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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)

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, by fitting the femur and tibia Based on the location of bone tissues such as fibula and fibula, combined with soft tissue anatomical data, a 3D digital anatomical simulation model of the full-length knee joint of both lower limbs including bone, cartilage, meniscus, ligament and tendon was obtained

Method used

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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
Effect test

experiment example 1

[0063] Establishment of 3D anatomical simulation model of human knee joint based on 2D images of CT and MRI

[0064] Step (1), CT image acquisition

[0065] SIEMENS 128-slice dual-source spiral CT was used to scan both lower extremities. Scanning position: the knee joint is naturally straightened and externally rotated at an angle of 10° to 15°. Scanning range: above to the middle pelvic plane, completely including the foot below. CT images are mainly used to observe bone tissue. Scanning parameters are set as follows: tube voltage of dual-source CT is 120kV and 70kV, tube current is 100mA and 60mA, slice thickness is 0.6mm, slice interval is 0.6mm, and pitch is 0.5.

[0066] Step (2), MRI image acquisition

[0067] A GE1.5T superconducting magnetic resonance machine was used to scan both knees, and the magnetic resonance machine used the head coil as the receiving coil. The scanning position is that the knee joint is naturally straightened and externally rotated at an ang...

experiment example 2

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

[0086] ① Prosthesis scanning and establishment of 3D digital model

[0087] After connecting the PFCSigma fixed platform total knee system prosthesis with the registration mark points, spray it in white and scan it with a 3D laser scanner, as shown in Figure 8 and Figure 9 shown. Import the scanned data into GeomagicStudio12 reverse engineering software, register the 3D point cloud model through the positioning points, and perform surface optimization. Firstly, the cavity on the model surface is filled based on the principle of curvature continuity, the non-characteristic indentation on the model surface is removed, the loose surface is smoothed, and the generation of non-characteristic high curvature and self-intersecting surfaces is prevented. Then use the contour line to describe the change of the surface curvature of the model, and use the parametric adjustment me...

experiment example 3

[0096] Dynamic finite element model analysis of artificial total knee arthroplasty

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

[0098] According to the description of the flexion and extension, internal and external rotation, and adduction and abduction angles of the femur relative to the tibia, the three-dimensional dynamic model of the knee joint was established by using the definition method of the Cardan angle coordinate transformation. Define the coordinate system of the knee joint tibia in the straight position as the reference coordinate system 1, the knee joint femur coordinate system as the fixed coordinate system, and the other phase knee joint femoral coordinate system as the motion coordinate system 2, then the knee joint femur starts from 0° The Z-Y-X Euler angles of the extension coordinate system 1 transformed to other phase coordinate system 2 are φ, θ, ψ respectively, where φ represents the interna...

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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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