CT-MRI (computed tomography-magnetic resonance imaging) same-position radiotherapy simulation positioning device

Abstract

The CT-MRI same-body-position radiotherapy simulation positioning device comprises a headrest, a first positioning piece and a body position fixing plate, the headrest is detachably connected with the first positioning piece, the first positioning piece is fixed to the center of the front face of the body position fixing plate, and the first positioning piece is detachably connected with the body position fixing plate. The front face of the body position fixing plate is a plane, the back face of the body position fixing plate is provided with an adapter, and the adapter is matched with the bottom face of a head and neck combined coil used on the nuclear magnetic resonance scanner and is in face fit with the bottom face of the head and neck combined coil. According to the utility model, the body position consistency of the CT image and the MRI image is improved when the CT image and the MRI image are acquired, so that the registration fusion effect of the MRI image and the CT image is more excellent, the accuracy of target area sketching is improved, and the radiotherapy effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to a CT-MRI same-position radiotherapy simulation positioning device. Background Art

[0002] Tumor radiotherapy is a local treatment method that uses radiation to treat tumors. It requires precise positioning and delineation of the location and size of the tumor target area. Among them, currently, CT (Computed Tomography) images, MRI (Magnetic Resonance Imaging) images, and image registration and fusion techniques are usually used to improve the accuracy of target area delineation.

[0003] However, the surface structures of the patient when scanning to generate CT images on a CT simulation locator and when scanning to generate MRI images on a nuclear magnetic resonance scanner are different, resulting in different patient postures, thus affecting the accuracy of target area delineation. Summary of the Utility Model

[0004] In order to solve the above problems of the prior art, the utility model provides a CT-MRI same-position radiotherapy simulation positioning device, which can improve the accuracy of target area delineation.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] In a first aspect, the utility model provides a CT-MRI same-position radiotherapy simulation positioning device, including a headrest, a first positioning member, and a body position fixing plate. The headrest is detachably connected to the first positioning member. The first positioning member is fixed at the center position on the front surface of the body position fixing plate. The front surface of the body position fixing plate is a plane, and an adapter is arranged on the back surface. The adapter is adapted to the bottom surface of the head and neck combined coil used on a nuclear magnetic resonance scanner and is in surface contact.

[0007] The beneficial effect of the utility model lies in that: the adapter is used to fit with the bottom surface of the head and neck combined coil used on a nuclear magnetic resonance scanner, so that the upper surface of the body position fixing plate is horizontally arranged. In this way, it is the same plane environment as the body position placing plate when the patient lies down when obtaining CT images, thereby improving the body position consistency when obtaining CT images and MRI images, so that the registration and fusion effect of MRI images and CT images is better, thereby improving the accuracy of target area delineation and improving the radiotherapy effect.

[0008] Optionally, a spirit level is arranged on the front surface of the body position fixing plate, and a water column is embedded in the center position on the back surface of the body position fixing plate. When the headrest is connected to the first positioning member in a matching manner, the central axis of the water column coincides with the central axis of the headrest in the vertical projection.

[0009] According to the above description, a spirit level is used to ensure that the body position fixing plate is placed horizontally, thereby creating a plane environment identical to the body position placing plate. The verticality of the water column in the scanning and positioning image is used to ensure the horizontal perpendicularity of the tomographic scanning line, thereby further improving the registration and fusion effect of MRI images and CT images.

[0010] Optionally, it further includes a second positioning member and a U-shaped head mold. The headrest is detachably connected to the second positioning member. The second positioning member has the same structure as the first positioning member. The second positioning member is fixed on the body position placing plate of the CT simulation locator. The U-shaped head mold is detachably connected to the body position fixing plate and the body position placing plate, and the connection positions correspond one by one. Both the headrest and the U-shaped head mold are thermoplastic shaping parts. The headrest is shaped by the patient lying on the thermoplastic material above the second positioning member. The U-shaped head mold is shaped by stretching the thermoplastic film downward from the face of the patient lying on the headrest and fixing it on the body position placing plate.

[0011] According to the above description, both the body position placing plate and the body position fixing plate of the CT simulation locator are provided with a headrest and a U-shaped head mold for fixing the patient's body position, so that the body positions during the acquisition of CT images and MRI images are kept consistent, so as to further improve the accuracy of target area delineation and improve the radiotherapy effect.

[0012] Optionally, both the second positioning member and the first positioning member are positioning blocks imitating the neck and head curves.

[0013] Optionally, the coverage area of the U-shaped head mold ranges from the head to the shoulders, and its edge size matches that of the body position fixing plate.

