CN112426163A - Auxiliary positioning method and system for X-ray medical equipment and computer storage medium - Google Patents
Auxiliary positioning method and system for X-ray medical equipment and computer storage medium Download PDFInfo
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Abstract
The invention relates to an auxiliary positioning method and system for X-ray medical equipment and a computer storage medium. According to one embodiment, a method of assisted positioning of an X-ray medical device comprises: acquiring an initial image of the object to be detected after the object to be detected is placed by utilizing a visible light image pick-up device; acquiring current images of an object to be detected in real time, and comparing each current image with the initial image; and when the deviation of the current image and the initial image at a certain moment reaches a set threshold value, providing prompt information. The invention can avoid poor image quality caused by the movement of the object to be detected and reduce the extra radiation dose born by the object to be detected due to repeated exposure.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to an auxiliary positioning method and an auxiliary positioning system for X-ray medical equipment and a computer storage medium.
Background
In X-ray examinations, proper positioning is crucial to obtaining satisfactory images. However, some examinations require that the object to be measured (e.g., a patient) be maintained in an uncomfortable posture, and it is often difficult for the patient to maintain the posture until the end of the exposure. This can result in motion artifacts in the resulting image. Furthermore, after positioning and before exposure, bone structures may overlap if the patient adjusts posture. These all affect the diagnosis and sometimes require a renewed exposure check.
At present, a doctor observes whether the arrangement position of a patient changes or not in a control room through an observation window, fixes the patient in a specific posture through a supporting component, or repeats exposure examination, but the problem cannot be effectively solved.
Disclosure of Invention
In view of the above, the present invention provides an auxiliary positioning method for an X-ray medical apparatus, including: acquiring an initial image of the object to be detected after the object to be detected is placed by utilizing a visible light image pick-up device; acquiring current images of an object to be detected in real time, and comparing each current image with the initial image; and when the deviation of the current image and the initial image at a certain moment reaches a set threshold value, providing prompt information.
The auxiliary positioning method of the X-ray medical equipment further comprises the following steps: determining a region of interest in the initial image; and determining a region of interest in each current image; wherein comparing each current image with the initial image refers to comparing a region of interest of each current image with a region of interest of the initial image.
Wherein comparing each current image to the initial image comprises: extracting at least one selected feature descriptor based on an image of a region of interest of the initial image; extracting at least one selected feature descriptor based on the image of the region of interest of each current image; and judging whether the deviation of the current image compared with the initial image reaches a set threshold value through a selected classifier by using the selected feature descriptors extracted from the initial image and each current image.
Wherein the set threshold comprises at least one preset value.
Wherein said at least one preset value falls between the intervals [ -1, 1 ].
Wherein the process can be carried out in stages, wherein the stages are selected from at least one of the following stages: a preparation stage before starting exposure; and an exposure phase after the exposure is started.
Wherein the set threshold of the preparation phase and the exposure phase is the same; or the set thresholds of the preparation phase and the exposure phase are different.
Wherein the set threshold is determined by the organ of the object to be tested or is manually input.
In another aspect, the present invention provides a computer storage medium having stored therein program instructions executable to implement any of the methods described above.
In another aspect, the present invention provides an auxiliary positioning system for an X-ray medical apparatus, comprising: the acquisition device is used for acquiring an initial image of the object to be detected after the object to be detected is placed and acquiring a current image of the object to be detected in real time; a comparison means for comparing each current image with the initial image; and the prompting device is used for providing prompting information when the deviation of the current image and the initial image at a certain moment reaches a set threshold value.
Wherein, the system also comprises a processing device, and the processing device is used for: determining a region of interest in the initial image; and determining a region of interest in each current image; wherein comparing each current image with the initial image refers to comparing a region of interest of each current image with a region of interest of the initial image.
Wherein the processing device is configured to: extracting at least one selected feature descriptor based on an image of a region of interest of the initial image; extracting at least one selected feature descriptor based on the image of the region of interest of each current image; and judging whether the deviation of the current image compared with the initial image reaches a set threshold value through a selected classifier by using the selected feature descriptors extracted from the initial image and each current image.
