A vertebral positioning method and a vertebral sequence matching method

Abstract

The present invention discloses a vertebral sequence locator and a vertebral sequence matching method, the vertebral sequence matching method comprising: acquiring an MRI sagittal image and a CT sagittal image of a target object; determining the located vertebra from the MRI sagittal image and the CT sagittal image respectively using a locator; and performing vertebral sequence matching based on the located vertebra. The present invention realizes the determination of characteristic points and characteristic observation layers on the CT sagittal image and the MRI sagittal image of a conventional spine, thereby realizing vertebral sequence matching on the CT sagittal image and the MRI sagittal image. By adopting the scheme of the present application, a new positioning mark at the root of the celiac trunk can be established on the thoracic CT and MRI sagittal images and the vertebral sequence matching of the two images can be completed. Compared with the conventional vertebral sequence matching method using the sacrum or axis as the positioning mark, there is no need to expand the CT scanning range or to perform additional MRI cervical or lumbar sagittal positioning images. The present invention is low-cost and simple and easy to implement.

Description

Technical Field

[0001] The present invention relates to the technical field of vertebral sequence matching, and in particular to a vertebral positioning method and a vertebral sequence matching method. Background Art

[0002] During the diagnosis and treatment of spinal diseases, it is often necessary to use both magnetic resonance imaging and CT imaging to clarify the nature of the lesion. When making a clinical diagnosis based on the two images, accurate vertebral sequence matching must be performed, otherwise the information of the two images will be misaligned, which will affect the judgment of the nature of the disease. If the wrong surgical segment is determined as a result, serious medical accidents will occur. The spine is a longitudinal structure from head to tail, and the vertebral sequence or the head and tail boundaries of the lesion can only be observed intuitively and accurately on sagittal spinal images. And when matching vertebral sequences on CT and magnetic resonance sagittal images, positioning must be performed with the help of the same marker visible on both images. The most commonly used positioning method uses the axis at the most head end of the spine or the sacrum at the most tail end as a marker, because both have special morphologies that are easy to identify.

[0003] Chest CT has become a routine hospital admission examination. Although it includes imaging information of the thoracic spine, because the scanning range does not include the conventional positioning markers mentioned above, accurate vertebral sequence matching with MRI cannot be achieved, and additional CT scans with a larger scanning range are often required. Furthermore, the current conventional thoracic spine MRI scanning range does not include the axis at the most cranial end and the sacrum at the most caudal end. Therefore, sagittal positioning images of the cervical or lumbar spine must be obtained to ensure the accuracy of conventional positioning methods.

[0004] In summary, there is currently a lack of positioning markers for vertebral sequence matching on thoracic spine MRI and CT sagittal images within the conventional scanning range. It is necessary to simultaneously expand the CT scanning range and perform additional cervical or lumbar sagittal magnetic resonance positioning images to ensure the accuracy of vertebral sequence matching between thoracic spine CT and sagittal magnetic resonance images, which will increase examination costs and radiation dose. Summary of the Invention

[0005] In view of the defects in the prior art, the present invention provides a vertebral positioning device and a vertebral sequence matching method.

[0006] In a first aspect, a vertebral locator is provided, characterized in that the vertebral locator is transparent; the vertebral locator comprises a plurality of scale lines radiating from a focus, the scale lines comprise a reference scale line, and the vertebral locator further comprises a plurality of positioning lines perpendicular to the reference scale lines.

[0007] Preferably, the interval angle between each scale mark is 10°.

[0008] Preferably, the spacing between each positioning line is 1 mm.

[0009] Preferably, the vertebral body locator is fan-shaped and includes scale lines of 0°-90°, with the reference scale line being 0°.

[0010] In a second aspect, a vertebral positioning method is provided, characterized in that it comprises the following steps:

[0011] Step A1: obtaining a target sagittal image of the spine, and determining a target observation layer and a marker point from the target sagittal image;

[0012] Step A2: determining the positioning vertebra based on the positioning instrument, the target observation layer and the marking points.