[0014] According to the above description, the coverage area of the U-shaped head mold ranges from the head to the shoulders to fix the upper body area of the patient as much as possible, so that the body positions during the acquisition of CT images and MRI images are kept consistent.

[0015] Optionally, a plurality of fixing holes are distributed on the edge of the U-shaped head mold, and a buckle member is arranged in the fixing holes. The buckle member is used for detachable connection with the body position fixing plate and the body position placing plate.

[0016] Optionally, a first positioning plate is arranged below the second positioning member, and a second positioning plate is arranged below the first positioning member. The second positioning member is fixed on the body position placing plate of the CT simulation locator through the first positioning plate, and the first positioning member is fixed at the center position on the front surface of the body position fixing plate through the second positioning plate;

[0017] The detachable connection between the U-shaped head mold and the body position fixing plate and the body position placing plate is replaced with: the detachable connection between the U-shaped head mold and the first positioning plate and the second positioning plate;

[0018] The detachable connection of the buckle member with the body position fixing plate and the body position placing plate is replaced with: the detachable connection of the buckle member with the first positioning plate and the second positioning plate.

[0019] Optionally, the body position fixing plate is detachably connected to the adapter fitting.

[0020] Optionally, the adapter fitting is arranged on the back surface of the body position fixing plate corresponding to the first positioning member, and a support member is further arranged in the area of the back surface of the body position fixing plate extending outside the head and neck combined coil.

[0021] Optionally, the body position fixing plate is an ABS plastic part. Description of the Drawings

[0022] Figure 1 Is a three-dimensional schematic diagram of the U-shaped head mold, the second positioning member and the adapter fitting related to the embodiment of the present invention;

[0023] Figure 2 Is a schematic diagram of the back surface of the body position fixing plate related to the embodiment of the present invention;

[0024] Figure 3 Is a schematic diagram of the cooperation between the second positioning member and the body position placing plate related to the embodiment of the present invention;

[0025] Figure 4 Is a three-dimensional schematic diagram of the headrest, the second positioning member, the U-shaped head mold and the body position placing plate related to the embodiment of the present invention;

[0026] Figure 5 Is a schematic diagram of the scanning positioning image related to the embodiment of the present invention;

[0027] Figure 6 Is another implementation scheme of the U-shaped head mold related to the embodiment of the present invention;

[0028] Figure 7 Is a comparison schematic diagram of the CT image and the MRI image obtained in the embodiment of the present invention;

[0029] Figure 8 Is a comparison schematic diagram of the CT image and the MRI image obtained by the prior art.

[0030]

Description of the Reference Numerals

[0031] 1. Headrest;

[0032] 2. Second positioning member; 21. First positioning plate; 22. Mounting hole;

[0033] 3. U-shaped head mold; 31. Fixing hole;

[0034] 4. Body position fixing plate; 41. Level gauge; 42. Water column;

[0035] 5. Adaptor;

[0036] 6. First positioning member; 61. Second positioning plate;

[0037] 7. Support member;

[0038] 100. Body position placement plate. Detailed implementation mode

[0039] In order to better understand the above technical solution, the exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to convey the scope of the present invention completely to those skilled in the art.

[0040] Embodiment 1

[0041] Please refer to Figures 1 to 7 , a CT-MRI same body position radiotherapy simulation positioning device, including a headrest 1, a second positioning member 2, a first positioning member 6, a U-shaped head mold 3 and a body position fixing plate 4. The headrest 1 is detachably connected to the second positioning member 2 and detachably connected to the first positioning member 6. The structures of the second positioning member 2 and the first positioning member 6 are the same. A first positioning plate 21 is provided below the second positioning member 2, and a second positioning plate 61 is provided below the first positioning member 6. The second positioning member 2 is fixed on the body position placement plate 100 on the CT simulation locator through the first positioning plate 21. For example, there is a cylindrical protrusion on the body position placement plate 100, and the corresponding position of the first positioning plate 21 is provided with holes aligned with the cylindrical protrusion, thus maintaining the fixation of the two. The first positioning member 6 is fixed at the center position on the front surface of the body position fixing plate 4 through the second positioning plate 61. The U-shaped head mold 3 is detachably connected to the first positioning plate 21 and the second positioning plate 61, and the connection positions correspond one by one. Both the headrest 1 and the U-shaped head mold 3 are thermoplastic molding parts. The headrest 1 is formed by molding on the thermoplastic material above the second positioning member 2 by a patient. The U-shaped head mold 3 is formed by stretching a thermoplastic film from the face downwards of the patient lying on the headrest 1 and fixing it on the body position placement plate 100. In this embodiment, the thermoplastic material is baked through an oven, and the thermoplastic film is softened by heating with water.

