A child examination fixing device suitable for PET / MRI and an application method thereof

Abstract

The application discloses to the technical field of medical image scanning auxiliary equipment, in particular to a kind of children examination fixing device suitable for PET / MRI and application method thereof, including: bed body and fixed support, the fixed support is set above bed body;Fixed support includes: first fixed main frame, second fixed main frame, first adjusting frame, second adjusting frame and third adjusting frame, first / second fixed main frame is fixed above bed body by first / second height adjusting buckle, height is adjustable;First / second / third adjusting frame is fixed on the first fixed main frame by first / second / third up-down adjusting buckle, can move up and down along the first fixed main frame;Two ends of first / second / third adjusting frame are fixed above bed body by first / second / third left-right adjusting buckle, length is adjustable. It can be adjusted in place at a time by setting adjusting buckle structure when children lie on bed body, save the time wasted by multiple adjustments, also avoid the harm that mechanical movement can cause to children.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of medical image scanning auxiliary equipment, in particular to a child examination fixing device suitable for PET / MRI and an application method thereof. BACKGROUND

[0002] MRI (Magnetic resonance imaging) is a medical imaging technique used in radiology to form pictures of the anatomy and physiological processes of the human body, and PET (Positron emission Tomography) is a nuclear imaging technique that can show metabolic processes in the body. In the medical field, PET / MRI images are used to scan specific parts of patients to show whether they have a disease, which is a widely used technology. During the scanning process, the patient needs to cooperate to remain stationary to facilitate the scanning of the instrument and obtain accurate scanning data. For adults, it may not be difficult to cooperate with the instrument scanning according to the doctor's instructions, but for children, especially younger children or children who are not very comfortable, it is difficult to keep them stationary for examination. In the prior art, the child needs to be anesthetized before scanning, or the child needs to be tied to a fixing device by a doctor, which greatly increases the workload of the doctor, and improper anesthesia or tying method can also cause harm to the child.

[0003] Therefore, those skilled in the art urgently need to develop a new technical solution to solve the above problems. SUMMARY

[0004] To overcome the problems in the related art, the present disclosure provides a child examination fixing device suitable for PET / MRI and an application method thereof.

[0005] According to a first aspect of the embodiments of the present disclosure, a child examination fixing device suitable for PET / MRI is provided, which comprises a bed body and a fixing support, wherein the fixing support is arranged above the bed body.

[0006] The fixing support comprises a first fixing main frame, a second fixing main frame, a first adjusting frame, a second adjusting frame and a third adjusting frame, both ends of the first fixing main frame are fixed above the bed body through first height adjusting buckles, both ends of the second fixing main frame are fixed above the bed body through second height adjusting buckles, the height of the first fixing main frame and the second fixing main frame is adjustable, the first fixing main frame and the second fixing main frame are in a cross shape, the first fixing main frame is located at the central axis position of the bed body and is parallel to the length direction of the bed body.

[0007] The first adjusting frame is fixed on the first fixed main frame through a first up-down adjusting buckle, the second adjusting frame is fixed on the first fixed main frame through a second up-down adjusting buckle, and the third adjusting frame is fixed on the first fixed main frame through a third up-down adjusting buckle, so that the first adjusting frame, the second adjusting frame and the third adjusting frame can move up and down along the first fixed main frame.

[0008] The two ends of the first adjusting frame are fixed above the bed body through a first left-right adjusting buckle, the two ends of the second adjusting frame are fixed above the bed body through a second left-right adjusting buckle, and the two ends of the third adjusting frame are fixed above the bed body through a third left-right adjusting buckle, so that the lengths of the first adjusting frame, the second adjusting frame and the third adjusting frame are adjustable.

[0009] Optionally, the device further comprises a controller.

[0010] The controller is electrically connected with the first height adjusting buckle, the second height adjusting buckle, the first up-down adjusting buckle, the second up-down adjusting buckle, the third up-down adjusting buckle, the first left-right adjusting buckle, the second left-right adjusting buckle and the third left-right adjusting buckle respectively, and is used for controlling the first height adjusting buckle, the second height adjusting buckle, the first up-down adjusting buckle, the second up-down adjusting buckle, the third up-down adjusting buckle, the first left-right adjusting buckle, the second left-right adjusting buckle and the third left-right adjusting buckle to automatically adjust.

