Spinal column 3D model constructing method based on C-arm 2D projection images

Abstract

Provided is a spinal column 3D model constructing method based on C-arm 2D projection images. The method comprises the following steps: obtaining two to three 2D projection images of a patient's spinal column when a C-arm is at a front position and a lateral position and extracting bone tissue contours from the images after correcting; extracting standard spinal column 3D images already processed, performing adaptive global deformation and then performing partition refinement deformation; and enabling the deformed 2D projection images of a healthy human spinal column at the front position and the lateral position to coincide with the 2Dprojection images of a patient's spinal column at corresponding positions so as to finish the spinal column 3D model construction. The provided method, mainly used in surgical navigation technologies, makes up the defects of two modes, i.e., CT-based surgical navigation and surgical navigation based on C-arm x-ray image-intensifier (XRII) and provides 3D image support for multi-field bone surgery navigation including pedicle screw implantation so that 2D images of the cross section of the patient's spinal column can be obtained promptly. The provided method also supports bone tissue biopsy, long tubular intramedullary nail fixation, pedicle screw implantation surgeries and the like.

Description

Technical field [0001] The invention relates to computer imaging technology, in particular to a method for constructing a 3D model of the spine based on a C-shaped arm 2D projection image. Background technique [0002] The spine is one of the most important organs of the human body. It bears more than 80% of the load of the upper part of the human body, and forms a protector for the spinal cord, the key nervous tissue of the human body. Therefore, the health of the spine will directly affect the overall function of the person. Spinal fixation surgery based on pedicle screws can achieve anatomical reduction and spinal decompression, and can eliminate excessive extension and flexion loads, helping to maintain the stability of the fixation. Its superior mechanical properties have been recognized and have been widely used in clinical practice. Spine pedicle screw implantation surgery requires the determination of the ideal screw entrance on the vertebral body, and the real-time mo...

AI Technical Summary

Problems solved by technology

However, there are deficiencies in this type of surgical navigation: for spinal surgery applications, it can only provide two 2D images of front view and lateral view, and both are projection images rather than tomographic images. More importantly, its Inability to provide cross-sectional images important for pedicle screw placement

The biggest disadvantage of this surgical navigation system: it must rely on an isocentric C-arm device with 3D imaging capabilities, which is very expensive

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