Emanuel V Polizzi

US Patent:

43564003, Oct 26, 1982

Filed:

Aug 4, 1980

Appl. No.:

6/175162

Inventors:

Emanuel V. Polizzi - Hartland WI
David G. Lieder - Waukesha WI

Assignee:

General Electric Company - Schenectady NY

International Classification:

G03B 4116

US Classification:

378138

Abstract:

In x-ray apparatus where the central ray of an x-ray beam must be made perpendicular to the planes of one or more image receptors, a central ray locator is coupled to the beam output port of an x-ray tube casing and the central ray is indicated when a luminescent spot occurs at the intersection point of cross hairs on a phosphor screen. A laser device then replaces the locator. Its beam simulates the central ray and coincides with it and provides a visual indication of it. The laser beam enables determining if the tube casing is moving in a straight vertical line by observing the movements of the laser beam light spot while it is projected on a plane surface. Procedures are disclosed for establishing the simulated central ray in perpendicularity with receptor planes.

US Patent:

45788065, Mar 25, 1986

Filed:

Dec 15, 1983

Appl. No.:

6/561941

Inventors:

Joseph J. Grass - Brookfield WI
Marvin P. Glyzewski - Waukesha WI
Emanuel V. Polizzi - Waukesha WI

Assignee:

General Electric Company - Schenectady NY

International Classification:

A61B 608

US Classification:

378162

Abstract:

The isocenters of two independent frontal and lateral viewing X-ray systems are made coincident using an X-ray permeable target frame that has congruent crosshairs defined by X-ray impermeable lines on opposite side walls. A small steel ball is located in the frame between side walls on a line running from the intersection of one set of crosshairs to the other. A television display of the X-ray image of the ball resting on the patient supporting table top with the frame leveled and of the crosshairs with the frontal system having the central ray of its X-ray beam vertical and then horizontal and with X-ray impermeable crosshairs on the image receptor permits shifting the frame until the crosshairs on it and on the receptor are coincident with the ball and the isocenter in vertical and horizontal orientations. The procedure for establishing the isocenter of the lateral system is comparable. The target frame is also mounted for rotating relative to protractors to measure and calibrate the angular orientations of the systems.