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From a computer science viewpoint, a surgical domain model needs to be aconceptual one incorporating both behavior and data. It should therefore modelactors, devices, tools, their complex interactions and data flow. To captureand model these, we take advantage of the latest computer vision methodologiesfor generating 3D scene graphs from camera views. We then introduce theMultimodal Semantic Scene Graph (MSSG) which aims at providing a unifiedsymbolic, spatiotemporal and semantic representation of surgical procedures.This methodology aims at modeling the relationship between different componentsin surgical domain including medical staff, imaging systems, and surgicaldevices, opening the path towards holistic understanding and modeling ofsurgical procedures. We then use MSSG to introduce a dynamically generatedgraphical user interface tool for surgical procedure analysis which could beused for many applications including process optimization, OR design andautomatic report generation. We finally demonstrate that the proposed MSSGscould also be used for synchronizing different complex surgical procedures.While the system still needs to be integrated into real operating rooms beforegetting validated, this conference paper aims mainly at providing the communitywith the basic principles of this novel concept through a first prototypalpartial realization based on MVOR dataset.

Multimodal Semantic Scene Graphs for Holistic Modeling of Surgical Procedures