[0011] Optionally, the device further comprises a camera, which is electrically connected with the controller and is used for collecting image data of the child patient and sending the image data to the controller.

[0012] The controller is used for analyzing the image data, obtaining body data of the child patient, and controlling the first height adjusting buckle, the second height adjusting buckle, the first up-down adjusting buckle, the second up-down adjusting buckle, the third up-down adjusting buckle, the first left-right adjusting buckle, the second left-right adjusting buckle and the third left-right adjusting buckle to automatically adjust according to the body data.

[0013] Optionally, the camera comprises a first camera and a second camera, and the first camera and the second camera are horizontally aligned.

[0014] When the child patient stands at a position between the first camera and the second camera and faces the first camera or the second camera, first image data B ij of the child patient is collected through the first camera, and second image data D ij of the child patient is collected through the second camera.

[0015] According to the first image data B ij and the second image data D ijThe 3D depth matrix of the pediatric patient is determined to be (A ij -B ij )+(E ij -F ij )-K, where A ij C is the third image data captured by the first camera when there are no child patients. ij The fourth image data acquired by the second camera when there are no pediatric patients; E ij C ij The flip matrix, F ij D ij The flip matrix is ​​given by K, where K is the distance between the first and second cameras.

[0016] Optionally, the camera includes: a top camera;

[0017] When the child patient is lying under the top camera, the fifth data image G of the child patient is captured by the top camera. ij According to the fifth data image G ij The 3D depth matrix of the pediatric patient is determined to be (G ij -H ij ), where H ij The sixth image data is captured by the first camera when there are no child patients.

[0018] Optionally, airbags are provided inside the first fixed main frame, the second fixed main frame, the first adjusting frame, the second adjusting frame, and the third adjusting frame.

[0019] Optionally, the air pressure inside the airbag is (30+yr*2) mmHg, where yr is the age of the child patient.

[0020] Optionally, the device further includes a projector for projecting an image toward the direction in which the child patient's face is facing, in order to attract the child patient's attention during the process of the camera acquiring image data of the child patient.

[0021] Optionally, the first fixed main frame, the second fixed main frame, the first adjusting frame, the second adjusting frame, and the third adjusting frame are made of carbon fiber composite material.

[0022] According to a second aspect of the disclosed embodiments of the present invention, a method for applying a pediatric examination fixation device suitable for PET / MRI is provided, which is applied to the pediatric examination fixation device suitable for PET / MRI described in the first aspect of the disclosed embodiments of the present invention, the method comprising:

[0023] acquire image data of a child patient, determine target positions to which a first height adjusting buckle, a second height adjusting buckle, a first up-down adjusting buckle, a second up-down adjusting buckle, a third up-down adjusting buckle, a first left-right adjusting buckle, a second left-right adjusting buckle and a third left-right adjusting buckle in the child examination fixing device need to be adjusted according to the image data;

[0024] adjust the first height adjusting buckle, the second height adjusting buckle, the first up-down adjusting buckle, the second up-down adjusting buckle, the third up-down adjusting buckle, the first left-right adjusting buckle, the second left-right adjusting buckle and the third left-right adjusting buckle according to the target positions, so that the child patient is fixed on a bed body of the child examination fixing device for examination.

[0025] Therefore, the technical scheme in the embodiment disclosed by the present application can bring the following beneficial effects:

[0026] (1) By arranging the fixing device containing the adjusting buckle structure, the fixing device can be adjusted in place at one time when the child patient lies on the bed body, the time wasted by multiple adjustments is saved, and the harm that the mechanical movement may cause to the child is avoided;

[0027] (2) The image data of the child patient collected by the camera is analyzed by the controller to obtain the body data, and the adjusting buckle is automatically adjusted according to the body data, so that the workload of the doctor is reduced, and the automatic correction function can make the fixing device suitable for children of various ages;

[0028] (3) The light fixing frame made of carbon fiber material is convenient for the doctor to take and place, and does not interfere with the magnetic scanning process.

