Unlock instant, AI-driven research and patent intelligence for your innovation.

Calibration method and system for geometric correction phantom

A technology of geometric correction and correction method, applied in the processing of 3D images, image data processing, instruments, etc., can solve problems such as affecting the accuracy of geometric parameters and affecting the spatial coordinate values ​​of phantoms

Active Publication Date: 2018-02-23
GUANGZHOU HUARUI TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, correcting the machining accuracy of the phantom will still affect the spatial coordinate values ​​of the marked points on the phantom, thereby affecting the accuracy of geometric parameters

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
  • Calibration method and system for geometric correction phantom
  • Calibration method and system for geometric correction phantom
  • Calibration method and system for geometric correction phantom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] see figure 1 As shown in the figure, it is a flow chart of realizing the correction method of the geometric correction phantom in Embodiment 1 of the present invention. Such as figure 1 As shown, the correction method of the geometric correction phantom in the present embodiment includes the following steps:

[0036] Step S101: scanning the prefabricated geometric correction phantom by the spiral CT system, and calculating the spatial coordinate values ​​of the preset marker points on the geometric correction phantom;

[0037] Here, the geometric correction phantom can be manually made, and the geometric correction phantom can be designed and produced according to a selected geometric correction method;

[0038] Specifically, firstly, the three-dimensional image of the geometric correction phantom is reconstructed by scanning the prefabricated geometric correction phantom through the spiral CT system; secondly, the centroid coordinates of each marker point on the three-...

Embodiment 2

[0097] According to the method for correcting a geometric correction phantom in the above embodiments of the present invention, an embodiment of the present invention further provides a correction system for a geometric correction phantom.

[0098] Figure 7 It is a schematic diagram of the composition and structure of the correction system of the geometric correction phantom according to the second embodiment of the present invention. Such as Figure 7 As shown, the correction system of the geometric correction phantom in the second embodiment includes a coordinate acquisition unit 201, an assignment unit 202, a parameter acquisition unit 203, a reconstruction unit 204, a processing unit 205, an update unit 206, and a judgment unit 207;

[0099] The coordinate acquisition unit 201 is used to scan the prefabricated geometric correction phantom through the spiral CT system, and calculate the spatial coordinate values ​​of the preset marker points on the geometric correction ph...

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 relates to a method and system for correcting a geometric correction phantom. The method includes: scanning the geometric correction phantom to calculate the spatial coordinate value of a marked point; Assign initial values ​​to the particles; scan the geometric correction phantom to obtain the projected coordinates of the marked points, and determine the geometric correction parameters corresponding to each particle according to the projected coordinate values ​​of the marked points and the particle values ​​of each particle; use the geometric correction parameters to reconstruct the evaluation phantom by scanning The three-dimensional image of the evaluation phantom corresponding to each particle; calculate the fitness value of each particle according to the three-dimensional image; update the spatial coordinate value of the marked point according to the fitness value; judge whether the preset iteration end condition is met; if not, return A step of assigning initial values ​​to a preset number of particles according to the current space coordinates of the marked points. By adopting the solution of the invention, the processing requirements of the correction phantom can be reduced, and the geometric correction phantom with low precision can be used for accurate geometric correction.

Description

technical field [0001] The invention relates to the field of CT technology, in particular to a method and system for correcting a geometric correction phantom. Background technique [0002] Computed Tomography (CT) is an imaging technique that obtains all cross-sectional tomographic information of an object within the scanning range by detecting ray projections from different angles of the object. Because CT technology has the advantages of non-contact, non-destructive, and high resolution, it is widely used in clinical medicine, industry, materials, biology and other fields. In the CT system, since the images reconstructed by the CT system are reversely calculated through projections from different angles, the geometric model of the CT system is relatively high. For example, in the circular orbital CT scanning scheme, it requires that the X-ray source, the center of the measured object, and the center of the detector array be on a straight line. However, after the CT is m...

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 Patents(China)
IPC IPC(8): G06T5/00G06T15/20
CPCG06T5/006G06T15/205G06T2207/10124G06T2207/10081G06T2215/06A61B6/03G01N23/044
Inventor 李翰威张光彪詹欣智黄文记黄科明
Owner GUANGZHOU HUARUI TECH