[0013] Preferably, in step A1, determining the target observation layer and the marker point from the target sagittal image includes:

[0014] A11, determining a target vessel and its corresponding first visible branch vessel and second visible branch vessel from the target sagittal image, wherein the target vessel, the first visible branch vessel, and the second visible branch vessel form a "Π"-shaped structure, with the first branch vessel being above the second branch vessel;

[0015] A12: Determine a target observation layer and a marking point based on the target blood vessel and its corresponding first visible branch blood vessel and second visible branch blood vessel.

[0016] 10. The vertebral positioning method according to claim 6, wherein in step A12, the method of determining the target observation layer and the marker point based on the target blood vessel and its corresponding first visible branch blood vessel and second visible branch blood vessel comprises:

[0017] A121, determine a first observation layer from the layers of visible branch vessels, and determine a marker point from the "Π"-shaped structure, wherein the first observation layer is the widest layer at the root of the first branch vessel or the second branch vessel, and the marker point is the vertex of the angle between the anterior edge of the target vessel and the upper edge or lower edge of the first branch vessel or the second branch vessel;

[0018] A122, determine whether the first observation layer meets the preset conditions. If so, use the first observation layer as the target observation layer. If not, record the relative position of the marking point on the first observation layer in the window, keep the magnification and the window center position unchanged, observe the sagittal images near the center of other vertebrae, and determine the leftmost layer that meets the preset conditions from the target sagittal images near the center of the spine as the target observation layer, wherein the preset condition is that the spinous process of the vertebra behind the marking point window position is partially or completely visible.

[0019] Preferably, in step A2, the method for determining the location of the vertebral body based on the positioning device, the target observation layer, and the markers includes:

[0020] A21, at the target observation layer, connect the points on the anterior edges of adjacent vertebrae to form an anterior edge line segment, align the focus of the locator with the position of the marker window, and rotate the locator about the focus so that the positioning line on the locator coincides with or is parallel to the anterior edge line segment; obtain the perpendicular intersection point of the reference scale line and the anterior edge line segment; if all the vertebrae anterior edge line segments have a single perpendicular intersection point, determine the intersection point as the positioning marker;

[0021] A22, if the positioning mark is near the midpoint of the anterior wall of the vertebral body, the vertebral body is defined as the positioning vertebral body; if the positioning mark is near the intervertebral disc, the vertebral body on the head side of the intervertebral disc is defined as the positioning vertebral body.

[0022] In a third aspect, a vertebral sequence matching method is provided, the method comprising:

[0023] B1, obtaining MRI sagittal images and CT sagittal images of the target object;

[0024] B2, using the localizer to determine the localized vertebra from the MRI sagittal image and CT sagittal image respectively;

[0025] B3, Vertebral sequence matching is performed based on the located vertebrae.

[0026] The beneficial effects of the present invention are embodied in that: an embodiment of the present invention provides a vertebral sequence matching method, which cooperates with a vertebral locator to realize the determination of characteristic points and characteristic observation layers on CT sagittal images and MRI sagittal images of conventional spine, thereby locating characteristic vertebrae and characteristic positioning marks on CT sagittal images and MRI sagittal images respectively, and realizing vertebral sequence matching on CT sagittal images and MRI sagittal images. By adopting the scheme of the present application, there is no need to expand the CT scanning range and perform additional magnetic resonance cervical or lumbar sagittal positioning images, and the same positioning marks on the two images can be identified and the vertebral sequence matching of the two images can be completed. The present invention is low-cost and simple and easy to implement. An embodiment of the present invention also provides a vertebral locator and a vertebral positioning method. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0028] Figure 1 A flowchart of a vertebral positioning method provided by an embodiment of the present invention;

[0029] Figure 2This is a flow chart of step A1 in a vertebral positioning method provided by an embodiment of the present invention;

[0030] Figure 3 This is a flow chart of step A2 in a vertebral positioning method provided by an embodiment of the present invention;

[0031] Figure 4 A flowchart of a vertebral sequence matching method provided by an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the position of a mouse cursor when the tip of the mouse cursor coincides with a marked point on a CT sagittal image provided by an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of determining a positioning marker on a CT sagittal image using a positioning device provided by an embodiment of the present invention;

[0034] Figure 7 A schematic diagram of observation results on a CT sagittal image provided by an embodiment of the present invention;

