X-ray or gamma ray systems or devices – Beam control – Scanner
Patent
1995-04-18
1996-05-28
Porta, David P.
X-ray or gamma ray systems or devices
Beam control
Scanner
2503851, G01T 1185
Patent
active
055219560
ABSTRACT:
A medical imaging device using X- or gamma ionizing radiation, provided with a source of radiation in a divergent beam diaphragmed by a slit and a module for detecting a beam transmitted by a body to be observed, illuminated by the beam. The detection module comprises a drift chamber and a multiwire chamber which are filled with a gas, these chambers comprising, in a direction orthogonal to the plane containing the slit and the illumination beam, a drift space for the electrons, an electron proportional multiplier grid for generating multiplied electrons and corresponding ions and a second cathode electrode making it possible to count the multiplied electrons by means of the corresponding ions for a plurality of directions of the sheet-form illumination beam.
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Nuclear Instruments & Methods 156 (1978) 1-17: "Applications of Proportional Chambers to Some Problems in Medicine and Biology", by G. Charpak.
European Organization for Nuclear Research, "An Interesting Fall-Out of High-Energy Physics Techniques: The Imaging of X-rays at Various Energies for Biomedical Applications", by G. Charpak and F. Sauli, CERN, Geneva, Switzerland Apr. 1976.
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