The invention can avoid poor image quality caused by the movement of the object to be detected and reduce the extra radiation dose born by the object to be detected due to repeated exposure.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail embodiments thereof with reference to the attached drawings in which:
fig. 1 is a schematic flow chart of an auxiliary positioning method of an X-ray medical apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic partial flow diagram of a method for assisted positioning of an X-ray medical device according to an embodiment of the invention.
FIG. 3 is a schematic block diagram of an auxiliary positioning system for an X-ray medical device according to an embodiment of the present invention.
Wherein the reference numbers are as follows:
auxiliary positioning method of 100X-ray medical equipment
S110-S130, S121-S123 steps
Auxiliary positioning system of 300X-ray medical equipment
310 collecting device
320 comparing device
330 prompting device
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled.
In this document, "a" or "an" means not only "but also" more than one ".
Referring first to fig. 1, fig. 1 is a schematic flow chart of an auxiliary positioning method of an X-ray medical apparatus according to an embodiment of the present invention. As shown, the method 100 includes the steps of:
step S110: acquiring an initial image of the object to be detected after the object to be detected is placed by utilizing a visible light image pick-up device;
step S120: acquiring current images of an object to be detected in real time, and comparing each current image with an initial image;
step S130: when the deviation of the current image and the initial image at a certain moment reaches a set threshold value, providing prompt information.
After instructing the object to be measured to complete the positioning, the physician often needs to return to the control room to operate the apparatus to complete the exposure and photography. In practice, the physician can select whether to activate the auxiliary positioning method of the X-ray medical equipment according to the needs.
According to the method 100, an initial image of the object to be measured after the object is placed is first captured by a visible light image capturing device (e.g., a camera) (step S110), and the initial image is saved as a reference image for subsequent image processing.
The method includes acquiring current images of the object to be measured in real time using a visible light image photographing device, and comparing each of the current images with an initial image (S120). In practice, the comparison of the two images can be achieved using a variety of image processing methods depending on the application requirements. Specifically, the image processing method mainly includes: background subtraction, frame difference, optical flow, Gaussian mixture model, self-organizing background detection, and VIBE. For the illumination change scene, a method with better robustness to illumination, such as a self-organizing background detection algorithm, can be adopted. A person skilled in the art can select a suitable image processing method by comprehensively considering the precision and the operation efficiency according to different scenes and different application requirements, and the invention is not limited in this respect.
In an embodiment, for example, the pixel value or the pixel difference value may be used as a selected parameter, i.e., a comparison object for determining the magnitude of the image deviation. Different set thresholds are set according to different organs, such as hands, legs, spine, chest, breasts and the like. In a variation, the selected parameter may be a preset certain or certain "feature", and the "feature" may be set according to the acquired image, for example, the color of the clothing of the object to be measured, and the invention is not limited thereto.
Referring to fig. 2 in combination, fig. 2 is a schematic partial flow chart of an auxiliary positioning method of an X-ray medical device according to an embodiment of the invention. In a preferred embodiment, the method 100 may further comprise the steps of:
step S121: determining a region of interest in the initial image;
step S122: determining a region of interest in each current image;
step S123: comparing each current image to the initial image refers to comparing a region of interest of each current image to a region of interest of the initial image.
To increase the operation speed, regions of interest may be determined in the initial image and the current image, respectively (step S121 and step S122), and the region of interest of the initial image may be compared with the region of interest of each current image to determine whether there is motion (step S123). In practice, the region of interest may be an exposure region, a selected region containing the exposure region preset with a redundant space, or a portion of the exposure region, and the present invention is not limited in this respect. How to determine the region of interest in the image is not the main improvement of the present invention, and is not described herein.
