United States Patent
US Patent 5959302: High resolution radiographic imaging device
US 5959302 · granted 1999-09-28
Abstract
A high resolution radiographic imaging device for medical or industrial radiography includes at least one ionizing particles detector equipped with at least one gas chamber provided with a window for the lateral or frontal inlet of the illumination beam. A first, a second and a third flat electrode are placed in parallel with one another in order to form a conversion space and a amplification space with the distance separating the second and third electrodes being less than 200 .mu.m and the amplitude ratio of the electrical fields created between the second and third electrodes and the first and second electrodes being greater than 10.
| Patent Number | 5959302 |
|---|---|
| Title | High resolution radiographic imaging device |
| Filed | 1997-05-27 |
| Granted | 1999-09-28 |
| Inventor(s) | Charpak; Georges |
| Number of Claims | 30 |
Abstract
A high resolution radiographic imaging device for medical or industrial radiography includes at least one ionizing particles detector equipped with at least one gas chamber provided with a window for the lateral or frontal inlet of the illumination beam. A first, a second and a third flat electrode are placed in parallel with one another in order to form a conversion space and a amplification space with the distance separating the second and third electrodes being less than 200 .mu.m and the amplitude ratio of the electrical fields created between the second and third electrodes and the first and second electrodes being greater than 10.
Claim 1
A high resolution radiographic imaging device using ionizing radiation comprising a source of ionizing radiation in the form of a divergent beam, a longitudinal slot forming adiaphragm adapted to deliver a flat illumination beam, substantially distributed in a plane containing the longitudinal slot, and means for detecting a beam transmitted through a subject to be observed, illuminated by the flat illumination beam, whereinsaid detecting means comprise at least one ionizing particles detector comprising at least: one gas chamber provided with an inlet window for said illumination beam, and in this gas chamber, a first, a second and a third flat electrode, each flat electrode being placed parallel with one another in order to form a conversion space for the conversion of the illumination beam into electrons and an amplification space for theamplification by multiplication of these electrons, said inlet window being placed at the level of the conversion space in order to ensure the inlet of said illumination beam into said conversion space, said amplification space having an amplificationlength which is formed by the distance separating said second and said third electrodes, of less
Claims
30 totalA high resolution radiographic imaging device using ionizing radiation comprising a source of ionizing radiation in the form of a divergent beam, a longitudinal slot forming adiaphragm adapted to deliver a flat illumination beam, substantially distributed in a plane containing the longitudinal slot, and means for detecting a beam transmitted through a subject to be observed, illuminated by the flat illumination beam, whereinsaid detecting means comprise at least one ionizing particles detector comprising at least: one gas chamber provided with an inlet window for said illumination beam, and in this gas chamber, a first, a second and a third flat electrode, each flat electrode being placed parallel with one another in order to form a conversion space for the conversion of the illumination beam into electrons and an amplification space for theamplification by multiplication of these electrons, said inlet window being placed at the level of the conversion space in order to ensure the inlet of said illumination beam into said conversion space, said amplification space having an amplificationlength which is formed by the distance separating said second and said third electrodes, of less