Method and system for screening characteristics of anterior and posterior condylar bone absorption images in orthognathic surgery

Abstract

The invention provides a method and a system for screening characteristics of an absorption image of a condylar process bone before and after orthognathic surgery, and relates to the technical field of oral medical treatment, and the method comprises the following steps: processing a preprocessed pre-operative temporomandibular joint cone beam CT image and a post-operative temporomandibular joint cone beam CT image in a first time period; obtaining a corresponding first feature value set, a second feature value set, a third feature value set and a fourth feature value set, processing the first feature value set, the second feature value set, the third feature value set and the fourth feature value set, and judging whether a processing result can reflect features related to the condylar bone absorption height or not; according to the method, by obtaining the pre-operation and post-operation temporomandibular joint cone beam CT images of the orthognathic patient and carrying out feature extraction and difference calculation, the features highly related to condylar process bone absorption can be accurately screened out, and the accuracy of feature extraction is ensured.

Description

Technical Field

[0001] The present invention relates to the field of oral medical technology, and more particularly to a method and system for screening image characteristics of condylar bone absorption before and after orthognathic surgery. Background Art

[0002] At present, the purpose of orthognathic surgery is to adjust the inharmonious dental arch and jaw relationship, eliminate jaw interference, align the dentition, and eliminate compensatory inclination of the teeth, so that the cut bone segment can be smoothly moved to the designed correction position during the operation and a good jaw relationship can be established.

[0003] However, the morphology of the condylar bone will change after orthognathic surgery. Condylar bone resorption is an irreversible complication after orthognathic surgery. When the condylar bone undergoes functional remodeling after surgery, it will cause the mandibular ramus to shorten, which is one of the main reasons for the recurrence of postoperative deformity. Therefore, how to correctly obtain the characteristics of the changes in the condylar bone before and after orthognathic surgery will help to build a prediction model for condylar bone resorption after orthognathic surgery, thereby guiding clinical treatment decisions and achieving the best results; however, the existing technology lacks a method for obtaining characteristics that are highly correlated with condylar bone resorption.

[0004] Therefore, how to provide a method for screening the imaging characteristics of condylar bone absorption before and after orthognathic surgery that can solve the above problems is an issue that those skilled in the art urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a method and system for screening image features of condylar bone absorption before and after orthognathic surgery. By acquiring cone beam CT images of the temporomandibular joint of orthognathic patients before and after surgery, and performing feature extraction and difference calculation, features highly correlated with condylar bone absorption can be accurately screened out, thereby ensuring the accuracy of feature extraction.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A method for screening image features of condylar bone absorption before and after orthognathic surgery, comprising the following steps:

[0008] Obtain the preoperative cone beam CT images of the temporomandibular joint and the cone beam CT images of the temporomandibular joint in the first period after surgery of multiple orthognathic patients, and pre-process the preoperative cone beam CT images of the temporomandibular joint and the cone beam CT images of the temporomandibular joint in the first period after surgery;

[0009] The pre-operative cone beam CT images of the temporomandibular joint that have been pre-processed and the post-operative cone beam CT images of the temporomandibular joint are divided into a control group and an absorption group, and feature extraction is performed on the regions of interest of the cone beam CT images of the temporomandibular joint of the control group and the absorption group, respectively, to obtain the corresponding first eigenvalue set and second eigenvalue set, and feature extraction is performed on the cone beam CT images of the temporomandibular joint of the control group and the absorption group in the first period after surgery, respectively, to obtain the corresponding third eigenvalue set and fourth eigenvalue set;

[0010] The first eigenvalue set, the second eigenvalue set, the third eigenvalue set and the fourth eigenvalue set are processed, and it is determined whether the processing results can reflect the characteristics highly correlated with condylar bone absorption.

[0011] Preferably, the specific process of obtaining the corresponding first eigenvalue set includes:

[0012] Extracting a region of interest from the control group to obtain a corresponding first region of interest extraction result;

[0013] The first region of interest extraction result is processed and screened using the Pyradiomics tool to obtain a corresponding first eigenvalue set.

[0014] Preferably, the specific process of obtaining the corresponding second eigenvalue set includes:

[0015] Extracting a region of interest from the absorption group to obtain a second region of interest extraction result;

[0016] The second region of interest extraction result is processed and screened using the Pyradiomics tool to obtain a corresponding second eigenvalue set.

