Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

X-ray attenuation correction method, image generating apparatus, x-ray ct apparatus, and image generating method

一种产生装置、衰减校正的技术，应用在X射线CT装置,图像产生领域，能够解决降低断层扫描图像等问题，达到散射X射线校正精确、减轻X射线衰减的效果

Inactive Publication Date: 2007-09-26
GE MEDICAL SYST GLOBAL TECH CO LLC
View PDF1 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Artifacts can be a cause of degrading the quality of tomographic images, so this is by no means preferred

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • X-ray attenuation correction method, image generating apparatus, x-ray ct apparatus, and image generating method
  • X-ray attenuation correction method, image generating apparatus, x-ray ct apparatus, and image generating method
  • X-ray attenuation correction method, image generating apparatus, x-ray ct apparatus, and image generating method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0061] An overview of an X-ray CT apparatus according to a first preferred embodiment of the present invention will now be described. Referring now to FIG. 1 , there is shown a schematic block diagram of an X-ray CT apparatus. As shown in FIG. 1 , the device includes a scanning frame 10 , an operation console 6 and an imaging table 4 .

[0062] The gantry 10 includes an X-ray tube 20 . Not shown in the figure but the X-ray emitted from the X-ray tube 20 as the X-ray generator is passed through a fan-shaped collimator 22 having a certain thickness, for example, to form an X-ray cone beam, and will be transmitted to the surface. An X-ray detector 24 placed against the X-ray tube 20 .

[0063] The X-ray detector 24 has a plurality of scintillator arrays arranged in a matrix in the developing direction of the fan beam X-rays. The X-ray detector 24 is a multi-channel detector with multiple scintillators arranged in a matrix structure with a certain width.

[0064] The X-ray det...

no. 2 example

[0094] In the above-mentioned first preferred embodiment, a differential operation is performed on the projection information in the direction of the channel to extract boundary information of X-ray absorptivity changes. In this preferred embodiment, an embodiment will be described in which differential operation is performed on the projection information in the direction corresponding to the row direction of the X-ray detector to extract boundary information in the row direction, which is the row direction of the X-ray detector. The rotation direction is perpendicular to the width direction (hereinafter simply referred to as the row direction). In this embodiment, the boundary information extracting means 74 and the X-ray attenuation correcting means 75 will be described in more detail, and the description of other arrangements similar to the aforementioned preferred embodiments will be omitted.

[0095] In this embodiment, the boundary information extracting means 74 has a d...

no. 3 example

[0107] In order to extract the boundary information of X-ray absorptivity changes, in the above-mentioned first preferred embodiment, the differential operation is performed on the projection information in the channel direction, while in the above-mentioned second preferred embodiment, the present invention performs differential operation in the row direction . In this embodiment, an example will be described in which differential operations are performed on projection information in both the channel direction and the row direction to extract boundary information where X-ray absorptivity changes. In this preferred embodiment, the boundary information extraction means 74 and the X-ray attenuation correction means 75 will be described in more detail, and other arrangements similar to the first embodiment will not be described.

[0108]In this embodiment, the boundary information extracting means 74 has a difference means for performing differential operations on the projection ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides an X-ray attenuation correction method, image generating apparatus, X-ray CT apparatus, and image generating method for correcting for the attenuation of X-ray beam at the boundary where the X-ray absorption rate of a subject is changing. Boundary information comprised of the boundary position where the X-ray absorption rate is changing and the magnitude of change is extracted from the projection information of the subject, then the boundary information is used to multiply the amount of scattered X-ray by the amount corresponding to the magnitude of change at the boundary position, to correct for the attenuation of X-ray at the boundary position. The attenuation of X-ray at the boundary position may be corrected for along with the scattered X-ray correction of the projection information, allowing alleviating artifacts developed in a tomographic image.

Description

technical field [0001] The present invention relates to an X-ray attenuation correction method for correcting attenuation of an X-ray beam emitted to a subject, an image generating device, an X-ray CT device, and an image generating method. Background technique [0002] X-ray CT apparatuses are now widely used, and image quality requirements for X-ray tomographic image information obtained by the X-ray CT apparatuses are continuously becoming finer. There are various methods for improving the image quality of X-ray CT images including, for example, correcting scattered X-rays generated within the object. [0003] In the method described above, the theoretically or experimentally determined amount of scattered X-rays is eliminated from the projection information of the object. The projection information on which the image reconstruction is based is configured such that it consists only of the emitted X-ray beams. [0004] The amount of scattered X-rays from the object incre...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/00G01N23/00G06T5/00
CPCG06T11/005A61B6/583A61B6/03
Inventor 贯井正健
Owner GE MEDICAL SYST GLOBAL TECH CO LLC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com