Method of recording X-ray images and imaging chamber suited therefor
AssigneeAgfa-Gevaert
InventorsArnold A. Willem, Johan M. Broekaert, Jean M. De Gueldre
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Abstract
An apparatus and method is described for producing an electric field distribution in an imaging chamber corresponding with that of spherical caps. By adequately choosing the distance between annular ring electrodes provided on or in the electrodes of the imaging chamber, use may be made of a high DC-voltage generator of the cascade type so that the voltage applied to each annular electrode is an integer of a basic voltage. Also the voltage over the gap may so be generated. As a consequence, only one high DC-voltage is necessary for generating all the voltages of the whole system.
Claims7
Ionographic imaging apparatus comprising an ionographic imaging chamber having flat electrodes each having a series of spaced incremental zones of relatively high conductivity, a DC-voltage source connected to said electrodes to maintain an electrostatic field therebetween, and a common voltage supply circuit which provides a series of voltage steps of magnitudes having a common factor and which applies voltages having that common factor to the incremental zones of the electrodes, the distribution of such incremental zones being such that the potential variations along the electrode surfaces approximate to those of spherical cap electrodes providing a concentric spheric equipotential in the imaging gap between the electrodes, the DC-voltage from said DC-voltage source creating the electric field over the inter-electrode gap being a multiple of said common factor and derived from the same voltage supply circuit as the voltages applied to the incremental electrode zones.
Ionographic imaging apparatus comprising an ionographic imaging chamber having cylindrical electrodes each having a series of spaced incremental zones of relatively high conductivity, a DC-voltage source connected to said electrodes to maintain an electrostatic field therebetween, and a common voltage supply circuit which provides a series of voltage steps of magnitudes having a common factor and which applies voltages having that common factor to the incremental zones of the electrodes, the distribution of such incremental zones being such that the potential variations along the electrode surfaces approximate to those of spherical cap electrodes providing a concentric spheric equipotential in the imaging gap between the electrodes, the DC-voltage from said DC-voltage source creating the electric field over the inter-electrode gap being a multiple of said common factor and derived from the same voltage supply circuit as the voltages applied to the incremental electrode zones.
Dependencies are inferred from the claim text.