Cross spring model for real-time deformation of soft tissue in virtual surgery

Abstract

The invention discloses a cross spring model for simulating real-time deformation of a soft tissue in a virtual surgery. An OpenGL graphical interface is connected to a PC machine first, a manual controller is connected into the OpenGL graphical interface, a 3D human body model is established in the PC machine, and the manual controller forms a virtual agent on the 3D human body model; a modeling method of the cross spring model comprises the following steps: 1, initializing a virtual scene; 2, detecting position; 3, judging whether collision exists; 4, giving virtual contact pressure; 5, filling a cross spring force touch calculating model into a local area in which the virtual agent interacts with the virtual soft tissue; 6: performing deformation calculation and graphic refreshing on the local area of the soft tissue, and feeding back and outputting force touch information. The cross spring model quickens deformation calculation and reduces the calculation amount; through change of corresponding parameters in the modeling method, deformation of different soft tissues can be simulated, so that the modeling method is wide in applicability.

Description

technical field [0001] The invention relates to a cross spring model used for real-time deformation of soft tissue in virtual surgery, in particular to a cross spring model used for real-time deformation of soft tissue in a virtual surgery based on physical meaning of human-computer interaction in the simulation process of virtual surgery. The technical field of modeling methods for haptic reproduction. Background technique [0002] With the rapid development of science and technology, my country has made great progress in medical and health care. Virtual surgery refers to doctors performing surgical training and surgical planning in a computer virtual environment. It is an important application of virtual reality technology in medicine. Virtual surgery can simulate common surgical procedures. The virtual surgery simulation can be performed on the human soft tissue to reduce the risk of surgery and obtain the best surgical effect. Utilizing virtual surgical simulation, the...

AI Technical Summary

Problems solved by technology

Among the currently commonly used flexible body deformation models based on physical meaning, although the finite element model is accurate, it requires a large number of mesh nodes, a large calculation time consumption, and poor real-time performance.

The construction of the spring mass model network is simple and intuitive, and the amount of calculation is small. However, due to the arbitrary setting of the spring coefficient, it is difficult to quantitatively identify the pros and cons of the behavior characteristics of the simulated object.

The boundary element model reduces the dimensionality of the problem and simplifies the calculation by discretizing the model boundary, but it has certain difficulties in terms of stability

The flexible body model based on the spherical harmonic function has a predictive function, and can well express the surface contour and details of the flexible body, but the geometric complexity that the model can express has certain limitations, and the running time is long

These commonly used physical models of soft tissue deformation have problems such as complicated calculations and low simulation accuracy.

[0004] Aiming at the above problems of computational complexity and lack of simulation degree, a modeling method of cross spring model for haptic reproduction is proposed, which makes the haptic human-computer interaction process faster and more effective in the virtual surgery simulation process, and improves the immersion of the interaction Sense, realism and simulation

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