Method and auxiliary tool for reconstructing skeleton digital model based on scanned image

Abstract

The invention discloses a method and an auxiliary tool for reconstructing a skeleton digital model based on a scanned image. The method comprises the following steps: performing image scanning, image segmentation and model reconstruction on the auxiliary tool to obtain an inner-layer component model; importing the reconstructed inner-layer component model into reverse engineering software or 3D printing support software, calculating the volume of the inner-layer component reconstruction model, and dividing the volume of the inner-layer component reconstruction model by the volume of the original inner-layer component to obtain the volume change rate of the reconstruction model caused by the whole technical process; and correcting the volume of the reconstructed digital skeleton model using the rate of volume change of the reconstructed model. The volume increasing proportion of each scanning and model reconstruction can be accurately known, then accurate correction is carried out, and the 3D model reconstruction precision is effectively improved. According to experimental verification, compared with a traditional skeleton digital model reconstruction method, the absolute average deviation value between the skeleton digital model obtained through reconstruction of the method provided by the invention and an actual structure is 0.2-0.5 mm smaller than that of the traditional method.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a method and an auxiliary tool for reconstructing a bone digital model based on a scanned image. Background technique [0002] At present, the application of 3D printing in medical treatment is in the ascendant. The common medical applications of 3D printing technology mainly include: printing prosthesis, implant, template, guide plate and so on. 3D printing technology has its irreplaceable advantages in realizing individual design. In order to achieve individual design goals, these technologies are often inseparable from the reconstruction of 3D digital models of patient anatomical structures (such as bones) using CT and MR images of patients. [0003] For example, a Chinese invention patent application with the publication number CN107320221A discloses a 3D printing-based method for making a deformed knee bone model, which mainly includes the following steps: (1) perf...

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Problems solved by technology

However, the final result often results in a larger volume of the reconstructed model than the actual structure, and the proportion of the volume increase varies depending on the specific anatomical structure. Taking the hip bone as an example, the volume of the hip bone reconstruction is generally 5-15% larger. This volume increase often brings The reconstruction model has a large deviation from the real structure

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