination about an axis of rotation such that the source and detector means remain in the quasi-plane; effecting measuring projections from the source at a plurality of angular positions during the rotation to obtain a multiplicity of measured data readings from the detectors at each said projection; and reconstructing a two-dimensional representation of the object slice by convolving the data without reordering same, and scaling and back projecting same.

Abstract: A mobile medical diagnostic device having a mobility chassis with two supporting wheels and a central steerable drive wheel. The device has an electrical power steering system controlled by two synchronized handles operable by wrist action of an operator walking behind the device. The handles include a rotatable grip for controlling the velocity of the device. Advancing the grip actuates the throttle to the drive wheel and retarding the grip actuates a proportional electromechanical braking system. The device includes a proximity detector system which uses ultrasonic transducers to determine when an obstacle is within close proximity to the device, and automatically actuates the brake system. A window signal is established on the basis of both a preselected distance from the device within which it is desirable to apply the brakes, and a delay function which is determined by the distance of the front portion of the device from the transducer.

Abstract: An improvement is disclosed which is applicable to the method for constructing a two-dimensional representation of an object slice lying in a quasi-plane by positioning a radiation source providing a fan beam incident on the object, positioning detector means opposite the source and aligned therewith and lying in said quasi-plane for detecting radiation in said quasi-plane not absorbed or scattered by the object; effecting relative rotation between the object and the source-detector combination about an axis of rotation such that the source and detector means remain in the quasi-plane; effecting measuring projections from the source at a plurality of angular positions during the rotation to obtain a multiplicity of measured data readings from the detectors at each said projection; and reconstructing a two-dimensional representation of the object slice by convolving the data without reordering same, and scaling and back projecting same.

Abstract: A bypass duct outer cowl includes a fixed cascade disposed between axially spaced fixed cowl portions and a translatable cowl sleeve and blocker doors movably disposed on the respective radially outer and inner sides of the cascade. Actuation and linkage structure located entirely within the outer cowl provides for selectively moving the cowl sleeve rearwardly and rotating the blocker doors to a position across the bypass duct to cause the fan airflow to pass through the cascade in a thrust-reversing manner.

Abstract: The angle of the variable blocker door vanes in the bypass duct of a turbofan engine is varied in response to the angle of the variable compressor vanes of the engine. A cam and linkage assembly interconnect the blocker doors with the actuation system of the variable stator vanes such that as the angle of the stator vanes is modulated through a first predetermined range, the angle of the blocker doors is modulated through a second predetermined range.

Abstract: A multicell x-ray radiation detector includes a chamber for confining a gas that produces electron-ion pairs incidental to absorbing radiation. The chamber is formed by a channel having a bottom and sidewalls, one of the side walls having a window for admitting radiation to the chamber. A multicell unitary electrode assembly is mounted within the chamber. An upper compressed elastic member is interposed between the electrode assembly and the chamber and, similarly, a rear compressed elastic member is interposed between the assembly and the sidewall opposite the window of the chamber. The compressed elastic members interposed between the electrode assembly and the chamber isolate the electrode assembly from any mechanical vibration and thermal distortion of the chamber while maintaining a precise position of the electrode assembly to the chamber window.

Abstract: An axial tomography system is disclosed which includes an assembly rotatable about an axis extending along a central opening defined therein, and means for positioning the body portion to be examined within the central opening so that the axis of assembly rotation is perpendicular to a plane passing through the bodily structures to be examined. A source of penetrating radiation is mounted on the assembly toward one side thereof and provides radiation in the form of a fan beam. Means are provided for rotating the assembly so that the fan beam impinges upon said body portion at a plurality of incident directions. Detector means for the radiation are positioned on the assembly opposite the source, enabling detection of radiation which traverses laterally and is not absorbed in the thin body section in which the aforementioned plane resides.