[0035] Figure 8 A schematic diagram showing a visible spinous process portion behind a marker window on a CT sagittal image provided by an embodiment of the present invention;

[0036] Figure 9 A schematic diagram of the position of a mouse cursor when the tip of the mouse cursor coincides with a marked point on an MRI sagittal image provided by an embodiment of the present invention;

[0037] Figure 10 A schematic diagram of determining a positioning marker on an MRI sagittal image using a positioning device according to an embodiment of the present invention;

[0038] Figure 11 A schematic diagram showing the visible spinous process behind the marker window on the sagittal MRI image provided by an embodiment of the present invention; DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0040] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0041] The present invention is applied to the field of medical imaging. The positioning device, MRI vector image, and CT vector image involved in the following embodiments are all displayed on a display, and the spinal positioning method and spinal vertebral sequence matching method involved are all implemented through the cooperation of the display and input devices (including but not limited to a mouse and keyboard).

[0042] Example 1,

[0043] A structural schematic diagram of a vertebral locator provided in an embodiment of the present invention, wherein the vertebral locator is transparent; the vertebral locator includes a plurality of scale lines radiating from a focus, the scale lines include a reference scale line, and the vertebral locator also includes a plurality of positioning lines perpendicular to the reference scale lines.

[0044] In the embodiment of the present invention, the interval angle between each scale mark is 10°.

[0045] In the embodiment of the present invention, the spacing between the positioning lines is 1 mm.

[0046] In an embodiment of the present invention, the vertebral body locator is fan-shaped and includes scale lines ranging from 0° to 90°, with the reference scale line being 0°.

[0047] The positioning device of the present invention can well assist in positioning the vertebral body. The specific structural diagram can be referred to Figure 5 or Figure 6 It should be noted that the vertebral positioning instrument provided by the present invention can be a transparent icon or a physical object made of a transparent material, and its specific form is not limited in the embodiments of the present invention.

[0048] Example 2

[0049] like Figure 1 As shown, an embodiment of the present invention provides a vertebral positioning method, the method comprising the following steps:

[0050] Step A1: obtaining a target sagittal image of the spine, and determining a target observation layer and a marker point from the target sagittal image;

[0051] like Figure 2 Specifically, in step A1, determining the target observation layer and the marking point from the target sagittal image includes:

[0052] A11, determining a target vessel and its corresponding first and second visible branch vessels from the target sagittal image, wherein the target vessel, the first and second visible branch vessels form a "Π"-shaped structure, with the first branch vessel being above the second branch vessel; wherein the first branch vessel is the celiac trunk, the second branch vessel is the superior mesenteric artery, and the target vessel is the abdominal aorta;

[0053] A12: Determine a target observation layer and a marking point based on the target blood vessel and its corresponding first visible branch blood vessel and second visible branch blood vessel.

[0054] Furthermore, in step A12, the method of determining the target observation layer and the marking point according to the target blood vessel and its corresponding first visible branch blood vessel and second visible branch blood vessel includes:

[0055] A121, determine a first observation layer from the layers of visible branch vessels, and determine a marker point from the "Π"-shaped structure, wherein the first observation layer is the widest layer at the root of the first branch vessel or the second branch vessel, and the marker point is the vertex of the angle between the anterior edge of the target vessel and the upper edge or lower edge of the first branch vessel or the second branch vessel;

[0056] A122, determine whether the first observation layer meets the preset conditions. If so, use the first observation layer as the target observation layer. If not, record the relative position of the marking point on the first observation layer in the window, keep the magnification and the window center position unchanged, observe the sagittal images near the center of other vertebrae, and determine the leftmost layer that meets the preset conditions from the target sagittal images near the center of the spine as the target observation layer, wherein the preset condition is that the spinous process of the vertebra behind the marking point window position is partially or completely visible.

[0057] Specifically, the relative position of the marking point on the first observation level in the window is recorded, and the magnification and the center position of the window are kept unchanged. The essence of observing the sagittal images near the center of other vertebrae is: align the tip of the mouse cursor with the marking point, use the position of the tip of the mouse cursor to represent the height and front-back position of the marking point, and keep the position of the mouse cursor constant on the screen, slide the mouse wheel or use keyboard keys to observe the sagittal image near the center of the spine.

