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X-ray focal spot movement compensation system

An X-ray and focal spot technology, applied in the field of position devices, can solve problems such as focal spot drift and position drift

Inactive Publication Date: 2004-04-07
ANLOGIC CORP (US)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the rotating disc heats up, thermal expansion will cause the focal spot to shift (typically 0.1 to 0.3 mm), thereby making the passage of the X-ray radiation beam already limited by the collimator slit relative to the collimator and Detector position drift

Method used

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  • X-ray focal spot movement compensation system
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  • X-ray focal spot movement compensation system

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Embodiment Construction

[0029] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0030] figure 1 A modified third generation CT scanning apparatus 12 constructed in accordance with the present invention is shown. Apparatus 12 comprises a support structure, the latter comprises the trolley 14 that supports the gantry assembly 16 that has a disk type or ring type, support frame 18 usefulness, and a mode that can rotate around the Z-axis that reference numeral 28 supports Rotating disc 20 on support frame 18 . The support frame 18 is mounted on both sides of the trolley 14 in a pivotable manner, so that the positioning position of the support frame 18 relative to the pivot 22 can be adjusted. A suitable drive system for supporting and rotating the disc 20, referenced 24, comprising drive rollers and idler rollers is shown. A more detailed description can be found in U.S. Patent Application No. 08 / 19783 (filed by Gilbert W. McKenna on...

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PUM

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Abstract

An apparatus for compensating for drift of the focal spot of an X-ray radiation source used in a tomography system is disclosed so as to maintain a primary collimated beam of radiation emanating from the focal spot aligned with target detectors of the tomography system. A second collimated beam of radiation is produced from the same focal spot and directed along a different axis from the first beam. An array of detectors track the movement of the second collimated beam and produce signals which are used to reposition the collimator used to collimate the primary beam so as to maintain the primary beam substantially aligned with the target detectors.

Description

technical field [0001] This invention relates to tomography systems, and in particular to methods that can be used to maintain the alignment of a collimated radiation beam in a tomography system to (a) compensate for drift of the focal spot along the Z axis, (b) A device that stabilizes the position of a radiation beam over a detector in a tomography system. Background technique [0002] In recent years, computerized tomography (CT) systems have been used to generate tomographic images of thin cross-sectional layers through objects, which are particularly useful in the medical diagnostic field. Third-generation CT scanners consist of a disc or drum rotatably supported on a gantry-like support frame and supporting an array of X-ray sources and X-ray detectors. The radiation source can generally provide periodic pulses of X-rays or a continuous wave (CW) of X-rays. X-rays are usually radiated from a point called the "focal spot". The collimator can be configured to control ...

Claims

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Application Information

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IPC IPC(8): A61B6/03A61B6/06G21K1/04H05G1/26H05G1/60
CPCG21K1/04A61B6/4021A61B6/032A61B6/06A61B6/4488H05G1/60H05G1/26
Inventor 约翰·多布斯鲁温·戴伊驰
Owner ANLOGIC CORP (US)