Preferably, comparing each current image with the initial image may comprise: extracting at least one selected feature descriptor based on an image of a region of interest of the initial image; extracting at least one selected feature descriptor based on the image of the region of interest of each current image; and judging whether the deviation of the current image compared with the initial image reaches a set threshold value through a selected classifier by using the selected feature descriptors extracted from the initial image and each current image. In other words, according to the selected features, the classifier is selected to determine the deviation between the images based on the feature descriptor corresponding to the selected features. In practice, for example, Histogram of Oriented Gradients (HOG) may be used as a feature descriptor, and a Support Vector Machine (SVM) may be used as a classifier, but the invention is not limited thereto. Moreover, a person skilled in the art can choose to set up a plurality of feature descriptors according to the actual application field.
When the deviation between the current image and the initial image at a certain time reaches a set threshold, a prompt message is provided (step S130). In an embodiment, a person skilled in the art may select parameters according to the selected image processing method, and set the threshold value based on the organ of the object to be detected. In other words, the set threshold is determined by the organ of the object to be measured or is manually input. For example, the set threshold may be determined automatically by the physician in practice by selecting the organ, or may be manually entered by the physician, as the present invention is not limited in this respect.
In an embodiment, the set threshold may comprise at least one preset value. Further, at least one preset value may be made to fall between the intervals [ -1, 1] via the normalization process. In practice, a plurality of preset values can be selected and set according to the actual application requirements to distinguish different motion states. For example, N preset values may be set, so as to distinguish N +1 motion states, and if more precise division is required, the number of the preset values may be increased. For example, by setting a preset value, two states of no movement of the object to be measured and movement of the object to be measured after the positioning can be distinguished. By setting two preset values, three states that the object to be detected does not move after being placed, the object to be detected can be exposed even if the object to be detected moves slightly, and the object to be detected can not be exposed even if the object to be detected moves greatly can be distinguished.
The invention can measure whether the object to be measured moves after being placed according to the deviation between the images, and when the movement is detected, prompt information can be provided in the forms of popping up a prompt dialog box and the like through a human-computer interaction interface of the X-ray medical equipment. In other embodiments, the prompt message may be provided by a light, a prompt tone, or the like. For example, taking the case of distinguishing the three states as an example, when the object to be detected does not move after being placed, a doctor can be prompted by a green prompt lamp; when the object to be detected moves slightly but still can be exposed, a yellow indicator light can be switched to prompt a doctor; when the object to be detected has large movement and can not be exposed, the red indicator light can be switched to prompt a doctor. After receiving the prompt message, the doctor can choose whether to continue to operate or re-guide the object to be tested to perform positioning. In practice, if a physician desires to obtain an auxiliary positioning method with higher sensitivity, the set threshold value can be adjusted accordingly, for example, by manually inputting.
Referring to fig. 2, fig. 2 is a schematic partial flow chart of an auxiliary positioning method of an X-ray medical device according to an embodiment of the invention. In a preferred embodiment, the method 100 may further comprise the steps of:
step S121: determining a region of interest in the initial image;
step S122: determining a region of interest in each current image;
step S123: comparing each current image to the initial image refers to comparing a region of interest of each current image to a region of interest of the initial image.
To increase the operation speed, regions of interest may be determined in the initial image and the current image, respectively (step S121 and step S122), and the region of interest of the initial image may be compared with the region of interest of each current image to determine whether there is motion (step S123). In practice, the region of interest may be an exposure region, a selected region containing the exposure region preset with a redundant space, or a portion of the exposure region, and the present invention is not limited in this respect. How to determine the region of interest in the image is not the main improvement of the present invention, and is not described herein.
In an embodiment, the visible light image capturing device may be provided to a beam splitter of the X-ray medical apparatus. The invention is not limited thereto, and the position of the camera can be adjusted by those skilled in the art according to the needs, for example, the camera can be arranged on other parts of the X-ray medical equipment or on the wall or roof of the examination room.