[0042] Among them, the front surface of the body position fixing plate 4 is a flat surface and the back surface is provided with an adapter 5. The adapter 5 is adapted to the bottom surface of the head and neck combined coil used on the nuclear magnetic resonance scanner and is in surface contact. Specifically, in this embodiment, the body position fixing plate 4 extends from the head to the shoulder position, and the head and neck area is located within the head and neck combined coil. That is, the adapter 5 is arranged on the back surface of the body position fixing plate 4 corresponding to the first positioning member 6, which is also the back surface position of the body position fixing plate 4 corresponding to the part within the head and neck combined coil. And the back surface of the body position fixing plate 4 is also provided with a support member 7 in the area extending outside the head and neck combined coil. As Figure 1 shown, the support member 7 in this embodiment is a support block arranged on both the left and right sides, and the support block is made of soft plastic or rubber material.

[0043] Since the models of nuclear magnetic resonance scanners on the current market are different, among them, in the nuclear magnetic resonance scanners using the head and neck combined coil, there are at least three types of bottom surfaces. For example, the bottom surface of the head and neck combined coil supporting the GE3.0T superconducting nuclear magnetic resonance imaging examination equipment used in this embodiment is arc-shaped, then the adapter 5 is an arc-shaped plate that fits the arc-shaped bottom surface. Therefore, the body position fixing plate 4 and the adapter 5 in this embodiment are detachably connected, and different types of head and neck combined coils can be matched with different adapters 5 for replacement. In this embodiment, it is necessary to design the body position fixing plate 4 using ABS plastic according to the width dimension and aperture size of the head and neck combined coil of the nuclear magnetic resonance scanner to connect the head and neck combined coil.

[0044] As Figure 2 shown, a level 41 is arranged on the front surface of the body position fixing plate 4, and a water column 42 is embedded in the middle position of the back surface of the body position fixing plate 4. When the headrest 1 is connected with the first positioning member 6 in a matching manner, the central axis of the water column 42 coincides with the central axis of the headrest 1 in the vertical projection. As Figure 1 shown, by arranging level 41 both horizontally and vertically, it is ensured that the body position fixing plate 4 is placed horizontally, thereby creating a plane environment the same as that of the body position placement plate 100. At this time, the level 41 is placed at the edge position of the body position fixing plate 4 away from the first positioning member 6, which corresponds to the position of the patient's arm. After the patient lies down, the patient only needs to gently lift the arm to allow the caregiver to observe the situation of the level 41.

[0045] As Figure 6 shown, there is a long column on the right side of the patient's head, which is the development of the water column 42 in the scanning positioning image, and the multiple horizontal and arrowed lines on the patient's head are the assumed tomographic scanning lines. When the water column 42 is not vertical in the scanning positioning image, the tomographic scanning lines will not perform vertical scanning on the patient's head, which will affect the registration and fusion effect of MRI and CT images. Therefore, by ensuring the verticality of the water column 42 in the scanning positioning image, the horizontal and vertical of the tomographic scanning lines are guaranteed, thereby further improving the registration and fusion effect of MRI images and CT images.

[0046] In this embodiment, as Figure 1 and Figure 3 shown, both the second positioning member 2 and the first positioning member 6 are positioning blocks imitating the head and neck curves. Among them, the detachable connection methods between the headrest 1 and the second positioning member 2 and between the headrest 1 and the first positioning member 6 are both snap connections. Since the thermoplastic material is to be placed above the second positioning member 2 in advance, therefore, the positioning blocks imitating the head and neck curves can save consumables on the one hand and are also convenient for disassembly on the other hand.

[0047] As Figure 4 and Figure 6 are different embodiments of the U-shaped head mold 3, Figure 4 in which the covering area of the U-shaped head mold 3 is only the head, Figure 6 in which the covering area of the U-shaped head mold 3 extends from the head to the shoulders and matches the edge size of the body position fixing plate 4. At the same time, in other embodiments, the covering area of the U-shaped head mold 3 can also wrap the head and neck. Therefore, the U-shaped head mold 3 is used to fix the upper body area of the patient so that the body positions are consistent when acquiring CT images and MRI images.

