Annular anode x-ray computed tomography apparatus with a single magnet system for guiding and deflecting the electron beam

US5504791A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Erich Hell · Erlangen, DE
• Manfred Fuchs · Nuremberg, DE

Key dates

• Filing date: Jan 24, 1995
• Grant date: Apr 2, 1996
• Expiry date: Jan 24, 2015

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J35/30
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

In an electronic x-ray computed tomography apparatus that enables a scanning of approximately 360.degree., the electron beam is guided in an annularly fashioned magnet arrangement that has a U-shaped cross section. The U enables the guidance of the electron beam to the annular anode and enables the emergence of the x-radiation. The magnet arrangement is composed of a number of side-by-side U-shaped magnet elements arranged to form an annulus with a coil for excitation of the magnet element respectively arranged on the cross bar of each U. A single magnetic arrangement is thus used to generate both the electron beam guidance field and, by means of a sudden polarity reversal of a magnet element disposed at a desired deflection location, the deflection field.