[0017] Preferably, the specific processing process of determining whether the processing result can reflect the characteristics highly related to condylar bone absorption includes:

[0018] Obtaining an absolute value of a difference between the first eigenvalue set and the third eigenvalue set to obtain a fifth eigenvalue set, and simultaneously obtaining an absolute value of a difference between the second eigenvalue set and the fourth eigenvalue set to obtain a sixth eigenvalue set;

[0019] Performing feature screening on the first feature value set and the second feature value set to obtain a screening feature set A, and performing feature screening on the fifth feature value set and the sixth feature value set to obtain a screening feature set B;

[0020] When the feature set B is included in the feature set A, it indicates that the screened features can reflect the features highly related to condylar bone absorption.

[0021] Preferably, the specific process of preprocessing the preoperative cone beam CT image of the temporomandibular joint and the postoperative cone beam CT image of the temporomandibular joint includes:

[0022] filtering and resizing the preoperative cone beam CT image of the temporomandibular joint and the postoperative cone beam CT image of the temporomandibular joint;

[0023] The filtered and resized preoperative CBCT images of the temporomandibular joint and the postoperative CBCT images of the temporomandibular joint are registered.

[0024] The present invention also provides a system for screening image characteristics of condylar bone absorption before and after orthognathic surgery, comprising:

[0025] A data acquisition and preprocessing module is used to obtain cone beam CT images of the temporomandibular joint before and after the operation of multiple orthognathic patients, and to preprocess the cone beam CT images of the temporomandibular joint before and after the operation;

[0026] An extraction module is used to divide the pre-operative cone beam CT images of the temporomandibular joint and the post-operative cone beam CT images of the temporomandibular joint into a control group and an absorption group, and perform feature extraction on the regions of interest of the cone beam CT images of the temporomandibular joint of the control group and the absorption group respectively to obtain the corresponding first eigenvalue set and second eigenvalue set, and perform feature extraction on the cone beam CT images of the temporomandibular joint of the control group and the absorption group in the first period after surgery to obtain the corresponding third eigenvalue set and fourth eigenvalue set;

[0027] A screening module is used to process the first eigenvalue set, the second eigenvalue set, the third eigenvalue set and the fourth eigenvalue set, and determine whether the processing results can reflect the characteristics highly related to condylar bone absorption.

[0028] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a method and system for screening image features of condylar bone absorption before and after orthognathic surgery, which has the following beneficial effects:

[0029] 1. The present invention can accurately obtain important imaging features related to condylar bone absorption by extracting features and identifying regions of interest from preoperative and postoperative images, thereby providing data support for subsequent clinical decision-making;

[0030] 2. The present invention can clearly identify the changes before and after surgery by calculating the difference between the control group and the absorption group before and after surgery, which is helpful to evaluate the degree of bone resorption;

[0031] 3. The present invention can reduce the interference of irrelevant features on the analysis results by screening the features that are highly relevant to condylar bone absorption;

[0032] 4. By effectively monitoring and evaluating the condylar bone absorption, the present invention enables doctors to more accurately judge the surgical effect and adjust the subsequent treatment plan in a timely manner, thereby improving the patient's recovery quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 An overall flow chart of a method for screening image features of condylar bone absorption before and after orthognathic surgery provided by the present invention;

[0035] Figure 2 A schematic diagram of a preoperative region of interest extraction result provided by an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of condylar bone absorption results provided by an embodiment of the present invention;

[0037] Figure 4 A schematic diagram of the number of features obtained by screening images at the T1 time point provided in an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of the number of features screened out by feature differences provided in an embodiment of the present invention;

[0039] Figure 6 This is a structural principle block diagram of a system for screening image features of condylar bone absorption before and after orthognathic surgery provided by the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1 As shown, the embodiment of the present invention discloses a method for screening image features of condylar bone absorption before and after orthognathic surgery, comprising the following steps:

[0042] Obtain the preoperative cone beam CT images of the temporomandibular joint and the cone beam CT images of the temporomandibular joint in the first period after surgery of multiple orthognathic patients, and pre-process the preoperative cone beam CT images of the temporomandibular joint and the cone beam CT images of the temporomandibular joint in the first period after surgery;

[0043] The pre-operative cone beam CT images of the temporomandibular joint that have been pre-processed and the post-operative cone beam CT images of the temporomandibular joint are divided into a control group and an absorption group, and feature extraction is performed on the regions of interest of the cone beam CT images of the temporomandibular joint of the control group and the absorption group, respectively, to obtain the corresponding first eigenvalue set and second eigenvalue set, and feature extraction is performed on the cone beam CT images of the temporomandibular joint of the control group and the absorption group in the first period after surgery, respectively, to obtain the corresponding third eigenvalue set and fourth eigenvalue set;

[0044] The first eigenvalue set, the second eigenvalue set, the third eigenvalue set and the fourth eigenvalue set are processed, and it is determined whether the processing results can reflect the characteristics highly correlated with condylar bone absorption.

[0045] In a specific embodiment, the specific process of obtaining the corresponding first eigenvalue set includes:

[0046] Extracting a region of interest from the control group to obtain a corresponding first region of interest extraction result;

[0047] The first region of interest extraction result is processed and screened using the Pyradiomics tool to obtain a corresponding first eigenvalue set.

[0048] In a specific embodiment, the specific process of obtaining the corresponding second eigenvalue set includes:

[0049] Extracting a region of interest from the absorption group to obtain a second region of interest extraction result;

[0050] The second region of interest extraction result is processed and screened using the Pyradiomics tool to obtain the corresponding second eigenvalue set. The specific results of the first eigenvalue set and the second eigenvalue set can be found in Figure 2-3 As shown, the process of obtaining the third eigenvalue set and the fourth eigenvalue set is consistent with the process of obtaining the first eigenvalue set and the second eigenvalue set.

[0051] In a specific embodiment, the specific processing process of determining whether the processing result can reflect the characteristics highly related to condylar bone absorption includes:

[0052] Obtaining an absolute value of a difference between the first eigenvalue set and the third eigenvalue set to obtain a fifth eigenvalue set, and simultaneously obtaining an absolute value of a difference between the second eigenvalue set and the fourth eigenvalue set to obtain a sixth eigenvalue set;

[0053] Performing feature screening on the first feature value set and the second feature value set to obtain a screening feature set A, and performing feature screening on the fifth feature value set and the sixth feature value set to obtain a screening feature set B, wherein the feature screening process can be achieved by statistics and analysis of features;

[0054] When the feature set B is included in the feature set A, it means that the selected features can reflect the features highly related to condylar bone absorption. For specific results, see Figure 4-5 shown.

[0055] In a specific embodiment, the specific process of preprocessing the preoperative cone beam CT image of the temporomandibular joint and the postoperative cone beam CT image of the temporomandibular joint includes:

[0056] filtering and resizing the preoperative cone beam CT image of the temporomandibular joint and the postoperative cone beam CT image of the temporomandibular joint;

[0057] The filtered and resized preoperative CBCT images of the temporomandibular joint and the postoperative CBCT images of the temporomandibular joint are registered.

[0058] See also Figure 6 As shown, an embodiment of the present invention further provides a system for screening the image characteristics of condylar bone absorption before and after orthognathic surgery using any one of the above embodiments, comprising:

[0059] A data acquisition and preprocessing module is used to obtain cone beam CT images of the temporomandibular joint before and after the operation of multiple orthognathic patients, and to preprocess the cone beam CT images of the temporomandibular joint before and after the operation;

[0060] An extraction module is used to divide the pre-operative cone beam CT images of the temporomandibular joint and the post-operative cone beam CT images of the temporomandibular joint into a control group and an absorption group, and perform feature extraction on the regions of interest of the cone beam CT images of the temporomandibular joint of the control group and the absorption group respectively to obtain the corresponding first eigenvalue set and second eigenvalue set, and perform feature extraction on the cone beam CT images of the temporomandibular joint of the control group and the absorption group in the first period after surgery to obtain the corresponding third eigenvalue set and fourth eigenvalue set;

[0061] A screening module is used to process the first eigenvalue set, the second eigenvalue set, the third eigenvalue set and the fourth eigenvalue set, and determine whether the processing results can reflect the characteristics highly related to condylar bone absorption.

[0062] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0063] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for screening image features of condylar bone absorption before and after orthognathic surgery, characterized in that: The following steps are involved: Obtain the preoperative cone beam CT images of the temporomandibular joint and the cone beam CT images of the temporomandibular joint in the first period after surgery of multiple orthognathic patients, and pre-process the preoperative cone beam CT images of the temporomandibular joint and the cone beam CT images of the temporomandibular joint in the first period after surgery; The pre-operative cone beam CT images of the temporomandibular joint that have been pre-processed and the post-operative cone beam CT images of the temporomandibular joint are divided into a control group and an absorption group, and feature extraction is performed on the regions of interest of the cone beam CT images of the temporomandibular joint of the control group and the absorption group, respectively, to obtain the corresponding first eigenvalue set and second eigenvalue set, and feature extraction is performed on the cone beam CT images of the temporomandibular joint of the control group and the absorption group in the first period after surgery, respectively, to obtain the corresponding third eigenvalue set and fourth eigenvalue set; The first eigenvalue set, the second eigenvalue set, the third eigenvalue set and the fourth eigenvalue set are processed, and it is determined whether the processing results can reflect the characteristics highly correlated with condylar bone absorption.

2. The method for screening image features of condylar bone absorption before and after orthognathic surgery according to claim 1, characterized in that: The specific process of obtaining the corresponding first eigenvalue set includes: Extracting a region of interest from the control group to obtain a corresponding first region of interest extraction result; The first region of interest extraction result is processed and screened using the Pyradiomics tool to obtain a corresponding first eigenvalue set.

3. The method for screening image features of condylar bone absorption before and after orthognathic surgery according to claim 2, characterized in that: The specific process of obtaining the corresponding second eigenvalue set includes: Extracting a region of interest from the absorption group to obtain a second region of interest extraction result; The second region of interest extraction result is processed and screened using the Pyradiomics tool to obtain a corresponding second eigenvalue set.

4. The method for screening image features of condylar bone absorption before and after orthognathic surgery according to claim 3, characterized in that: The specific process of judging whether the treatment results can reflect the characteristics related to the height of condylar bone absorption includes: Obtaining an absolute value of a difference between the first eigenvalue set and the third eigenvalue set to obtain a fifth eigenvalue set, and simultaneously obtaining an absolute value of a difference between the second eigenvalue set and the fourth eigenvalue set to obtain a sixth eigenvalue set; Performing feature screening on the first feature value set and the second feature value set to obtain a screening feature set A, and performing feature screening on the fifth feature value set and the sixth feature value set to obtain a screening feature set B; When the feature set B is included in the feature set A, it indicates that the screened features can reflect the features highly related to condylar bone absorption.

5. The method for screening image features of condylar bone absorption before and after orthognathic surgery according to claim 1, characterized in that: The specific process of preprocessing the preoperative cone beam CT image of the temporomandibular joint and the postoperative cone beam CT image of the temporomandibular joint includes: filtering and resizing the preoperative cone beam CT image of the temporomandibular joint and the postoperative cone beam CT image of the temporomandibular joint; The filtered and resized preoperative CBCT images of the temporomandibular joint and the postoperative CBCT images of the temporomandibular joint are registered.

6. A system using the method for screening image features of condylar bone absorption before and after orthognathic surgery according to any one of claims 1 to 5, characterized in that: include: A data acquisition and preprocessing module is used to obtain cone beam CT images of the temporomandibular joint before and after the operation of multiple orthognathic patients, and to preprocess the cone beam CT images of the temporomandibular joint before and after the operation; An extraction module is used to divide the pre-operative cone beam CT images of the temporomandibular joint and the post-operative cone beam CT images of the temporomandibular joint into a control group and an absorption group, and perform feature extraction on the regions of interest of the cone beam CT images of the temporomandibular joint of the control group and the absorption group respectively to obtain the corresponding first eigenvalue set and second eigenvalue set, and perform feature extraction on the cone beam CT images of the temporomandibular joint of the control group and the absorption group in the first period after surgery to obtain the corresponding third eigenvalue set and fourth eigenvalue set; A screening module is used to process the first eigenvalue set, the second eigenvalue set, the third eigenvalue set and the fourth eigenvalue set, and determine whether the processing results can reflect the characteristics highly related to condylar bone absorption.

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