Method for establishing human knee joint three-dimensional simulation model in combination with CT (Computed Tomography) and MRI (Magnetic Resonance Imaging)

A two-dimensional image and three-dimensional simulation technology, applied in the field of medical imaging, can solve problems such as inability to understand the anatomical structure of the knee joint, and achieve clear anatomical relationships, convenient scanning, and clear images

Inactive Publication Date: 2015-12-09
FIRST AFFILIATED HOSPITAL OF KUNMING MEDICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies in the prior art, overcome the shortcoming that the three-dimensional model of the knee joint cannot be completely modeled by using CT or MRI two-dimensional images alone, and combine the respective advantages of the two, b

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  • Method for establishing human knee joint three-dimensional simulation model in combination with CT (Computed Tomography) and MRI (Magnetic Resonance Imaging)
  • Method for establishing human knee joint three-dimensional simulation model in combination with CT (Computed Tomography) and MRI (Magnetic Resonance Imaging)
  • Method for establishing human knee joint three-dimensional simulation model in combination with CT (Computed Tomography) and MRI (Magnetic Resonance Imaging)

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0062] Experimental example 1

[0063] Establishment of a three-dimensional anatomical simulation model of human knee joint based on CT and MRI two-dimensional images

[0064] Step (1), CT image acquisition

[0065] Both lower limbs were scanned by SIEMENS 128-row dual-source spiral CT. Scanning position: The knee joint is naturally straightened and externally rotated at a fixed angle of 10°~15°. Scanning range: upper to middle pelvic plane, the lower part completely includes the foot. CT images are mainly used to observe bone tissue. The scanning parameters are set as: dual-source CT tube voltage 120kV and 70kV, tube current 100mA and 60mA, layer thickness 0.6mm, layer interval 0.6mm, and pitch 0.5.

[0066] Step (2), MRI image acquisition

[0067] The GE1.5T superconducting magnetic resonance machine is used to scan the knees, and the magnetic resonance machine uses the head coil as the receiving coil. The scanning position is that the knee joint is naturally straightened and exte...

Example Embodiment

[0084] Experimental example 2

[0085] Establishment of three-dimensional finite element model after artificial total knee arthroplasty

[0086] ① Scanning the prosthesis and establishing a three-dimensional digital model

[0087] Connect the PFCSigma fixed platform full knee system prosthesis to the registration mark and spray it in white, and scan it with a three-dimensional laser scanner, such as Figure 8 with Picture 9 Shown. Import the scanned data into GeomagicStudio12 reverse engineering software, register the 3D point cloud model by positioning points, and optimize the surface. Firstly, based on the principle of curvature continuity, the cavities on the surface of the model are filled to remove non-characteristic indentations on the surface of the model, smooth the loose surface, and prevent the occurrence of non-characteristic high curvature and self-intersecting surfaces. Then use contour lines to describe the changes in the surface curvature of the model, and use param...

Example Embodiment

[0095] Experimental example 3

[0096] Analysis of dynamic finite element model after artificial total knee arthroplasty

[0097] ①Coordinate calculation of three-dimensional dynamic finite element model of knee joint

[0098] According to the description of the knee joint flexion motion analysis of the flexion and extension, internal and external rotation, adduction and abduction angles of the femur relative to the tibia, a three-dimensional dynamic model of the knee joint is established using the definition method of Kadan angle coordinate transformation. Define the coordinate system of the knee joint tibia in the extension position as the reference coordinate system 1, the knee joint femoral coordinate system is defined as the fixed coordinate system, and the other phase knee joint femoral coordinate system is defined as the motion coordinate system 2, then the knee joint femur is from 0° The ZYX Euler angles of the extension coordinate system 1 transformed to other phase coordin...

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Abstract

The invention relates to a method for establishing a human knee joint three-dimensional simulation model in combination with CT (Computed Tomography) and MRI (Magnetic Resonance Imaging), and belongs to the technical field of medical images. The method comprises six steps of CT image acquisition, MRI image acquisition, data storage, CT two-dimensional image importing and three-dimensional model establishment, MRI two-dimensional image importing and three-dimensional model establishment, and knee joint anatomy simulation model registration and modification. The method combines the advantages of CT and MRI scanning, so that the scanning is convenient and fast, the images are clear, the dissection relation is definite, the density resolution is very high, and the scanning range is very wide. According to the method, two sets of images are registered through a three-dimensional image registration technology, three-dimensional coordinate systems of two types of images are unified by fitting point cloud contours and anatomical feature points of femurs, tibias and fibulas, and registration is performed through a registration module to obtain a double-lower-limb full-length knee joint three-dimensional digital model with structures of bones, cartilages, meniscuses, ligaments, muscle tendons and the like.

Description

technical field [0001] The invention belongs to the technical field of medical imaging, and in particular relates to a method for establishing a complete geometric anatomical simulation model of human knee joints by combining CT and MRI two-dimensional images. Background technique [0002] Both CT and MRI are currently commonly used clinical imaging techniques, and both have their own advantages and disadvantages. The full name of CT is computed tomography (CT), which emits X-rays from a scanner to perform a layer-by-layer cross-sectional scan of a certain range of the human body, obtains information, and obtains a cross-sectional anatomical map of the human body after computer processing. CT scanning is convenient and rapid, with clear images, clear anatomical relationships, high density resolution, and can distinguish different tissues with a density difference of only 5-6 Hu. Especially for the observation of bone tissue, it has obvious advantages, and can clearly distin...

Claims

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Application Information

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IPC IPC(8): G06T17/00G06F3/0482
Inventor 李彦林韩睿黄赞李建王国梁何川姬林松
Owner FIRST AFFILIATED HOSPITAL OF KUNMING MEDICAL UNIV
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