[0029] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following specific embodiments to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0031] Figure 1 is a structural schematic view of a child examination fixing device suitable for PET / MRI according to an exemplary embodiment;

[0032] Figure 2 is a structural schematic view of a child examination fixing device bed body according to Figure 1 is a structural schematic view of a child examination fixing device bed body according to

[0033] Figure 3 is a structural schematic view of a child examination fixing device bed body according to Figure 1 is a schematic view of image data collected by a camera when a child stands.

[0034] Figure 4 is according to Figure 1 a schematic diagram showing a camera collecting image data of a child in a lying position;

[0035] Figure 5 is according to Figure 1 a schematic diagram showing important parameters of body data of a child;

[0036] Figure 6 is according to Figure 5 a schematic diagram showing another important parameter of body data of a child;

[0037] Figure 7 is a flow chart showing a method of applying a child examination fixing device for PET / MRI according to an exemplary embodiment. DETAILED DESCRIPTION

[0038] The specific embodiments of the present disclosure disclosed herein are described in connection with the appended drawings. It is to be understood that the descriptions of specific embodiments are intended to be illustrative only and are not intended to be limiting to the scope of the present disclosure.

[0039] As Figure 1 and Figure 2As shown, the device includes a bed frame 110 and a fixed bracket, which is positioned above the bed frame. The fixed bracket includes a first fixed main frame 121, a second fixed main frame 122, a first adjusting frame 123, a second adjusting frame 124, and a third adjusting frame 125. The two ends of the first fixed main frame 121 are fixed above the bed frame via a first height adjusting buckle 131, and the two ends of the second fixed main frame 122 are fixed above the bed frame 110 via a second height adjusting buckle 132. The heights of the first and second fixed main frames 121 and 122 are adjustable. The first and second fixed main frames 121 and 122 intersect in a cross shape. The first fixed main frame 121 is located at the central axis of the bed frame, parallel to the length direction of the bed frame. The first adjusting frame 123 is fixed above the bed frame via a first height adjusting buckle 133. On the first fixed main frame 121, the second adjusting frame 124 is fixed to the first fixed main frame 121 by the second up-down adjusting buckle 134, and the third adjusting frame 125 is fixed to the first fixed main frame 121 by the third up-down adjusting buckle 135, so that the first adjusting frame 123, the second adjusting frame 124 and the third adjusting frame 125 can move up and down along the first fixed main frame 121; the two ends of the first adjusting frame 123 are fixed above the bed frame 110 by the first left-right adjusting buckle 136, the two ends of the second adjusting frame 124 are fixed above the bed frame 110 by the second left-right adjusting buckle 137, and the two ends of the third adjusting frame 125 are fixed above the bed frame 110 by the third left-right adjusting buckle 138, so that the length of the first adjusting frame 123, the second adjusting frame 124 and the third adjusting frame 125 is adjustable.

[0040] For example, this invention discloses a pediatric fixation device suitable for PET / MRI examinations. Before a pediatric patient enters the CT or MRI room, the patient is secured to this device to prevent non-cooperation during the examination and ensure accurate results. The device includes a bed and a fixation frame. The pediatric patient lies on a pillow on the bed, and the fixation frame keeps the patient immobile during the CT or MRI scan.

[0041] like Figure 2 As shown, the bed frame 110 includes four mounting holes 210, which are used to install and fix the first height adjustment buckles 131 at both ends of the first fixed main frame 121, and the second height adjustment buckles 132 at both ends of the second fixed main frame 122, respectively. The first height adjustment buckles 131 and the second height adjustment buckles 132 can fix the first fixed main frame 121 and the second fixed main frame 122 to the bed frame 110, respectively. The heights of the first height adjustment buckles 131 and the second height adjustment buckles 132 are adjustable to adjust the sagittal plane thickness.