[0048] In this embodiment, a plurality of fixing holes 31 are distributed on the edge of the U-shaped head mold 3, and a buckle member is arranged in the fixing holes 31 for detachably connecting with the first positioning plate 21 and the second positioning plate 61. For example Figure 4 the U-shaped head mold 3 in Figure 6 has two fixing holes 31 at the top, and then one is respectively arranged on both sides of the lower part,

[0049] in

[0050] the top has two fixing holes 31, and there are two fixing holes 31 on each side of the neck and two fixing holes 31 on each side of the shoulders. Correspondingly, corresponding mounting holes 22 are also arranged on the first positioning plate 21 and the second positioning plate 61 for snap connection with the buckle member.

[0051] (1) The patient lies supine on the positioning plate 100 on the CT simulation locator. The patient's head touches the thermoplastic material above the second positioning member 2. After it cools and solidifies, a headrest 1 is obtained. Then, a thermoplastic film is stretched downward from the patient's face while lying on the headrest 1 and fixed on the positioning plate 100. After it cools and solidifies, a U-shaped head mold 3 is obtained;

[0052] Among them, the thermoplastic material is first heated to 35 - 50 °C and then coated on the second positioning member 2. At this time, the patient's head is resting on the thermoplastic material. After the thermoplastic material cools, the headrest 1 adapted to this patient is formed. At the same time, after heating the thermoplastic film to 35 - 50 °C, the patient lying on the headrest 1 is stretched downward from the face to form a head mold adapted to the patient's face, and then stretched downward and fixed on the positioning plate 100 through the buckle member. After the thermoplastic film cools, the U-shaped head mold 3 adapted to this patient is formed.

[0053] (2) The patient lies supine on the headrest 1, the U-shaped head mold 3 is covered on the patient's face and fixed to the positioning plate 100, and then it is sent into the CT simulation locator for CT positioning scanning, and the obtained CT images are transmitted to the radiotherapy planning system;

[0054] (3) The adapter 5 on the body position fixing plate 4 is fitted to the bottom surface of the head and neck combined coil used on the magnetic resonance scanner. The headrest 1 is buckled on the first positioning member 6 of the body position fixing plate 4. The patient lies supine on the headrest 1 in the same position as during CT positioning, and the U-shaped head mold 3 is covered on the patient's face and fixed to the body position fixing plate 4;

[0055] (4) By observing the level gauge 41, the body position fixing plate 4 is adjusted so that the front of the body position fixing plate 4 is in a horizontal position. Then, the head and neck combined coil is covered, and it is sent into the magnetic resonance scanner for magnetic resonance simulation positioning scanning. It is judged whether the water column 42 in the scanning and positioning image is vertical. If so, the subsequent obtained MRI images are transmitted to the radiotherapy planning system. Otherwise, by adjusting the patient's body position until the water column 42 in the scanning and positioning image is vertical, the subsequent obtained MRI images are transmitted to the radiotherapy planning system;

[0056] (5) The CT images and MRI images are subjected to image registration and target area delineation for radiotherapy use.

[0057] This embodiment has the following three improvements:

[0058] 1. Through Figure 7 It can be seen that the obtained MRI images using this embodiment are clear, the image quality is not affected by the device, the registration and fusion effect with the CT images is good, and the fused images can clearly show the position and size of the tumor target area. However, the Figure 8, where the two circles in the same position in the upper and lower images show obvious differences, that is, there is a large misalignment when registering the MRI image and the CT image, and the registration and fusion effect is poor.

[0059] When scoring the image registration, the accuracy of registration is evaluated by the overlap rate (Dice coefficient, a set similarity metric function) and the Hausdorff distance (HD) algorithm. Among them, in the prior art, the score of the MRI image and the CT image before fusion is usually between 30 and 40 points, and the score after fusion by software is usually between 60 and 70 points. In this embodiment, the score of the MRI image and the CT image before fusion is usually between 80 and 90 points, and the score after fusion by software is usually above 90 points. Therefore, in this embodiment, the positions of the CT image and the MRI image are kept consistent during acquisition, so that the registration and fusion effect of the MRI image and the CT image is more excellent, thereby improving the accuracy of target area delineation and improving the radiotherapy effect.

[0060] 2. In order to achieve the consistency of the MRI image and the CT image, the prior art either needs to introduce a latest magnetic resonance simulation locator worth 20 million yuan, or needs to spend nearly 2 million yuan to transform the magnetic resonance bed and repurchase the adapted coil. In this embodiment, the existing head and neck combined coil is used, and only the body position fixing plate 4 adapted to the bottom of the head and neck combined coil is added. The hospital does not need to transform the magnetic resonance bed or repurchase the adapted coil, and the cost of its body position fixing plate 4 and consumables is only a few thousand yuan. Therefore, the transformation cost can be greatly reduced.

