Detection apparatus for X-ray tomography
AssigneeCommissariat a l'Energie Atomique
InventorRobert Allemand
Life of this patent
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Abstract
In a device comprising one or a number of X-ray beams of suitable shape and at least one cell for detecting X-rays which have passed through the organ to be analyzed, the detection cells are ionization chambers comprising two parallel electrodes separated by a radiation-detecting medium for converting the X-rays to electron-ion pairs. The electrodes are connected to two terminals of a voltage source and the detection cells are associated with means for measuring the charge collected during a predetermined period of time under the influence of the X-rays.
Claims9
Detection apparatus for use with X-ray tomography apparatus comprising at least one X-ray source adapted to emit X-ray beams to pass through an organ to be analyzed and to thereupon be intercepted by said detection apparatus which comprises multicellular ionization chambers constituted by a single comb-type anode formed by a substantially cylindrical first plate p and a plurality of flat plates P.sub.i at right angles to said plate P and a plurality of cathodes C.sub.i, each being formed by a plate which is parallel to one of said plates P.sub.i, each of said chambers comprising two substantially parallel anode and cathode electrodes separated by a radiation-detecting medium adapted to convert the incident X-rays to electron-ion pairs, connected to said electrodes, and means connected to said electrodes for measuring the charge collected during a predetermined time interval under the influence of the incident X-rays.
Detection apparatus for use with X-ray tomography apparatus comprising at least one X-ray source adapted to emit X-ray beams to pass through an organ to be analyzed and to thereupon be intercepted by said detection apparatus which comprises multicellular ionization chambers constituted by a series of anode plates positioned parallel to each other and parallel to the direction of propagation of the X-rays, a grid positioned parallel to said anode plate and being brought to a negative potential -.vertline.V.sub.1 .vertline., and a cathode plate positioned parallel to said anode plates and so that said grid is between said cathode plate and said anode plates, said cathode plate being brought to a negative potential .vertline.V.sub.2 .vertline.>.vertline.V.sub.1 .vertline., a radiation detecting medium adapted to convert the incident X-rays to electron-ion pairs, and means connected to said anode plates for measuring the charges collected during a predetermined time interval under the influence of the incident X-rays.
Dependencies are inferred from the claim text.