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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
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The compacting factor test is a method used to assess the workability of concrete. It is  especially suitable for concrete mixes containing aggregates up to one and a half inches in size. This test involves specialized equipment consisting of two truncated cone-shaped hoppers and a cylinder, all with polished interior surfaces to minimize friction.
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Spatial Position Measurement System for Surgical Navigation Using 3-D Image Marker-Based Tracking Tools With Compact

Zhencheng Fan, Guowen Chen, Junchen Wang

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    Summary

    This study introduces a 3-D image marker tracking system for minimally invasive surgery navigation. The system accurately measures spatial position, aiding surgeons in complex procedures within limited spaces.

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    Area of Science:

    • Medical Imaging
    • Surgical Navigation
    • Robotics

    Background:

    • Minimally invasive surgery (MIS) requires precise instrument tracking.
    • Existing navigation systems face challenges in confined surgical spaces.

    Purpose of the Study:

    • To develop and evaluate a novel spatial position measurement system for MIS.
    • To enhance surgical navigation accuracy and efficiency using 3-D image marker-based tracking tools.

    Main Methods:

    • Generation of 3-D image markers with encoded spatial information.
    • Design and analysis of tracking tools utilizing these 3-D markers.
    • Development of a pattern analysis-based positional measurement algorithm.
    • Implementation of patient-image registration and a navigation interface.

    Main Results:

    • The system demonstrates accuracy and effectiveness in spatial position measurement.
    • Theoretical spatial errors are primarily influenced by the distribution of 3-D markers.
    • Surgical navigation feasibility studies confirmed the system's potential.

    Conclusions:

    • The proposed compact tracking tools provide essential spatial positional information for MIS.
    • The system offers intuitive and accurate assistance to surgeons in limited surgical environments.