1. A DR space resolution automatic detection and calculation method is characterized by comprising the following steps:

the method comprises the following steps: using a DR spatial resolution test card;

step two: analyzing the detection image of the test card by using image processing software, and taking an image within 60% of the central area of the line pair as an analysis object;

step three: calculating the modulation value of each group of line pairs according to a formula 1;

step four: obtaining a relation curve between the modulation value and the line diameter through curve fitting, wherein when the modulation value is 20%, the corresponding line diameter value is a spatial resolution line diameter value;

step five: the logarithm of the spatial resolution line is calculated according to equation 2.

2. The method of claim 1, wherein the DR spatial resolution automatic detection and calculation method comprises: dip in formula 1 is a modulation value; a. the₁A first minimum amplitude value relative to a baseline; a. the₂A second minimum amplitude value relative to baseline; a. the₃A third minimum amplitude value relative to the baseline; b is₁Is a relative baseline A₁And A₂Minimum amplitude values corresponding to the minimum values therebetween; b is₂Is a relative baseline A₂And A₃Minimum amplitude values corresponding to the minimum values therebetween; a. the_nIs the nth minimum amplitude value relative to the baseline; a. the_n+1Is the (n + 1) th minimum amplitude value relative to the baseline; b is_nIs a relative baseline A_nAnd A_n+1With minimum values in between corresponding minimum amplitude values.

3. The method of claim 1, wherein the DR spatial resolution automatic detection and calculation method comprises: SR in equation 2_{Wire pair}Is the logarithm of the line of spatial resolution, with the unit of line pair per centimeter (Lp/cm); SR_{Wire diameter}The line diameter value of spatial resolution is in millimeters (mm).

Background

Spatial resolution, also known as high contrast resolution, refers to the ability to identify fine structures under high contrast conditions, i.e., the ability to display minimal volume lesions or structures. In evaluating the quality of DR images, spatial resolution is often first considered. For a DR digital ray detection system, the performance of a DR detector determines the performance of the whole system, the system resolution is an important index for representing the performance of the DR detector system, and the minimum geometric detail which can be distinguished by the DR detector is given.

Currently, different people can generate different evaluation results for the same equipment system detection, because the results depend on subjective judgment of people to some extent. Therefore, a novel DR space resolution automatic detection and calculation method is provided, and the method has the following obvious advantages: the method has the advantages of low requirement on detection, easy realization, easy arrangement and positioning, objective measurement result and strict quantification.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.

The present invention has been made in view of the problems existing in the conventional spatial resolution calculation.

Therefore, the invention aims to provide a DR spatial resolution automatic detection and calculation method, which can improve the calculation efficiency in the use process and has simple and convenient calculation process.

To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:

a DR space resolution automatic detection and calculation method comprises the following steps:

the method comprises the following steps: using a DR spatial resolution test card;

step two: analyzing the detection image of the test card by using image processing software, and taking an image within 60% of the central area of the line pair as an analysis object;

step three: calculating the modulation value of each group of line pairs according to a formula 1;

step four: obtaining a relation curve between the modulation value and the line diameter through curve fitting, wherein when the modulation value is 20%, the corresponding line diameter value is a spatial resolution line diameter value;

step five: the logarithm of the spatial resolution line is calculated according to equation 2.

As a preferable embodiment of the DR spatial resolution automatic detection and calculation method according to the present invention, wherein: dip in formula 1 is a modulation value; a. the₁A first minimum amplitude value relative to a baseline; a. the₂A second minimum amplitude value relative to baseline; a. the₃A third minimum amplitude value relative to the baseline; b is₁Is a relative baseline A₁And A₂Minimum amplitude values corresponding to the minimum values therebetween; b is₂Is a relative baseline A₂And A₃Minimum amplitude values corresponding to the minimum values therebetween; a. the_nIs the nth minimum amplitude value relative to the baseline; a. the_n+1Is the (n + 1) th minimum amplitude value relative to the baseline; b is_nIs a relative baseline A_nAnd A_n+1With minimum values in between corresponding minimum amplitude values.

As a preferable embodiment of the DR spatial resolution automatic detection and calculation method according to the present invention, wherein: SR in equation 2_{Wire pair}Is the logarithm of the line of spatial resolution, with the unit of line pair per centimeter (Lp/cm); SR_{Wire diameter}The line diameter value of spatial resolution is in millimeters (mm).

Compared with the prior art, the invention has the beneficial effects that: the polynomial regression equation is obtained, the line diameters and the system resolution corresponding to different recognition rates are conveniently and automatically calculated, more accurate DR spatial resolution can be obtained, a good analysis and calculation tool is provided for DR spatial resolution testing, and calculation accuracy and convenience of DR spatial resolution are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail with reference to the accompanying drawings and detailed embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise. Wherein:

FIG. 1 is a schematic view of a test card according to the present invention;

FIG. 2 is a diagram illustrating a scheduling value structure according to the present invention;

FIG. 3 is a schematic diagram of a curve fitting structure according to the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and it will be apparent to those of ordinary skill in the art that the present invention may be practiced without departing from the spirit and scope of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Next, the present invention will be described in detail with reference to the drawings, wherein for convenience of illustration, the cross-sectional view of the device structure is not enlarged partially according to the general scale, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

A DR space resolution automatic detection and calculation method comprises the following steps:

the method comprises the following steps: using a DR spatial resolution test card;

step two: analyzing the detection image of the test card by using image processing software, and taking an image within 60% of the central area of the line pair as an analysis object;

step three: calculating the modulation value of each group of line pairs according to a formula 1;

step four: obtaining a relation curve between the modulation value and the line diameter through curve fitting, wherein when the modulation value is 20%, the corresponding line diameter value is a spatial resolution line diameter value;

step five: the logarithm of the spatial resolution line is calculated according to equation 2.

Specifically, Dip in formula 1 is a modulation value; a. the₁A first minimum amplitude value relative to a baseline; a. the₂A second minimum amplitude value relative to baseline; a. the₃A third minimum amplitude value relative to the baseline; b is₁Is a relative baseline A₁And A₂Minimum amplitude values corresponding to the minimum values therebetween; b is₂Is a relative baseline A₂And A₃Minimum amplitude values corresponding to the minimum values therebetween; a. the_nIs the nth minimum amplitude value relative to the baseline; a. the_n+1Is the (n + 1) th minimum amplitude value relative to the baseline; b is_nIs a relative baseline A_nAnd A_n+1With minimum values in between corresponding minimum amplitude values.

Specifically, SR in equation 2_{Wire pair}Is the logarithm of the line of spatial resolution, with the unit of line pair per centimeter (Lp/cm); SR_{Wire diameter}The line diameter value of spatial resolution is in millimeters (mm).

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.