[0042] The first fixed main frame 121 and the second fixed main frame 122 form a cross main frame structure in a "plus" shape. Three "plus" shaped sub - frames, namely the first adjustment frame 123, the second adjustment frame 124, and the third adjustment frame 125, are fixed on the cross. The first adjustment frame 123 is used to fix the head of a child patient (it can be understood that the fixing position is at the patient's neck), the second adjustment frame 123 is used to fix the hand of a child patient (it can be understood that the fixing position is at the patient's arm), and the third adjustment frame 125 is used to fix the foot of a child patient (it can be understood that the fixing position is at the patient's calf). The three sub - frames can slide up and down along the cross to adjust according to the body data of different child patients. Further, the two vertical small plates at both ends of the "plus" shaped sub - frame can slide left and right along the sub - frame groove (realized by the first left - right adjustment buckle, the second left - right adjustment buckle, and the third left - right adjustment buckle) to adjust the length of the sub - frame, so that the sub - frame can adapt to child patients with different body data.

[0043] In a specific application scenario, the above adjustment buckles can be adjusted manually by medical staff: let the child patient lie on the bed with hands and feet together, align the mid - line of the child patient's body with the mid - line of the bed, then fix the first fixed main frame and the second fixed main frame on the fixed bed, and finally only need to finely adjust and fix other fixed frames and adjustment frames, and perform manual adjustment. Adjust each fixed support according to the body data of the child patient to reach a "relatively loose" state (usually leaving 2 cm more space in width and thickness than the actual body data of the child patient, and being consistent with the body data of the child patient in the vertical direction, without leaving extra space).

[0044] It can be understood that the first height adjustment buckle 131 and the second height adjustment buckle 132 can use commonly used buckles that can adjust height. For example, the buckle that can control the length and retraction in a utility knife can be used. The first up - down adjustment buckle 133, the second up - down adjustment buckle 134, the third up - down adjustment buckle 135, the first left - right adjustment buckle 136, the second left - right adjustment buckle 137, and the third left - right adjustment buckle 138 can use commonly used length adjustment buckles. For example, the buckles used to adjust the length in watchbands and belts can be used.

[0045] The first fixed main frame 121, the second fixed main frame 122, the first adjustment frame 123, the second adjustment frame 124, and the third adjustment frame 125 are made of carbon fiber composite materials. Carbon fiber composite materials have the characteristics of light weight and high strength, are not easy to cause harm to the body of child patients, and do not interfere with magnetic signals. They are ideal non - magnetic materials in PET / MRI equipment.

[0046] Optionally, the device further comprises a controller, which is electrically connected with the first height adjusting buckle 131, the second height adjusting buckle 132, the first up-down adjusting buckle 133, the second up-down adjusting buckle 134, the third up-down adjusting buckle 135, the first left-right adjusting buckle 136, the second left-right adjusting buckle 137 and the third left-right adjusting buckle 138 respectively, and is used for controlling the first height adjusting buckle 131, the second height adjusting buckle 132, the first up-down adjusting buckle 133, the second up-down adjusting buckle 134, the third up-down adjusting buckle 135, the first left-right adjusting buckle 136, the second left-right adjusting buckle 137 and the third left-right adjusting buckle 138 to automatically adjust.

[0047] For example, in another embodiment of the present disclosure, the first height adjusting buckle 131, the second height adjusting buckle 132, the first up-down adjusting buckle 133, the second up-down adjusting buckle 134, the third up-down adjusting buckle 135, the first left-right adjusting buckle 136, the second left-right adjusting buckle 137 and the third left-right adjusting buckle 138 can automatically adjust, and are controlled by the controller. When the child patient lies on the bed body, the controller automatically calculates the positions to which each adjusting buckle needs to be adjusted according to the body data of the child, so that the child patient is fixed on the bed body in a comfortable state.

[0048] In addition, an external controller can also be used. After the child patient is fixed by controlling each adjusting buckle, the external controller is detached, and then the bed body is pushed into the CT scanning room or the nuclear magnetic scanning room, so as to prevent the controller from containing materials that interfere with the magnetic signal.

[0049] Optionally, the device further comprises a camera, which is electrically connected with the controller and is used for collecting image data of the child patient and sending the image data to the controller; and the controller is used for analyzing the image data, obtaining body data of the child patient, and controlling the first height adjusting buckle 131, the second height adjusting buckle 132, the first up-down adjusting buckle 133, the second up-down adjusting buckle 134, the third up-down adjusting buckle 135, the first left-right adjusting buckle 136, the second left-right adjusting buckle 137 and the third left-right adjusting buckle 138 to automatically adjust according to the body data.

