X-ray apparatus having an x-ray tube with vario-focus

Details X-ray apparatus having an x-ray tube with vario-focus X-ray apparatus having an x-ray tube with vario-focus

1997-09-29

1998-10-13

Wong, Don

X-ray or gamma ray systems or devices

Source

Electron tube

378138, 378119, 378121, H05G 160

Patent

active

058223959

ABSTRACT:
An x-ray tube with vario-focus has an evacuated housing in which are arranged, rigidly connected thereto, an electron-emitting cathode and an anode dish which is struck by the electron beam, accelerated with an electrical field. An electromagnetic system for deflecting and focusing the electron beam is provided, and has a number of current-permeated coil elements. A lateral x-ray beam exit window is provided in the housing for the x-rays, which emerge at substantially a right angle relative to the longitudinal middle axis. The x-rays are picked up by an image receiver following a subject table. At least the anode dish is tiltable relative to the connecting axis to the image receiver, and the electromagnetic system at least partially surrounds a cathode-side neck section of the housing, and generates a quadrupole field for modifying the electron beam cross-section, corresponding to the tilt angle.

REFERENCES:
patent: 5197088 (1993-03-01), Vincent et al.

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