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Design optimization of MR-compatible rotating anode x-ray tubes for stable operation.

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  • 1Department of Radiology, Stanford University, Stanford, California 94305 and Department of Mechanical Engineering, Stanford University, Stanford, California 94305.

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Summary

This study developed a validated 3D finite element method (FEM) model for an x-ray tube motor designed for hybrid x-ray/MR systems. Modifications to design parameters successfully increased the fundamental frequency, ensuring stable operation in the MR environment.

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Area of Science:

  • Medical Imaging Physics
  • Mechanical Engineering
  • Biomedical Engineering

Background:

  • Hybrid x-ray/MR systems offer enhanced diagnostic and treatment capabilities for various disorders.
  • Conventional x-ray tubes face operational challenges near MR systems due to fringe field interference.
  • A novel x-ray tube motor prototype designed for MR environments requires dynamic characteristic analysis for stability and safety.

Purpose of the Study:

  • To develop and validate a 3D finite element method (FEM) model for a novel x-ray tube motor.
  • To analyze the motor's dynamic characteristics and identify potential mechanical failure modes.
  • To optimize the motor design for stable and safe operation in the MR environment.

Main Methods:

  • Experimental measurement of resonance characteristics using angular speed curves and power spectrum analysis.
  • Development of a 3D FEM model, with bearing stiffness estimated by matching simulation results to experimental data.
  • Parametric sweep of design variables (bearing stiffness, shaft diameter, rotor diameter, motor length) using the validated FEM model.

Main Results:

  • The prototype motor exhibited significant vibration at 21.64 Hz, with acceleration decreasing at 21.5 Hz.
  • The FEM model, validated against experimental data (within 6.4% error), predicted a critical speed of 21.4 Hz with a bearing stiffness of 1.2 × 10^5 N/m.
  • Design modifications, including increased bearing stiffness and shaft diameter, achieved a fundamental frequency of 68.5 Hz, enabling stable operation above 50 Hz.

Conclusions:

  • A validated 3D FEM model for the x-ray tube motor was successfully implemented and experimentally confirmed.
  • Modifying design parameters allows for achieving a fundamental frequency above the operational speed, ensuring motor stability in the MR environment.
  • The validated FEM model serves as a tool for further optimization of motor design, balancing torque, speed, and inertia.