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Quantifying construction vibration effects on daily radiotherapy treatments.

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Summary

Construction vibrations from a new hospital parkade exceeded linear accelerator specifications. Mitigation strategies were implemented to protect sensitive radiotherapy equipment during the project.

Keywords:
constructionlinear acceleratorsvibration

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Area of Science:

  • Civil Engineering
  • Medical Physics
  • Construction Management

Background:

  • A hospital campus underwent construction to replace a two-story parkade with a four-story structure.
  • The new parkade's construction site was in close proximity to a radiotherapy department housing nine linear accelerators.
  • Deep foundation pilings were installed, potentially inducing ground vibrations.

Purpose of the Study:

  • To assess the impact of construction-induced vibrations on sensitive linear accelerator equipment.
  • To measure vibration amplitude and frequency near the radiotherapy department.
  • To determine if construction vibrations exceeded acceptable limits for radiotherapy equipment operation.

Main Methods:

  • Vibration monitoring was conducted in the simulation and treatment vaults of the radiotherapy department.
  • Vibration amplitude and frequency data were collected during piling installation.
  • Vendor specifications for linear accelerator vibration tolerance were used for comparison.

Main Results:

  • Significant vibrations were detected within the radiotherapy department's vaults during construction.
  • Calculated total vibratory amplitude of the linear accelerators exceeded vendor-supplied specifications.
  • The measured vibrations posed a risk to the operational integrity of the radiotherapy equipment.

Conclusions:

  • Construction activities for the new parkade generated vibrations that negatively impacted the radiotherapy department.
  • Exceeding vibration specifications necessitated modifications to the construction process.
  • Effective communication and collaboration between project management and stakeholders were crucial for addressing the issue.