[0058] Specifically, the spinous process behind the marked point is partially or completely visible in essence: the spinous process of the vertebra behind the mouse cursor on the first observation layer is partially or completely visible, or the spinous process of the vertebra behind the mouse cursor on the target observation layer is partially or completely visible.

[0059] like Figure 3 As shown, in step A2, the positioning vertebra is determined based on the positioning instrument, the target observation layer and the marking points.

[0060] Specifically, in step A2, the method for determining the location of the vertebral body according to the positioning device, the target observation layer, and the marking points includes:

[0061] A21, at the target observation layer, connect the points on the anterior edges of adjacent vertebrae to form an anterior edge line segment, align the focus of the locator with the position of the marker window, and rotate the locator about the focus so that the positioning line on the locator coincides with or is parallel to the anterior edge line segment; obtain the perpendicular intersection point of the reference scale line and the anterior edge line segment; if all the vertebrae anterior edge line segments have a single perpendicular intersection point, determine the intersection point as the positioning marker;

[0062] A22, if the positioning mark is near the midpoint of the anterior wall of the vertebral body, the vertebral body is defined as the positioning vertebral body; if the positioning mark is near the intervertebral disc, the vertebral body on the head side of the intervertebral disc is defined as the positioning vertebral body.

[0063] In summary, the embodiment of the present invention provides a vertebral positioning method, which, in conjunction with a vertebral positioning instrument, realizes the determination of characteristic points and characteristic observation layers on conventional spinal sagittal images, thereby locating characteristic vertebrae and characteristic positioning marks, providing basic support for vertebral sequence matching.

[0064] Example 3

[0065] like Figure 4 As shown, based on the above embodiment, an embodiment of the present invention further provides a vertebral sequence matching method, the method comprising:

[0066] B1, obtaining MRI sagittal images and CT sagittal images of the target object;

[0067] B2, using the localizer to determine the localized vertebra from the MRI sagittal image and CT sagittal image respectively;

[0068] B3, Vertebral sequence matching is performed based on the located vertebrae.

[0069] Specifically, in step B2, the method of using the locator to determine the located vertebral body from the MRI sagittal image and the CT sagittal image respectively is referred to the above embodiment and will not be described in detail in this embodiment.

[0070] Specifically, in step B3, the method for performing vertebral sequence matching based on the positioned vertebra includes: when performing vertebral sequence matching using the positioning mark, the image can be positioned according to the following rules: if the positioning mark is near the midpoint of the anterior wall of the vertebra, the vertebra is defined as the positioned vertebra; if the positioning mark is near a certain intervertebral disc, the vertebra on the head side of the intervertebral disc is defined as the marked vertebra, and each vertebra is sorted according to its relative positional relationship with the positioned vertebra. Furthermore, the consistency of the positioned vertebrae on the two images can be verified by the following steps: after finding the positioning mark and determining the positioned vertebra using a positioning instrument, the position of the positioning instrument is kept unchanged, an observation point is selected on the positioned vertebra, and its corresponding positioning angle on the positioning instrument is read. Preferably, the anterior upper vertex of the vertebral cancellous bone part on the CT is used as the observation point, and the anterior upper vertex of the vertebral cancellous bone part showing a high signal on the MRIT2 image is used as the observation point. The consistency of the positioned vertebrae on the two images is verified by the similarity of the positioning angles of the same observation point on the two images.

[0071] In summary, the embodiment of the present invention provides a vertebral sequence matching method, which cooperates with a vertebral locator to realize the determination of characteristic points and characteristic observation layers on the CT sagittal image and MRI sagittal image of the conventional spine, thereby locating the characteristic vertebrae and characteristic positioning marks on the CT sagittal image and MRI sagittal image respectively, and realizing vertebral sequence matching on the CT sagittal image and MRI sagittal image. By adopting the solution of the present application, there is no need to expand the CT scanning range and add a magnetic resonance cervical or lumbar sagittal positioning image, and the same positioning mark on the two images can be identified and the vertebral sequence matching of the two images can be completed. The present invention is low-cost and simple and easy to implement.

