X-ray CT device

A technology of X-rays and radiation sources, applied in the field of multi-slice X-ray CT devices, which can solve problems such as insufficient data

Inactive Publication Date: 2004-07-28
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practice, part of the target internal organ is separated from the scan range, resulting in insufficient data and possible rescanning

Method used

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Examples

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Embodiment Construction

[0027] Referring to the drawings, a first embodiment of the X-ray CT apparatus of the present invention will be described. There are many types of X-ray CT apparatuses, such as a rotary / rotary type in which an X-ray tube and an X-ray detector rotate around a patient as a unit, and a fixed / rotary type in which a plurality of detection elements are arranged in a ring and the X-ray tube rotates around a patient. Rotary type. The present invention can be applied to every type of X-ray CT apparatus. Hereinafter, a rotation / rotation type X-ray CT apparatus is explained as an example. Mechanisms for converting incident X-rays into charges are mainly classified into direct conversion types and indirect conversion types. In the direct conversion type, X-rays are converted into optical signals by a fluorescent substance such as a scintillator, and the optical signals are converted into charges. In the indirect conversion type, a photoconductive phenomenon is used in which pairs of el...

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Abstract

An X-ray CT apparatus, as one example, includes at least one X-ray irradiation source configured to irradiate an X-ray to a volume of interest, at least one X-ray detector including a plurality of detection element segments configured to detect the X-ray penetrated through the volume of interest, at least one collimator configured to create an opening that is movable in at least one of a slice direction and a channel direction, at least one image processing part configured to extract a portion of the volume data, a controller configured to set the opening of the at least one collimator to a second opening size according to a cylinder-like second scanning range that is set to limit the volume of interest and configured to perform a second scan, and at least one reconstruction part configured to reconstruct image data based on data collected by the second scan.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims the benefit of priority from prior Japanese Patent Application No. 2002-347795 filed on November 29, 2002, the entire contents of which are incorporated herein by reference. technical field [0003] The invention relates to a multi-slice X-ray CT device. Background technique [0004] An X-ray CT apparatus is known that irradiates a patient with X-rays, and reconstructs image data from the transmission data. Using a multi-slice X-ray CT apparatus, it is possible to simultaneously collect two or Multiple slices of data. By using multi-slice scanning (also called cone beam scanning) together with helical scanning, data of a large scanning range can be collected in a short time, and multi-slice X-ray CT apparatuses become popular. [0005] Using multi-slice scanning with helical scanning, one of the important topics is X-ray dose reduction. For example, Japanese Patent Publicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03A61B6/06
CPCA61B6/466A61B6/488A61B6/4085A61B6/06A61B6/503A61B6/027A61B6/032
Inventor 奥村美和东木裕介太田高正
Owner KK TOSHIBA
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