In an embodiment, the assisted positioning method 100 of an X-ray medical device can be performed in stages, wherein the stages are selected from at least one of the following stages: a preparation stage before starting exposure; the exposure phase after exposure is started. In other words, the motion detection may be performed before the start of the exposure, during the exposure, or throughout both stages. For example, in an exposure process in which the examination time is long, such as a breast examination, it may be difficult for the patient to maintain an effective posture for a long time or to move due to somatosensory discomfort caused by the examination. In this way, the method 100 can play a role of assisting the positioning.
In further embodiments, the set thresholds for the preparation phase and the exposure phase may be the same, or the set thresholds for the preparation phase and the exposure phase may be different. In other words, different thresholds may be set for different phases. For example, a relatively loose threshold may be set in the preparation stage, and a relatively strict threshold may be set in the exposure stage, so that a physician may be prompted if the object to be measured has less motion during the exposure process, thereby better avoiding motion artifacts in the obtained image, which is not limited by the present invention.
The present invention also provides an auxiliary positioning system for an X-ray medical device, as described below in conjunction with fig. 3. Referring to fig. 3, fig. 3 is a schematic block diagram of an auxiliary positioning system of an X-ray medical apparatus according to an embodiment of the present invention. As shown, the auxiliary positioning system 300 of the X-ray medical equipment includes an acquisition device 310, a comparison device 320 and a prompt device 330. The acquisition device 310 is used for acquiring an initial image of the object to be detected after the object to be detected is placed and acquiring a current image of the object to be detected in real time; the comparison means 320 is used to compare each current image with the initial image; the prompting device 330 is used for providing prompting information when the deviation of the current image and the initial image at a certain moment reaches a set threshold value.
In one embodiment, the auxiliary positioning system 300 of the X-ray medical apparatus may further include a processing device (not shown) for: a region of interest is determined in the initial image and a region of interest is determined in each of the current images. Wherein comparing each current image with the initial image refers to comparing a region of interest of each current image with a region of interest of the initial image.
In one embodiment, the processing device is configured to: extracting at least one selected feature descriptor based on an image of a region of interest of the initial image; extracting at least one selected feature descriptor based on the image of the region of interest of each current image; and judging whether the deviation of the current image compared with the initial image reaches a set threshold value through a selected classifier by using the selected feature descriptors extracted from the initial image and each current image.
In one embodiment, the set threshold may include at least one preset value. Further, said at least one preset value falls between the intervals [ -1, 1 ].
In an embodiment, the treatment device is adapted to perform the treatment in stages, wherein the stages are selected from at least one of the following stages: a preparation stage before starting exposure; and an exposure phase after the exposure is started.
In one embodiment, the set threshold values of the preparation phase and the exposure phase are the same; or the set threshold values of the preparation phase and the exposure phase are different.
In one embodiment, the set threshold is determined by the organ of the subject or is manually input.
Furthermore, the present invention also provides a computer storage medium having stored therein program instructions executable to implement any of the methods described above, while the foregoing methods may be applied to any of the medical devices disclosed herein. Specifically, a system or an apparatus equipped with a storage medium on which a software program code that realizes the functions of any one of the above-described embodiments is stored may be provided, and a computer (or a CPU or MPU) of the system or the apparatus is caused to read out and execute the program code stored in the storage medium.
In this case, the program code itself read from the storage medium can realize the functions of any of the above-described embodiments, and thus the program code and the storage medium storing the program code constitute a part of the present invention.
Examples of the storage medium for supplying the program code include a floppy disk, a hard disk, a magneto-optical disk, an optical disk (e.g., CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW), a magnetic tape, a nonvolatile memory card, and a ROM. Alternatively, the program code may be downloaded from a server computer by a communications network.
Further, it should be clear that the functions of any of the above-described embodiments can be implemented not only by executing the program code read out by the computer, but also by causing an operating system or the like operating on the computer to perform a part or all of the actual operations based on instructions of the program code.