[0072] In order to better understand the solution of the present invention, the operation examples of the vertebral positioning method and vertebral sequence matching method of the present application are described in detail below.

[0073] 1. After 3D reconstruction using a plain CT scan, observe the two adjacent branches of the aorta on the sagittal image. These branches form a "Π" shape with the abdominal aorta, with the opening facing forward. On the layer with the widest diameter of the upper branch, mark the vertex of the angle between the upper edge of the upper branch and the leading edge of the aorta. Align the tip of the mouse cursor with this mark, as shown below. Figure 5 As shown, for clarity, the mouse is marked with a dotted circle. It should be noted that the mouse position in the images involved below is also marked with a dotted circle.

[0074] 2. Keep the cursor in a constant position on the screen, slide the mouse wheel and adjust the layer position to the center of the spine. Observe the layer visible behind the mouse cursor, such as Figure 8 As shown, select the leftmost layer as the observation layer.

[0075] At this observation level, make the focus of the vertebral locator overlap with the tip of the mouse cursor, and rotate the locator with the marked point as the axis so that a positioning line on the locator passes through the anterior superior apex of the two adjacent vertebrae behind the mark. At this time, the 0° scale line on the locator intersects the vertebral anterior edge line segment perpendicularly, and the intersection point is near the level of the intervertebral disc. The 0° scale line passing through the marked point cannot intersect with other vertebral anterior edge line segments, such as Figure 6 As shown in the figure, the short bold black line is the anterior edge of the vertebral body, and the long bold black line is the 0° scale line. The vertical intersection is defined as the positioning mark, and the vertebral body adjacent to the intervertebral disc at the vertical intersection is defined as the positioning vertebral body. The corresponding positioning angle of its anterior superior vertex on the positioning instrument is about 50°, as shown in the figure. Figure 6 As shown in the figure, the positioning angle corresponding to the anterior superior vertex of the vertebral body on the head side is about 70°, and the positioning angle corresponding to the anterior superior vertex of the vertebral body on the caudal side is about 0°. The vertebrae are sorted with the positioning vertebra as a reference. In this case, the positioning vertebra is recorded as vertebral body No. 1, and the vertebrae in the head direction are sorted in order as vertebral body No. 2, 3, 4, etc. Figure 6 shown.

[0076] 3. Align the tip of the mouse cursor with the positioning mark, such as Figure 7 As shown, by sliding the mouse wheel to adjust the layer position and view images at different levels, it can be seen that there are compressive objects at the intervertebral disc level between vertebrae 1 and 2, and vertebrae 2 and 3 in the back of the spinal canal.

[0077] 5. Follow the same steps as above to observe and locate the sagittal thoracic spine MRI image. Observe the two branches of the aorta that are adjacent to the blood vessels. On the layer with the widest diameter of the upper branch blood vessel root, select the vertex of the angle between the upper edge of the upper branch blood vessel and the front edge of the aorta as the mark point, and align the tip of the mouse cursor with the mark point. Figure 9 shown.

