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Related Experiment Video

Updated: Sep 15, 2025

A Teleoperated Robotic System-Assisted Percutaneous Transiliac-Transsacral Screw Fixation Technique

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Helical-like scan and upright CBCT imaging algorithms based on robotic-arm system.

Tong Lin¹, Tianling Lyu², Jiashun Wang¹

¹Laboratory of Image Science and Technology, Southeast University, Nanjing, China.

Medical Physics

|July 16, 2025

Summary

This study introduces a new upright reverse helical cone-beam CT (CBCT) system for enhanced medical imaging. The system offers high-quality reconstructions, improved efficiency, and reduced radiation dose for various clinical applications.

Keywords:

normalized backprojection optimal helical pitch upright position CT

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Area of Science:

Medical Imaging
Cone-Beam Computed Tomography (CBCT)
Robotic Systems

Background:

Upright position CT scans are valuable in rehabilitation medicine but face limitations.
Challenges include restricted field of view (FoV) along the Z-axis, limited acquisition angles, and floor stability issues.
Existing methods struggle with mechanical vibrations and inhomogeneous sampling in robotic CBCT.

Purpose of the Study:

To develop an algorithm for high-quality image reconstruction in lightweight robotic-arm CBCT systems.
To address challenges of mechanical vibrations, limited Z-axis scanning range, and inhomogeneous sampling.
To enable accurate imaging under realistic upright conditions with enhanced robotic capabilities.

Main Methods:

Utilized a long Z-axis helical steel ball phantom and a greedy ball-positioning algorithm for geometrical calibration.
Implemented a data completeness-driven method to optimize scanning pitch for rapid, full-body scans.
Employed a normalized projection-based FDK-style algorithm for reconstruction quality under reverse helical constraints.

Main Results:

Achieved competitive reconstruction accuracy with low RMSE values across different phantoms (Shepp-Logan, foam-like, VHP).
Demonstrated computational efficiency, outperforming iterative methods while preserving image quality.
Significantly reduced radiation dose compared to conventional helical CT, with substantial dose reductions observed.

Conclusions:

The proposed system offers a robust solution for long-length Z-axis imaging in upright, unstable, and nonstandard sampling scenarios.
The framework has potential for advancing robotic-arm upright CBCT systems.
Applications include orthopedic functional evaluations and other clinical imaging needs.