H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/26
H01J 35/04 (2006.01) G21K 1/02 (2006.01) H01J 35/08 (2006.01) H01J 35/14 (2006.01) H05G 2/00 (2006.01)
Patent
CA 1271511
ABSTRACT OF THE DISCLOSURE An X-ray tube has a wide area cold cathode with a graphite felt surface which faces and is spaced from a wide area anode of high atomic number material. A grid is interposed between the two and the anode, grid and cathode are enclosed in an envelope which is filled with gas at a low pressure. The graphite surface of the cath- ode is connected to a relatively high negative potential so that electrons are emitted from the entire surface area and impinge upon the anode, after triggering by the grid. The distribution of the energy of photons emitted from the anode is relatively constant during the ignition period of the tube. An extremely wide area X-ray source is then defined having constant bremstrahlung content which enables good gray scale measurements when employing the X-ray source. A pinhole collimator disposed exter- nally of the tube ensures collimation of the output X-ray field. A polarized electron beam is used as a collimator in place of the pinhole collimator, in a preferred embod- iment, to produce a collimated, wide area X-ray flux. The cathode, grid and anode structure can have any de- sired size or shape. The X-ray source can be flat and sized to illuminate a chest X-ray film or can be arcuate to at least partly wrap around the subject to be exposed to the X-rays. Arcuate X-ray sources can be linked end to end and scanned sequentially to define an X-ray source for use in Computer Axial Tomography (CAT) scan type ap- plications. The same computer algorithm used for conven- tional CAT scan analysis can be used.
509489
Birnbach Curtis
Tanner Jay
Marks & Clerk
Quantum Diagnostics Ltd.
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