Metal artifact correcting method of cone-beam CT (computed tomography) system

A technology of metal artifacts and correction methods, applied in the field of medical image processing, can solve the problems of increasing radiation dose of patients and prolonged scanning time of patients

Active Publication Date: 2013-04-03
SHENZHEN INST OF ADVANCED TECH
View PDF4 Cites 36 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need to generate two CT image data sets at different energies, it is necessary to repeat the scan twice, which incr

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
  • Metal artifact correcting method of cone-beam CT (computed tomography) system
  • Metal artifact correcting method of cone-beam CT (computed tomography) system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] see figure 1 , a flow chart of the steps of the metal artifact correction method for the cone beam CT system provided by the embodiment of the present invention, including the following steps:

[0032] Step S10: Separate the metal projection image M(x, y) from the original orthographic projection image f(x, y).

[0033] see figure 2 , is a flow chart of the steps for separating the metal projection image M(x, y) from the original orthographic projection image f(x, y) provided by the embodiment of the present invention, step S10 is specifically:

[0034] Step S11: Define the initial threshold I 0 . Among them, the initial threshold is I 0 =(I max +I min ) / 2, in the above formula, I max is the maximum gray value of the pixel in the original orthographic projection image f(x, y), I min is the minimum gray value in the original orthographic projection image f(x, y).

[0035] Step S12: Based on the initial threshold I 0 , divide the original orthographic projectio...

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 invention relates to a metal artifact correcting method of a cone-beam CT (computed tomography) system. The metal artifact correcting method of the cone-beam CT system comprises the steps of separating a metal projection image M (x, y) from an original orthographic projection image f(x, y), reconstructing the metal projection image M (x, y) to obtain a CT reconstruction image XMetal of the metal part, reducing the metal projection image M (x, y) of the original orthographic projection image f(x, y) to obtain a projection image fres(x, y) without the metal part, reconstructing the projection image fres(x, y) without the metal part to obtain a CT (computed tomography) image Xres without the metal part, and adding a CT (computed tomography) image Xmetal of the metal part with the CT (computed tomography) image Xres without the metal part to obtain a final CT (computed tomography) reconstruction image Xcorrection after the correction of a metal artifact. Coordinates are not changed in the metal artifact correcting method, so that the image space resolution is not lost, and the image quality is enhanced.

Description

technical field [0001] The invention relates to the field of medical image processing, in particular to a method for correcting metal artifacts of a cone-beam CT system. Background technique [0002] Cone beam CT (Computed Tomography) has developed rapidly in the fields of oral disease diagnosis, human local organ imaging, and industrial inspection due to its advantages of fast scanning speed, high ray utilization rate, low dose, and isotropic spatial resolution. However, the existence of substances with high attenuation coefficients in CT imaging (such as metal plastic devices in the human body, biopsy agents that patients must carry, metals in chips, etc.) will lead to serious metal artifacts, which appear as streaky bright lines, dark bands or Shadows seriously damage the authenticity of CT images, which greatly limits its high-precision detection in the medical and industrial fields. Therefore it is necessary to remove or minimize metal artifacts. [0003] Chinese Pate...

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
IPC IPC(8): G06T5/50
Inventor 胡战利郑海荣夏丹
Owner SHENZHEN INST OF ADVANCED TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap