A dental intelligent exposure control method and device

Abstract

The application provides a kind of dental intelligent exposure control method and device, suitable for the wireless connection of detector and high voltage generator;The method comprises: detector opens exposure window;Through the intelligent identification exposure field of the exposure window to the region to be detected;When meeting exposure gate breaking decision condition, detector controls high voltage generator gate breaking exposure;After closing exposure window, image acquisition is carried out to detector.The application solves the problems of limited automatic exposure control function in dental shooting scene, exposure error caused by transmission delay and the like, and reduces the exposure dose suffered by patient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flat panel detector, in particular to a dental intelligent exposure control method and device. BACKGROUND

[0002] Flat panel detector is a new X-ray image detection technology, which is characterized by fast imaging speed and high resolution, and is widely used in medical detection, non-destructive testing, security check, anti-terrorism and other fields. During the exposure imaging process of the flat panel detector, the user needs to select the exposure quality and dose according to the thickness and density of the object being photographed, which has a high degree of experience dependence and is difficult to control.

[0003] At present, the traditional AEC (Automatic Exposure Control) detects the exposure dose by means of ionization chamber (mainly gaseous ionization chamber and solid ionization chamber), and the output signal voltage increases linearly with the increase of exposure dose. The high-voltage generator detects the output signal voltage in real time, and when the voltage reaches the set threshold voltage, the high-voltage generator stops the exposure. However, the traditional AEC needs to increase the ionization chamber on the surface of the flat panel detector, and the ionization chamber is connected with the high-voltage generator through a special cable, which has high complexity and cost. In addition, the detector is placed in the mouth, and it is difficult to realize the correspondence between the field of view and the tooth position, which cannot well adapt to various application scenarios of the intraoral dental detector. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a dental intelligent exposure control method and device to solve the problems of limited use scene in the intelligent exposure process of the prior art, exposure error caused by transmission delay and the like.

[0005] To achieve the above-mentioned purposes and other related purposes, the present application provides a dental intelligent exposure control method, which is suitable for wireless connection between a detector and a high-voltage generator; the method comprises:

[0006] opening an exposure window of the detector;

[0007] intelligently identifying and irradiating a field of view on a detection area through the exposure window;

[0008] when the exposure stop determination condition is met, the detector controls the high-voltage generator to stop the exposure;

[0009] after closing the exposure window, the detector is used to collect images.

[0010] Preferably, the method further comprises: detecting in real time before the detector opens the exposure window to determine whether the exposure start determination condition is met.

[0011] Preferably, the detector also automatically acquires link delay information between the detector and the high-voltage generator when performing real-time detection.

[0012] Preferably, the exposure opening determination condition is an increase in the real-time gray value detected by the detector.

[0013] Preferably, the exposure closing determination condition includes a first closing condition or a second closing condition; the first closing condition is that the actual exposure time is greater than or equal to a set time threshold; and the second closing condition is that the exposure dose is greater than or equal to a set dose threshold.

[0014] Preferably, a closing instruction is generated according to the exposure closing determination condition and the link delay time, and the high-voltage generator is controlled to close the exposure according to the closing instruction.

[0015] Preferably, the intelligent identification of the irradiation field is determined by a plurality of partial fields of view or a full field of view scanning mode.

[0016] Preferably, when the irradiation field is determined by a plurality of partial fields of view, the exposure dose reaching the set dose threshold is that the gray values of the plurality of partial fields of view reach the set dose threshold according to a set logical relationship.

[0017] Preferably, the set logical relationship is weighted average or logical AND or logical OR.

[0018] To achieve the above object and other related objects, the present application further provides a dental intelligent exposure control device, which comprises an exposure determination control module, an intelligent identification module, an exposure closing control module, and an image acquisition module.

[0019] The exposure determination control module is configured to open an exposure window by a detector.

[0020] The intelligent identification module is configured to intelligently identify an irradiation field of a to-be-detected area through the exposure window.

[0021] The closing control module is configured to control the high-voltage generator to close the exposure by the detector when the exposure closing determination condition is met.

[0022] The image acquisition module is configured to acquire an image of the detector after the exposure window is closed.

[0023] As described above, the dental intelligent exposure control method and device of the present application have the following beneficial effects:

[0024] The application extends the automatic exposure control to the intraoral dental detector, realizes the accurate control of the automatic exposure gate, and is suitable for wired and wireless signal transmission links, can reduce the complexity and cost of the system, can be highly programmable, and is convenient for increasing logical selection and other functions, thereby promoting the further popularization of the intelligent exposure control technology and reducing the exposure dose error. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A flowchart diagram of the dental intelligent exposure control method of the application is shown. DETAILED DESCRIPTION

[0026] The advantages and effects of the application can be easily understood by those skilled in the art from the disclosure of the specification. The application can also be implemented or applied in other different specific embodiments, and the details in the specification can be modified or changed in various ways based on different views and applications without departing from the spirit of the application.

[0027] Please refer to Figure 1 It should be noted that the diagrams provided in the embodiments only schematically illustrate the basic concept of the application, and the diagrams only show the components related to the application, not the number, shape and size of the components during actual implementation. The actual implementation of each component can be randomly changed in terms of shape, number and proportion, and the layout pattern of the components can be more complex.

[0028] The application places the detector in a medical system (including DR, CT, security inspection machine and other systems using flat panel detectors), connects the detector with a computer to realize instruction interaction and image transmission, wirelessly connects the detector with a high-voltage control box, connects the high-voltage control box to a high-voltage generator, or directly wirelessly connects the detector with the high-voltage generator.

[0029] The dental intelligent exposure control method of the application is suitable for wireless connection between the detector and the high-voltage generator, and the method comprises the following steps.

[0030] S1, the detector opens an exposure window.

[0031] Before performing the step, it is necessary to detect whether the detector meets the exposure opening judgment condition, and the exposure window is opened only when the exposure opening judgment condition is met; otherwise, it is always looped to judge whether the exposure opening judgment condition is met. The exposure opening judgment condition is that the real-time gray value detected by the detector is increased, and in other embodiments, the real-time gray value is greater than a preset threshold.

[0032] In the embodiment of the present application, after the detector is turned on, the on-off condition between the detector and the high-voltage generator and the link delay information, i.e., the link delay time, are detected in real time, after the detector is preheated, a preset exposure cut-off dose threshold is set, and then exposure cut-off control and image acquisition are performed.

[0033] It should be noted that the detector itself also includes a processor and can realize detection of the gray scale.

[0034] S2, intelligently identifying the irradiation field of the to-be-detected area through the exposure window;

[0035] The irradiation field is the tooth, gum, or the like.

[0036] In the embodiment of the present application, the intelligent identification of the irradiation field position is determined by a plurality of local fields of view or full-field view scanning. Specifically, the irradiation field is selected by comparing the gray scales of a plurality of fields of view with a preset value, or the irradiation field is automatically identified as the area covered by the tooth according to the image gray scale detection result by full-field view scanning. For example, a few large teeth in the deep part of the oral cavity can be used as the irradiation field, the middle front teeth can be used as the irradiation field, all the teeth in the oral cavity can be used as the irradiation field, or the tooth and gum can be used as the irradiation field.

[0037] S3, when the exposure cut-off determination condition is met, the detector controls the high-voltage generator to cut off the exposure;

[0038] In the present application, the exposure cut-off determination condition includes a first closing condition or a second closing condition; the first closing condition is that the actual exposure time is greater than or equal to a set time threshold; and the second closing condition is that the exposure dose is greater than or equal to a set dose threshold.

[0039] Specifically, the first closing condition indicates that the detector is turned on for a long time and the irradiation field is not acquired, and the detector does not need to work, so the exposure window needs to be closed.

[0040] Specifically, the second closing condition indicates that the exposure dose reaches a preset value, and the exposure window needs to be closed and the exposure needs to be stopped. In the present application, reaching indicates being greater than or equal to.

[0041] When the irradiation field is determined by a plurality of local fields of view, the exposure dose reaching the set dose threshold is that the gray scale values of the plurality of local fields of view reach the set dose threshold according to a set logical relationship, i.e., the gray scale values of the plurality of local fields of view are compared with the set dose threshold according to the preset logical relationship.

[0042] In the embodiment of the present application, the logical relationship is set as, but is not limited to, weighted average, logical AND, logical OR, etc.; when the logical relationship is set as logical AND, the second closing condition is essentially that the gray values of the multiple local fields all need to reach the set dose threshold; that is, the minimum gray value among the gray values of the multiple local fields reaches the set dose threshold; when the logical relationship is set as logical OR, the second closing condition is essentially that the gray value of any local field reaches the set dose threshold; that is, the maximum gray value among the gray values of the multiple local fields reaches the set dose threshold; when the logical relationship is set as weighted average, the second closing condition is essentially that the mean value is calculated according to the weight of each local field, and the mean value reaches the set dose threshold.

[0043] The present application considers that there is a link delay in the information transmission process between the detector and the high-voltage generator, and therefore a closing instruction needs to be issued before the actual exposure window of the detector should be closed, so as to ensure accurate control of the exposure window of the detector and realize exposure gating.

[0044] Therefore, the present application generates a gating instruction according to the exposure gating determination condition and the link delay time, and controls the high-voltage generator to gate the exposure according to the gating instruction.

[0045] Specifically, when the first closing condition is that the exposure window opening time is greater than the set time, it is considered that the detector has not acquired the irradiation field, and the exposure window needs to be closed; if the closing instruction is closed after the exposure gating determination condition t1 is met, and the link delay time is t2, wherein t2 < t1, then the control instruction needs to be sent at t1-t2.

[0046] S4, image acquisition is performed on the detector after the exposure window is closed.

[0047] The detector of the present application is based on intelligent identification of the irradiation field, and accurate exposure dose control of the to-be-detected region is realized under the condition of accurate control of the exposure gating of the high-voltage generator.

[0048] Device embodiment:

[0049] In order to achieve the above technical purposes, the present application also provides a dental intelligent exposure control device, which comprises an exposure determination module, an intelligent identification module, an exposure gating control module and an image acquisition module.

[0050] The exposure determination module is configured to open the exposure window of the detector.

[0051] The intelligent identification module is configured to intelligently identify the irradiation field of the to-be-detected region through the exposure window.

[0052] The exposure gating module is configured to control the high-voltage generator to gate the exposure when the exposure gating determination condition is met.

[0053] The image acquisition module is configured to acquire images of the detector after the exposure window is closed.

[0054] As a further limitation of the present application, the intelligent recognition module determines by scanning in multiple partial fields of view or a full field of view.

[0055] In the embodiments of the present application, considering that there is a link delay in the information transmission process between the detector and the high-voltage generator, it is necessary to issue a closing instruction before the actual exposure window of the detector should be closed, so as to ensure accurate control of the exposure window of the detector and realize the exposure gate breaking. Therefore, the present application generates a closing instruction according to the exposure gate breaking determination condition and the link delay time, and controls the detector to close the exposure window according to the closing instruction.

[0056] In summary, the present application provides an intelligent exposure control technology with automatic recognition of tooth position, solves the problems of limited use scene, transmission delay leading to exposure error, etc., promotes the further popularization of intelligent exposure control technology, and reduces the exposure dose error. Therefore, the present application effectively overcomes the various shortcomings in the prior art and has high industrial utilization value.

[0057] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A dental intelligent exposure control method, characterized in that: Applicable to wireless connection between a detector and a high voltage generator; the method includes: The detector opens the exposure window; Intelligently identifying the area to be detected by irradiating the field through the exposure window; the irradiation field is the teeth and / or gum area; When the exposure cut-off judgment condition is met, the detector controls the high-voltage generator to cut off the exposure; After closing the exposure window, the detector is imaged; Real-time detection before the detector opens the exposure window to determine whether the exposure start judgment conditions are met; When the detector performs real-time detection, it also automatically obtains the link delay information between the detector and the high-voltage generator.

2. The dental intelligent exposure control method according to claim 1, characterized in that: The exposure start determination condition is that the real-time grayscale value detected by the detector increases.

3. The dental intelligent exposure control method according to claim 1, characterized in that: The exposure gate determination condition includes a first closing condition or a second closing condition; the first closing condition is that the actual exposure time is greater than or equal to a set time threshold; the second closing condition is that the exposure dose is greater than or equal to a set dose threshold.

4. The dental intelligent exposure control method according to claim 1, characterized in that: A gate-off instruction is generated according to the exposure gate-off determination condition and the link delay time, and the high-voltage generator is controlled to gate off the exposure according to the gate-off instruction.

5. The dental intelligent exposure control method according to claim 1, characterized in that: The intelligent identification radiation field is determined by scanning multiple local fields of view or the entire field of view.

6. The dental intelligent exposure control method according to claim 5, characterized in that: When the irradiation field is determined by multiple local fields of view, the exposure dose reaches the set dose threshold when the grayscale values ​​of the multiple local fields of view reach the set dose threshold according to a set logical relationship.

7. The dental intelligent exposure control method according to claim 6, characterized in that: The set logical relationship is weighted average or logical AND or logical OR.

8. A dental intelligent exposure control device, characterized in that: The device includes an exposure determination control module, an intelligent recognition module, an exposure gate control module and an image acquisition module; The exposure determination control module is configured to open an exposure window for the detector; The intelligent recognition module is configured to intelligently identify the radiation field of the area to be detected through the exposure window, and the radiation field is the teeth and / or gum area; The exposure cutoff control module is configured to control the high voltage generator to cut off exposure when the exposure cutoff determination condition is met; The image acquisition module is configured to acquire images of the detector after closing the exposure window.

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