[0061] 3. In the present utility model, the body position fixing plate 4 is placed in the head and neck combined coil of the nuclear magnetic resonance scanner, the corresponding headrest 1 is buckled, and after the patient lies on it, the U-shaped head mold 3 is buckled, and then the horizontal adjustment can be carried out for nuclear magnetic resonance scanning. Compared with the conventional method, it only takes less than one minute more. Therefore, the device of this embodiment has great practical value and feasibility.

[0062] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0063] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium; it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0064] In the present utility model, unless otherwise clearly defined and limited, when the first feature is "on" or "under" the second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when the first feature is "above", "over" and "on top of" the second feature, it may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. When the first feature is "under", "beneath" and "underneath" the second feature, it may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0065] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0066] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility model.

Claims

1. A CT-MRI same-position radiotherapy simulation positioning device, characterized in that, It includes a headrest, a first positioning member, and a body position fixing plate. The headrest is detachably connected to the first positioning member. The first positioning member is fixed at the center position on the front surface of the body position fixing plate. The front surface of the body position fixing plate is a plane, and an adapter is provided on the back surface. The adapter is adapted to the bottom surface of the head and neck combined coil used on the magnetic resonance scanner and is in surface contact.

2. The CT-MRI same-position radiotherapy simulation positioning device according to claim 1, characterized in that, A spirit level is provided on the front surface of the body position fixing plate. A water column is embedded at the center position on the back surface of the body position fixing plate. When the headrest is connected to the first positioning member in a matching manner, the central axis of the water column coincides with the central axis of the headrest in the vertical projection.

3. The CT-MRI same-position radiotherapy simulation and positioning device according to claim 2, wherein, It further includes a second positioning member and a U-shaped head mold. The headrest is detachably connected to the second positioning member. The second positioning member has the same structure as the first positioning member. The second positioning member is fixed on the body position placement plate of the CT simulation locator. The U-shaped head mold is detachably connected to the body position fixing plate and the body position placement plate, and the connection positions correspond one by one. Both the headrest and the U-shaped head mold are thermoplastic forming parts. The headrest is formed by thermoplastic material on which the patient lies above the second positioning member. The U-shaped head mold is formed by stretching a thermoplastic film from the face downwards of the patient lying on the headrest and fixing it on the body position placement plate.

4. The CT-MRI same-position radiotherapy simulation and positioning device according to claim 3, wherein, Both the second positioning member and the first positioning member are positioning blocks imitating the curve of the head and neck.

5. The CT-MRI same-position radiotherapy simulation positioning device according to claim 3, wherein, The covering area of the U-shaped head mold extends from the head to the shoulders, and its edge size matches that of the body position fixing plate.

6. The CT-MRI same-position radiotherapy simulation and positioning device according to claim 3, characterized in that, A plurality of fixing holes are distributed on the edge of the U-shaped head mold, and a buckle member is provided in the fixing holes. The buckle member is used for detachable connection with the body position fixing plate and the body position placement plate.

7. The CT-MRI same-position radiotherapy simulation and positioning device according to claim 6, characterized in that, A first positioning plate is provided below the second positioning member, and a second positioning plate is provided below the first positioning member. The second positioning member is fixed on the body position placement plate of the CT simulation locator through the first positioning plate, and the first positioning member is fixed at the center position on the front surface of the body position fixing plate through the second positioning plate; The detachable connection between the U-shaped head mold and the body position fixing plate and the body position placement plate is replaced with: the detachable connection between the U-shaped head mold and the first positioning plate and the second positioning plate; The buckle member is used for detachable connection with the body position fixing plate and the body position placement plate is replaced with: the buckle member is used for detachable connection with the first positioning plate and the second positioning plate.

8. The CT-MRI same-position radiotherapy simulation and positioning device according to claim 1, characterized in that The body position fixing plate is detachably connected to the adapter.

9. The CT-MRI same-position radiotherapy simulation and positioning device according to claim 1, characterized in that, The adapter is provided on the back surface of the body position fixing plate corresponding to the first positioning member. A support member is further provided on the back surface of the body position fixing plate in the area extending outside the head and neck combined coil.

10. The CT-MRI same-position radiotherapy simulation positioning device according to claim 1, characterized in that, The body position fixing plate is an ABS plastic part.

Images