Soft tissue deformation method based on metaball model driving

A model-driven, soft tissue technology, applied in the field of virtual surgery, to meet the real-time requirements of the system, good deformation effect, and smooth soft tissue surface.

Pending Publication Date: 2022-07-08
苏州迪威视景数字科技有限公司
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Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the authenticity problem of the traditional grid model and the iterative periodicity problem of the traditional physical method, provide a soft tissue deformation method driven by the metaball model, expan

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  • Soft tissue deformation method based on metaball model driving
  • Soft tissue deformation method based on metaball model driving
  • Soft tissue deformation method based on metaball model driving

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[0062] The present invention will be further described below in conjunction with other drawings and specific embodiments.

[0063] like figure 1 As shown, the present invention provides a soft tissue deformation method driven by a metaball model, and the main steps are as follows:

[0064] 1. Construction of the topological structure of the meta-sphere model and its optimization method

[0065] First use the BradshowGareth ball tree generation algorithm, based on the original triangular mesh model ( figure 2 (a) in) generate a Voronoi diagram, and according to the Voronoi diagram, generate the required meta-sphere model, such as figure 2 shown in (b). figure 2 (c) in (c) shows the comparison results of the mesh model and the metasphere model together. from figure 2 It can be seen that the generated meta-sphere model fits well with the triangular mesh model.

[0066] On the basis of the obtained meta-sphere model, the topology structure is constructed, and the followi...

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Abstract

The invention provides a soft tissue deformation method based on metaball model driving, which comprises the following four steps: a construction stage of a metaball model topological structure: generating a Voronoi diagram according to an original grid model by using a BradshowGareth ball tree generation algorithm, further generating a metaball model, and constructing the topological structure of the metaball model through a method of setting a threshold value; in the metaball model deformation calculation stage, an extended position dynamics algorithm is combined with Laplacian coordinate constraint to simulate the deformation process of the soft tissue body model; in the skin-covering stage of the soft tissue model, distance field functions of the metaball in the body model are established respectively, a mapping relation is established between the metaball model and the epidermis grid model, and the skin-covering process is achieved; and a realistic drawing and real-time tactile rendering stage: performing realistic drawing according to the physical deformation of the soft tissue, and performing real-time tactile rendering based on a GeomagicTouch force feedback device. The method can truly simulate the deformation process of the soft tissue in the virtual operation, and has the characteristics of strong physical reality sense and good real-time performance.

Description

technical field [0001] The invention relates to a soft tissue deformation method driven by a metaball model, which is used in the technical field of virtual surgery. Background technique [0002] With the continuous expansion and in-depth application of Virtual Reality (VR) technology in the medical field, virtual surgery (Virtual Surgery) and VR surgical simulators have attracted more and more attention. Virtual surgery technology has many advantages such as controllable surgical environment and instrument response, repeatable drills, etc., and has become the development trend of future surgical training. Doctors use VR surgical simulators for surgical training and planning, which can reduce the cost and risk of surgical training and treatment; reduce the dependence on animals and cadavers in doctor training and teaching; improve the skills and accuracy of clinical medical diagnosis and treatment; It can be popularized more quickly; it can also reduce the pain of treatment...

Claims

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Application Information

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IPC IPC(8): G16H50/50G06T17/20
CPCG16H50/50G06T17/205G06T2210/41G06T2210/44Y02T90/00
Inventor 潘俊君蒋云
Owner 苏州迪威视景数字科技有限公司
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