[0050] For example, the body data of the child patient can be obtained by analyzing the image data, and the image data is collected by the camera. After the controller analyzes the image data to obtain the body data, the first height adjusting buckle 131, the second height adjusting buckle 132, the first up-down adjusting buckle 133, the second up-down adjusting buckle 134, the third up-down adjusting buckle 135, the first left-right adjusting buckle 136, the second left-right adjusting buckle 137 and the third left-right adjusting buckle 138 are controlled according to the body data.

[0051] Optionally, the device may also include a projector for projecting an image toward the direction in which the child patient's face is facing, in order to attract the child patient's attention as the camera acquires image data of the child patient.

[0052] For example, the projector displays an image that aligns with the child patient's facial orientation. Once the child is positioned where the camera is capturing image data, the projector begins to display the image. The image is then converted into graphics for the child to perceive and adjust accordingly. The process of observing the projection itself also diverts the child's attention, which helps ensure the accuracy of the collected image data.

[0053] The camera includes a first camera and a second camera, which are horizontally aligned. When the child patient stands between the first and second cameras and faces either the first or second camera, the first image data B of the child patient is acquired through the first camera. ij The second image data of the child patient was acquired through the second camera. ij According to the first image data B ij Second image data D ij The 3D depth matrix of the pediatric patient was determined to be (A ij -B ij )+(E ij -F ij )-K, where A ij C is the third image data captured by the first camera when there are no pediatric patients. ij This is the fourth image data captured by the second camera when there are no pediatric patients; E ij C ij The flip matrix, F ij D ij The flip matrix is ​​given by K, where K is the distance between the first and second cameras.

[0054] For example, such as Figure 3 As shown, for pediatric patients who can stand on their own, two cameras (the first camera and the second camera) are set up with their horizontal central axis aligned. The pediatric patient stands between the two cameras, facing one of the cameras. At this time, the projection device starts to project the image in the direction the pediatric patient's face is facing, and at the same time, the two cameras capture the pediatric patient's data images.

[0055] In one embodiment of the present invention, the pixel matrix without pediatric patients acquired by the camera located on the left is A. ij The pixel matrix collected from pediatric patients is B. ij The pixel matrix without pediatric patients captured by the camera located on the right is C. ij, the pixel matrix of the child collected is D ij If the left camera is the main camera, the data collected by the right camera needs to be flipped around the midline of the two cameras to obtain E ij and F ij . Thus, the 3D depth matrix of the child patient is (A ij -B ij )+(E ij -F ij )-K, where K is the distance between the two cameras, and ij respectively correspond to the xy coordinates of the horizontal plane of the person.

[0056] Optionally, the camera comprises: a top camera; when the child patient lies below the top camera, the fifth data image G ij of the child patient is collected by the top camera, and the 3D depth matrix of the child patient is determined according to the fifth data image G ij (H ij -G ij ), where H ij is the sixth image data collected by the first camera without the child patient.

[0057] For example, as shown in Figure 4 , for children who cannot stand by themselves or have been anesthetized, a lying position can be used, that is, the child patient lies on the bed body, and the bed body is moved below the top camera, and two image data G ij and H ij of the child with and without the child are collected by the top camera, and the 3D depth matrix of the child is calculated according to the two image data.

[0058] It should be noted that, as shown in Figure 5 and Figure 6 , after obtaining the 3D depth matrix of the child, the controller calculates important parameters of the child in each direction according to the 3D depth matrix: the top of the head A, the top of the shoulder C, the center B of the top of the head and the top of the shoulder, the underarm D, the crotch E, the sole F, the widest part of the left side of the body L (in the state that the shoulder is naturally vertically placed), the widest part of the right side of the body N (in the state that the shoulder is naturally vertically placed), the center point M of the front of the human body, the leftmost side J of the side of the human body, and the last side K of the side of the human body. Each fixed support and adjusting frame is provided with a scale value, and the controller calculates the scale that needs to be adjusted for each fixed support or adjusting frame according to the important parameters.

