Microscopic CT (Computed Tomography) geometric calibration die body

Abstract

The invention discloses a microscopic CT geometric calibration die body, and relates to the field of CT calibration, and the microscopic CT geometric calibration die body comprises a base body and positioning balls; a plurality of fixing clamping grooves are formed in the base body; the plurality of fixed clamping grooves spirally surround the base body; the positioning ball is fixed in the fixing clamping groove and used for calibrating the geometric parameters of the microscopic CT system, the geometric parameters of the CT system can be indirectly solved, the CT system is calibrated, and the imaging quality is improved.

Description

Technical Field

[0001] The present application relates to the field of CT calibration, and in particular to a micro-CT geometric calibration phantom. Background Art

[0002] X-ray computed tomography (CT) can perform high-resolution three-dimensional imaging of the internal structure of an object without loss, and its spatial resolution can even reach the sub-micron level. It is widely used in the fields of new drug development, petroleum geology, and new material research, and is an important tool for industrial production and scientific research. Micro-CT high-resolution imaging depends on accurate CT system geometric parameters. Inaccurate geometric parameters will cause geometric artifacts in the reconstructed image, reduce the spatial resolution of the image, and even affect the image quality in severe cases. However, due to reasons such as equipment packaging, the geometric parameters of the micro-CT system are usually difficult to measure directly. Summary of the invention

[0003] The purpose of this application is to provide a micro-CT geometric calibration phantom to indirectly restore the geometric parameters of the micro-CT system to solve the problem that the geometric parameters of the micro-CT system are usually difficult to measure directly.

[0004] To achieve the above objectives, this application provides the following solutions:

[0005] In a first aspect, the present application provides a micro-CT geometric calibration phantom, comprising: a base body and a positioning sphere;

[0006] The base is provided with a plurality of fixing slots; the plurality of fixing slots surround the base in a spiral shape;

[0007] The positioning ball is fixed in the fixed slot and is used to calibrate the geometric parameters of the micro-CT system.

[0008] According to the specific embodiments provided in the present application, the present application discloses the following technical effects: the present application provides a micro-CT geometric calibration phantom, in which a positioning ball is spirally wrapped around a base through a fixed slot. By scanning the micro-CT geometric calibration phantom and utilizing the interdependence between the scanning data and the geometric parameters of the CT system, the geometric parameters of the CT system are indirectly solved to calibrate the CT system and improve the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 This is a schematic diagram of a micro-CT geometric calibration phantom structure in one embodiment of the present application;

[0011] Figure 2 This is a schematic diagram of a micro-CT geometric calibration phantom structure in another embodiment of the present application. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0013] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0014] like Figure 1 As shown, a micro-CT geometric calibration phantom provided in an embodiment of the present application includes: a base 1 and a positioning ball 2; the base is provided with a plurality of fixed slots 3; the plurality of fixed slots 3 spirally surround the base 1; the positioning ball 2 is fixed in the fixed slots 3, and is used to calibrate the geometric parameters of the micro-CT system.

[0015] In an exemplary embodiment, one fixing slot 3 corresponds to one positioning ball 2. The positioning ball 2 is fixed in the base body 1 by polymerization.

[0016] In an exemplary embodiment, Figure 2 As shown, it also includes: a base 4; the base 1 is arranged on the base 4.

[0017] Furthermore, the base 4 is a hollow structure 5, and the base 1 is an acrylic cylinder; the acrylic cylinder is a hollow structure.

[0018] In an exemplary embodiment, the positioning ball 2 is a metal ball.

[0019] In an exemplary embodiment, the height of the fixed slot 3 is determined by the height teeth, and the rotational positioning angle of the fixed slot 3 is determined by the dividing plate, thereby determining the position of each positioning ball 2 on the base 1, and the positioning balls 2 are aggregated at the position of the fixed slot 3 of the base 1, and finally the periphery of the base 1 is wrapped with an acrylic layer to ensure the strength of the micro-CT geometric calibration model.

[0020] like Figure 2As shown, the radiation is emitted to one side of the substrate 1 and is imaged on the imaging plate located on the other side of the substrate 1 .

[0021] The method of restoring the geometric parameters of a micro-CT system using the micro-CT geometric calibration phantom includes the following steps: performing a CT scan on the micro-CT geometric calibration phantom using the micro-CT system to obtain scanning data of the micro-CT geometric calibration phantom; extracting projection position information of the metal ball from the scanning data using the interdependence between the scanning data and the geometric parameters of the CT system; and estimating the geometric parameters of the micro-CT system using the obtained position information, thereby indirectly solving the geometric parameters of the CT system.

[0022] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0023] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A micro-CT geometric calibration phantom, characterized in that: The micro-CT geometric calibration phantom comprises: a base body and a positioning sphere; The base is provided with a plurality of fixing slots; the plurality of fixing slots surround the base in a spiral shape; The positioning ball is fixed in the fixed slot and is used to calibrate the geometric parameters of the micro-CT system.

2. The micro-CT geometric calibration phantom according to claim 1, characterized in that: One fixed card slot corresponds to one positioning ball.

3. The micro-CT geometric calibration phantom according to claim 1, characterized in that: Also includes: Pedestal; The base is arranged on the base.

4. The micro-CT geometric calibration phantom according to claim 3, characterized in that: The base is a hollow structure.

5. The micro-CT geometric calibration phantom according to claim 3, characterized in that: The substrate is an acrylic cylinder.

6. The micro-CT geometric calibration phantom according to claim 5, characterized in that: The acrylic cylinder is a hollow structure.

7. The micro-CT geometric calibration phantom according to any one of claims 1 to 5, characterized in that: The positioning ball is a metal ball.

8. The micro-CT geometric calibration phantom according to claim 1, characterized in that: The height of the fixed slot is determined by the height teeth.

9. The micro-CT geometric calibration phantom according to claim 1, characterized in that: The rotation angle of the fixed slot is determined by the indexing plate.

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