| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiple radiation source X-ray CT system in which a sharp diagnostic image is obtained by reducing the occurrence of secondary X-rays or scattered light to become a cause of noise. SOLUTION: In the multiple radiation source X-ray CT system provided with a plurality of X-ray generators arranged densely and fixedly and an X-ray detector 60, each X-ray generator is equipped with a cathode 44, an anode 33 for generating an X-ray by making incident an electron beam emitted from the cathode, a grid 45 as a gate array located between the cathode and the anode for allowing or limiting passing of the electron beam from the cathode to the anode by controlling an applied voltage, an annular window member 51 mounted onto a vacuum container via seal structures 51b and 55 to close an opening of the vacuum container along with a circumference with an axial center its center over the full circumference of 360°, having thickness with which a strength immune to vacuum pressure is guaranteed, and composed of a material of a low radiation absorption factor with which passing of X-rays is allowed in the state of a little attenuation, and shields 24 and 53 covering overall the vacuum container and the window member except for an X-ray emission part of the window member. COPYRIGHT: (C)2004,JPO
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