[0059] In addition, the first fixed main frame, the second fixed main frame, the first adjusting frame, the second adjusting frame, and the third adjusting frame are internally provided with air bags. Optionally, the air pressure value inside the air bag is (30+yr*2) mmHg, where yr is the age of the child patient.

[0060] For example, if the child's posture needs to be strictly fixed, the inside air bag of the clamping plate is inflated to (30+age*2) mmHg air pressure to ensure stability, which is the lower limit of the diastolic pressure of the age, will not compress the blood vessels, and will not harm the child within a short period of time (longer than ten minutes).

[0061] Figure 7 A flow chart of a method for applying a child examination fixing device suitable for PET / MRI according to an exemplary embodiment is shown in FIG. 1. Figure 7 As shown in FIG. 1, the method for applying a child examination fixing device suitable for PET / MRI includes the following steps.

[0062] In step 701, image data of a child patient is acquired, and target positions to which first height adjustment buckles, second height adjustment buckles, first up-down adjustment buckles, second up-down adjustment buckles, third up-down adjustment buckles, first left-right adjustment buckles, second left-right adjustment buckles, and third left-right adjustment buckles of the child examination fixing device need to be adjusted are determined according to the image data.

[0063] In step 702, the first height adjustment buckles, the second height adjustment buckles, the first up-down adjustment buckles, the second up-down adjustment buckles, the third up-down adjustment buckles, the first left-right adjustment buckles, the second left-right adjustment buckles, and the third left-right adjustment buckles are adjusted according to the target positions, so that the child patient is fixed on a bed body of the child examination fixing device for examination.

[0064] In summary, the present disclosure relates to the technical field of medical image scanning auxiliary equipment, specifically to a child examination fixing device suitable for PET / MRI and a method for applying the same, which includes a bed body and a fixing support, and the fixing support is arranged above the bed body. The fixing support includes a first fixing main support, a second fixing main support, a first adjustment support, a second adjustment support, and a third adjustment support. The first / second fixing main support is fixed above the bed body through first / second height adjustment buckles and is height-adjustable. The first / second / third adjustment support is fixed on the first fixing main support through first / second / third up-down adjustment buckles and can move up and down along the first fixing main support. The two ends of the first / second / third adjustment support are fixed above the bed body through first / second / third left-right adjustment buckles and are length-adjustable. The adjustment buckle structure can be set, and the child can be adjusted to the right position at one time when lying on the bed body, which saves time wasted by multiple adjustments and avoids possible harm to the child caused by mechanical movement.

[0065] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0066] It should be further noted that various technical features described in the above specific embodiments can be combined in any suitable manner, and the disclosure is not limited to the combinations explicitly described herein, unless otherwise indicated.

[0067] Furthermore, various different embodiments of the disclosure can be combined in any suitable manner, as long as it does not deviate from the spirit of the disclosure, and it should be considered as disclosed by the disclosure.

Claims

1. A child examination fixation device suitable for PET / MRI, characterized in that, The device comprises a bed body and a fixed support arranged above the bed body; The fixed support comprises a first fixed main frame, a second fixed main frame, a first adjusting frame, a second adjusting frame and a third adjusting frame, both ends of the first fixed main frame are fixed above the bed body through first height adjusting buckles, both ends of the second fixed main frame are fixed above the bed body through second height adjusting buckles, the height of the first fixed main frame and the second fixed main frame is adjustable, the first fixed main frame and the second fixed main frame are crossed in a "cross" shape, the first fixed main frame is located at the central axis position of the bed body and is parallel to the length direction of the bed body; The first adjusting frame is fixed on the first fixed main frame through first up-down adjusting buckles, the second adjusting frame is fixed on the first fixed main frame through second up-down adjusting buckles, and the third adjusting frame is fixed on the first fixed main frame through third up-down adjusting buckles, so that the first adjusting frame, the second adjusting frame and the third adjusting frame can move up and down along the first fixed main frame; Both ends of the first adjusting frame are fixed above the bed body through first left-right adjusting buckles, both ends of the second adjusting frame are fixed above the bed body through second left-right adjusting buckles, and both ends of the third adjusting frame are fixed above the bed body through third left-right adjusting buckles, so that the length of the first adjusting frame, the second adjusting frame and the third adjusting frame is adjustable; The device further comprises a camera, the camera comprises a first camera and a second camera, and the first camera and the second camera are horizontally aligned; acquire first image data B of the child patient through the first camera when the child patient stands in a position between the first camera and the second camera and faces the first camera or the second camera ij acquire second image data D of the child patient through the second camera ij ; According to the first image data B ij and second image data D ij , the 3D depth matrix of the child patient is determined as (A ij -B ij )+(E ij -F ij )-K, wherein A ij is the third image data collected by the first camera without the child patient, C ij is the fourth image data collected by the second camera without the child patient; E ij is the inverse matrix of C ij , F ij is the inverse matrix of D ij , and K is the distance between the first camera and the second camera.