[0078] 6. Keep the cursor in a constant position on the screen, slide the mouse wheel and adjust the layer position to the center of the spine, such as Figure 11 As shown in the figure, observe the layer where the spinous process behind the marker is visible, and select the leftmost layer as the observation layer. On this observation layer, make the focus of the vertebral locator overlap with the marker, as shown in the figure. Figure 10 As shown in the figure, the locator is rotated with the marked point as the axis so that a positioning line on the locator passes through the anterior superior apex of the two adjacent vertebrae behind the mark at the same time. At this time, the 0° scale line on the locator intersects the anterior edge line segment of the vertebra at right angles, and the intersection point is near the level of the intervertebral disc. In addition, the 0° scale line passing through the marked point cannot intersect with the anterior edge line segment of other vertebrae, as shown in the figure. Figure 10As shown in the figure, the short bold black line is the anterior edge of the vertebral body, and the long bold black line is the 0° scale line. The vertical intersection is defined as the positioning mark, and the vertebral body adjacent to the intervertebral disc at the vertical intersection is defined as the positioning vertebral body. The corresponding positioning angle of its anterior superior vertex on the positioning instrument is about 53°, as shown in the figure. Figure 10 As shown in the figure, the positioning angle corresponding to the anterior superior vertex of the vertebral body on the head side is about 70°, and the positioning angle corresponding to the anterior superior vertex of the vertebral body on the caudal side is about 0°. The vertebrae are sorted with the positioning vertebra as a reference. In this case, the positioning vertebra is recorded as vertebral body No. 1, and the vertebrae in the head direction are sorted in order as vertebral body No. 2, 3, 4, etc. Figure 10 As shown, by sliding the mouse wheel to adjust the layer position and view images at different levels, it can be seen that the spinal cord at the level of the intervertebral disc between vertebrae 2 and 3 at the back of the vertebral canal is obviously compressed and deformed, and there are abnormal spinal cord signals, while the spinal cord at the level of the intervertebral disc between vertebrae 1 and 2 is not obviously compressed.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A vertebral positioning method, characterized in that: The following steps are involved: Step A1: obtaining a target sagittal image of the spine, and determining a marker point and a target observation layer from the target sagittal image; Step A2: determining the located vertebra based on a vertebral sequence locator, the position of the marker within the viewing window, and the target observation layer; the vertebral sequence locator includes a plurality of scale lines radiating from the focal point, the scale lines including a reference scale line, and the vertebral sequence locator also includes a plurality of positioning lines perpendicular to the reference scale lines; In step A1, determining the target observation layer and the marker points from the target sagittal image includes: A11, determining a target vessel and its corresponding first and second visible branch vessels from the target sagittal image, wherein the target vessel, the first and second visible branch vessels form a "Π"-shaped structure, with the first branch vessel above the second branch vessel; wherein the first branch vessel is the celiac trunk, the second branch vessel is the superior mesenteric artery, and the target vessel is the abdominal aorta; A12, determining a target observation layer and a marking point based on the target blood vessel and its corresponding first visible branch blood vessel and second visible branch blood vessel; In step A2, the method for determining the location of the vertebra based on the vertebral sequence locator, the target observation layer, and the markers includes: A21, at the target observation layer, connect the points on the anterior edges of adjacent vertebrae to form an anterior edge line segment, align the focus of the locator with the position of the marker window, and rotate the locator around the focus so that the positioning line on the locator coincides with or is parallel to the anterior edge line segment; obtain the perpendicular intersection point between the reference scale line and the anterior edge line segment; when all the vertebrae anterior edge line segments have a single perpendicular intersection point, determine that intersection point as the positioning marker; A22, if the positioning mark is near the midpoint of the anterior wall of the vertebral body, the vertebral body is defined as the positioning vertebral body; if the positioning mark is near the intervertebral disc, the vertebral body on the head side of the intervertebral disc is defined as the positioning vertebral body.

2. A vertebral positioning method according to claim 1, characterized in that: Step A12, a method for determining a target observation layer and a marking point based on the target blood vessel and its corresponding first visible branch blood vessel and second visible branch blood vessel includes: A121, determine a first observation layer from the layers of visible branch vessels, and determine a marker point from the "Π"-shaped structure, wherein the first observation layer is the widest layer at the root of the first branch vessel or the second branch vessel, and the marker point is the vertex of the angle between the anterior edge of the target vessel and the upper edge or lower edge of the first branch vessel or the second branch vessel; A122, determine whether the first observation layer meets the preset conditions. If so, use the first observation layer as the target observation layer. If not, record the relative position of the marking point on the first observation layer in the window, keep the magnification and the window center position unchanged, observe the sagittal images near the center of other vertebrae, and determine the leftmost layer that meets the preset conditions from the target sagittal images near the center of the spine as the target observation layer, wherein the preset condition is that the spinous process of the vertebra behind the marking point window position is partially or completely visible.

3. A vertebral sequence matching method, characterized in that: The method is applicable to the vertebral positioning method according to claim 1 or 2, and the method comprises: B1, obtaining MRI sagittal images and CT sagittal images of the target object; B2, using the localizer to determine the localized vertebra from the MRI sagittal image and CT sagittal image respectively; B3, Vertebral sequence matching is performed based on the located vertebrae.

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