| 摘要 |
The invention relates to a medical imaging device using X or gamma ionizing radiation. It comprises a source (S) of radiation in a divergent beam, and a longitudinal slit (F) delivering a sheet-form beam in a plane containing the slit (F). A detection module (1) is provided, which comprises a drift chamber (12) and a multiwire chamber which are filled with a gas. The chambers comprise, in a direction orthogonal to the plane containing the slit (F), the drift space (12) for the electrons, comprising a cathode electrode (11), a converter (121), a proportional multiplier anode (13) for generating multiplied electrons and corresponding ions, and a second cathode electrode (14), placed in the vicinity of the multiplier anode (13). The multiplier anode (13) and the second cathode electrode (14) consist of conductor elements extending in two parallel planes, along substantially orthogonal directions, in order to permit two-dimensional localization of the electrons in this plane.
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