X-ray or gamma ray systems or devices – Auxiliary data acquisition or recording
Patent
1983-12-15
1986-03-25
Church, Craig E.
X-ray or gamma ray systems or devices
Auxiliary data acquisition or recording
378205, A61B 608
Patent
active
045788065
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.
REFERENCES:
patent: 2581431 (1952-01-01), Nelson
patent: 3374350 (1968-03-01), Mills
patent: 4053782 (1977-10-01), Grass
patent: 4061924 (1977-12-01), Jacoby
Glyzewski Marvin P.
Grass Joseph J.
Polizzi Emanuel V.
Church Craig E.
General Electric Company
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