Auricle projection area measurement method and system based on medical image

Abstract

The invention discloses a medical image-based auricle projection area measurement method and system, and belongs to the technical field of forensic medicine. According to the method, a head CT image sequence is subjected to three-dimensional reconstruction through an improved Marking Cubes algorithm to form a high-precision head three-dimensional model, an auricle region is further extracted through fine segmentation, auricle projection areas are automatically measured at all visual angles through a dynamic angle iterative algorithm, and finally the maximum projection area value is determined. The problems that traditional manual measurement is low in precision and poor in efficiency, and the precision is affected due to the fact that modeling holes are prone to occurring in handheld three-dimensional scanning equipment are solved. The method can be applied to forensic medicine auricle defect quantitative evaluation, and a high-precision and objective basis is provided for judicial expertise.

Description

Technical Field

[0001] The present invention relates to the technical field of forensic medicine, and specifically to a method for measuring the projected area of the auricle based on medical imaging images (including but not limited to CT, MRI, etc.), which is used for the quantitative evaluation of auricle defects in forensic identification. Background Art

[0002] Existing auricle area measurements mostly rely on manual delineation or two-dimensional photography, which have problems of low accuracy and poor efficiency. The lack of a clear measurement method in the GA / T 1970-2021 standard easily leads to inconsistent and incorrect identification conclusions. Summary of the Invention

[0003] The present invention discloses a method for measuring the projected area of the auricle based on medical imaging. Through three-dimensional reconstruction and multi-angle projection optimization of medical imaging images, automatic measurement of the maximum projected area of the auricle is achieved, specifically including: (1) Extracting the auricle region based on threshold segmentation and manual refinement selection; (2) Generating a three-dimensional model using an improved Marching Cubes algorithm; (3) Determining the maximum projected area through dynamic angle iteration and generating a visualization result.

[0004] This method solves the problem of low accuracy in traditional manual measurement and can be applied to the quantitative evaluation of auricle defects in forensic medicine. Description of the Drawings Figure 1 It is: the original CT image (slice thickness ≤ 1 mm), the red box is the auricle region segmentation (threshold range 80 - 120 HU), step size 5°) calculating the projected area (minimum → maximum projected area) Figure 2 It is: through three-dimensional reconstruction of the auricle (improved Marching Cubes algorithm) and dynamic angle iteration (0° → 180°).

Claims

1. A method for measuring the projection area of ​​the auricle based on medical imaging examinations (including but not limited to CT or MRI), characterized in that The following steps are involved: Acquire a head imaging image of the target object; Performing threshold segmentation or manual selection segmentation on the CT image to extract the auricle area; Based on the segmentation results, the improved Marching Cubes algorithm is used to reconstruct the three-dimensional model of the auricle, and the model can be finely reconstructed again through manual segmentation; The maximum projection area is determined by dynamic angle iteration calculation.

2. The measuring method according to claim 1, characterized in that: The threshold segmentation adopts Otsu algorithm.

3. The measuring method according to claim 1, characterized in that: The step size of the dynamic angle iteration is 1-15°, and the calculation angle range is 0°-180°.

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