2. The child examination fixation device suitable for PET / MRI according to claim 1, characterized in that, The device further comprises a controller; The controller is electrically connected with the first height adjusting buckle, the second height adjusting buckle, the first up-down adjusting buckle, the second up-down adjusting buckle, the third up-down adjusting buckle, the first left-right adjusting buckle, the second left-right adjusting buckle and the third left-right adjusting buckle respectively, and is used for controlling the first height adjusting buckle, the second height adjusting buckle, the first up-down adjusting buckle, the second up-down adjusting buckle, the third up-down adjusting buckle, the first left-right adjusting buckle, the second left-right adjusting buckle and the third left-right adjusting buckle to automatically adjust.

3. The child examination fixation device suitable for PET / MRI according to claim 2, characterized in that, The camera is electrically connected with the controller, is used for collecting image data of a child patient, and sends the image data to the controller; The controller is used for analyzing the image data, obtaining body data of the child patient, and controlling the first height adjusting buckle, the second height adjusting buckle, the first up-down adjusting buckle, the second up-down adjusting buckle, the third up-down adjusting buckle, the first left-right adjusting buckle, the second left-right adjusting buckle and the third left-right adjusting buckle to automatically adjust according to the body data.

4. The child examination fixation device suitable for PET / MRI of claim 1, wherein, The camera comprises a top camera; acquiring a fifth data image G of the child patient by the top camera when the child patient lies under the top camera ij determining a 3D depth matrix of the child patient as (G ij -H ij ) from the fifth data image G ij , wherein H ij is a sixth image data acquired by the first camera without the child patient.

5. The child examination fixation device suitable for PET / MRI of claim 1, wherein, The first fixed main frame, the second fixed main frame, the first adjusting frame, the second adjusting frame and the third adjusting frame are internally provided with air bags.

6. The child examination fixation device suitable for PET / MRI according to claim 5, characterized in that, The air pressure value in the air bag is (30+yr*2) mmHg, wherein yr is the age of the child patient.

7. The child examination fixation device suitable for PET / MRI of claim 1, wherein, The device further comprises a projector, which is used for projecting a picture to the direction in which the face of the child patient is directed, so as to attract the attention of the child patient in the process of collecting image data of the child patient by the camera.

8. The child examination fixation device suitable for PET / MRI of claim 1, wherein, The first fixed main frame, the second fixed main frame, the first adjusting frame, the second adjusting frame and the third adjusting frame are made of carbon fiber composite material.

9. A method of applying a child examination fixation device suitable for PET / MRI, characterized in that, The method is applied to the child examination fixing device suitable for PET / MRI in any one of claims 1-8, and the method comprises: Image data of a child patient is acquired, target positions at which first height adjusting buckles, second height adjusting buckles, first up-down adjusting buckles, second up-down adjusting buckles, third up-down adjusting buckles, first left-right adjusting buckles, second left-right adjusting buckles and third left-right adjusting buckles in the child examination fixing device need to be adjusted are determined according to the image data; The first height adjusting buckles, the second height adjusting buckles, the first up-down adjusting buckles, the second up-down adjusting buckles, the third up-down adjusting buckles, the first left-right adjusting buckles, the second left-right adjusting buckles and the third left-right adjusting buckles are adjusted according to the target positions, so that the child patient is fixed on a bed body of the child examination fixing device for examination.

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