Further, it is understood that the functions of any of the above-described embodiments are implemented by writing the program code read out from the storage medium into a memory provided in an expansion board inserted into the computer or into a memory provided in an expansion unit connected to the computer, and then causing an arithmetic unit such as a CPU mounted on the expansion board or the expansion unit to perform part or all of the actual operations based on the instructions of the program code.
The invention relates to an auxiliary positioning method and system for X-ray medical equipment and a computer storage medium. According to one embodiment, a method of assisted positioning of an X-ray medical device comprises: acquiring an initial image of the object to be detected after the object to be detected is placed by utilizing a visible light image pick-up device; acquiring current images of an object to be detected in real time, and comparing each current image with the initial image; and when the deviation of the current image and the initial image at a certain moment reaches a set threshold value, providing prompt information. The invention can avoid poor image quality caused by the movement of the object to be detected and reduce the extra radiation dose born by the object to be detected due to repeated exposure.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. An assisted positioning method of an X-ray medical device, comprising:
acquiring an initial image of the object to be detected after the object to be detected is placed by utilizing a visible light image pick-up device;
acquiring current images of an object to be detected in real time, and comparing each current image with the initial image; and
and providing prompt information when the deviation of the current image and the initial image at a certain moment reaches a set threshold value.
2. The assisted positioning method of an X-ray medical device of claim 1, further comprising:
determining a region of interest in the initial image; and
determining a region of interest in each current image;
wherein comparing each current image with the initial image refers to comparing a region of interest of each current image with a region of interest of the initial image.
3. The assisted positioning method of an X-ray medical device of claim 2, wherein comparing each current image to an initial image comprises:
extracting at least one selected feature descriptor based on an image of a region of interest of the initial image;
extracting at least one selected feature descriptor based on the image of the region of interest of each current image;
and judging whether the deviation of the current image compared with the initial image reaches a set threshold value through a selected classifier by using the selected feature descriptors extracted from the initial image and each current image.
4. The assisted positioning method of an X-ray medical device according to claim 1, wherein the set threshold comprises at least one preset value.
5. The assisted positioning method of an X-ray medical device according to claim 4, wherein said at least one preset value falls between the intervals [ -1, 1 ].
6. The assisted positioning method of an X-ray medical device according to claim 1, which can be performed in stages, wherein the stages are selected from at least one of the following stages:
a preparation stage before starting exposure; and
the exposure phase after exposure is started.
7. The method of assisted positioning of an X-ray medical device of claim 6, wherein
The set threshold values of the preparation stage and the exposure stage are the same; or
The set threshold values of the preparation phase and the exposure phase are different.
8. The assisted placement method of an X-ray medical device according to any of claims 1-7, wherein said set threshold is determined by an organ of said object to be tested or is manually entered.
9. A computer storage medium having stored therein program instructions executable to implement the method of any one of claims 1-8.
10. An assisted positioning system for an X-ray medical device, comprising:
the acquisition device is used for acquiring an initial image of the object to be detected after the object to be detected is placed and acquiring a current image of the object to be detected in real time;
a comparison means for comparing each current image with the initial image; and
and the prompting device is used for providing prompting information when the deviation of the current image and the initial image at a certain moment reaches a set threshold value.
11. The assisted positioning system of an X-ray medical device of claim 10, further comprising a processing device for:
determining a region of interest in the initial image; and
determining a region of interest in each current image;
wherein comparing each current image with the initial image refers to comparing a region of interest of each current image with a region of interest of the initial image.
12. The assisted positioning system of an X-ray medical device of claim 11, wherein the processing means is configured to:
extracting at least one selected feature descriptor based on an image of a region of interest of the initial image;
extracting at least one selected feature descriptor based on the image of the region of interest of each current image;
and judging whether the deviation of the current image compared with the initial image reaches a set threshold value through a selected classifier by using the selected feature descriptors extracted from the initial image and each current image.
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| CN113827266A (en) * | 2021-10-13 | 2021-12-24 | 上海奕瑞光电子科技股份有限公司 | Intraoral imaging system |
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