X-ray or gamma ray systems or devices – Beam control – Antiscatter grid
Patent
1986-04-29
1987-08-18
Church, Craig E.
X-ray or gamma ray systems or devices
Beam control
Antiscatter grid
378 7, 378 62, 378 99, 378145, 378155, 378147, 358111, G21K 100
Patent
active
046882421
ABSTRACT:
An X-ray imaging system has an X-ray source, an X-ray image detection section, an X-ray mask member, a drive unit, a memory, a calculating section, and an image output unit. An X-ray image is detected by the X-ray image detection section. The X-ray mask member has X-ray shielding regions, distributed in a predetermined pattern, which locally shield the X-ray. The mask member is driven by the drive unit so that it is inserted in or removed from an X-ray radiation field between the X-ray image detection section and the X-ray source, and is sequentially displaced to predetermined positions in the radiation field. The calculating section calculates scattered X-ray intensity distribution data based on a plurality of transmission X-ray data obtained by irradiating an object with X-rays with the mask member located at different positions in the radiation field, and transmission X-ray data obtained by irradiating the object with X-rays with the mask member located outside this field. The calculating section then calculates X-ray image data from the scattered X-ray intensity distribution data and transmission X-ray data obtained with the mask member located outside the radiation field.
REFERENCES:
patent: 4549307 (1985-10-01), Macovski
Church Craig E.
Freeman John C.
Kabushiki Kaisha Toshiba
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