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Related Experiment Videos

A table top suited for CT and radiotherapy.

Klaus Bratengeier1, Walter Baur, Kurt Baier

  • 1Klinik und Poliklinik für Strahlentherapie, Universität Würzburg. Bratengeier_K@klinik.uni-wuerzburg.de

Zeitschrift Fur Medizinische Physik
|August 25, 2004
PubMed
Summary

A new carbon fiber radiotherapy table top minimizes dose distortion and CT artifacts, ensuring accurate tumor localization. This design improves patient treatment by reducing imaging interference and enhancing treatment precision.

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Area of Science:

  • Medical Physics
  • Radiotherapy Engineering
  • Materials Science

Background:

  • Accurate patient positioning and dose delivery are critical in modern radiotherapy.
  • Conventional radiotherapy table tops can introduce artifacts in diagnostic imaging, complicating treatment planning and verification.
  • Minimizing table top interference is essential for image-guided radiotherapy (IGRT) and intensity-modulated radiation therapy (IMRT).

Purpose of the Study:

  • To design and manufacture a novel radiotherapy table top compatible with in-room computed tomography (CT).
  • To ensure minimal dose distribution distortion (≤4% in small target volume subunits, ≤2% mean dose) and negligible CT artifacts.
  • To enable precise tumor localization and accurate treatment delivery in image-guided radiotherapy workflows.

Main Methods:

Related Experiment Videos

  • Design and fabrication of a carbon fiber reinforced plastic (CFRP) table top using finite-element analysis.
  • Development of a trapezoidal sandwich plate design supported by tapered beams for structural integrity and CT gantry clearance.
  • Performance evaluation through transmission measurements (18 MV and 6 MV photons) and comparison with a portal imaging device (PID).

Main Results:

  • The CFRP table top exhibited reduced deflection and torsion compared to the original table.
  • Transmission measurements showed high photon transmission (97.5% at 18 MV, 96.5% at 6 MV).
  • CT slices demonstrated only minor artifacts, preserving accurate tumor localization without restricting treatment planning.

Conclusions:

  • The designed CFRP radiotherapy table top meets stringent requirements for dose distribution accuracy and minimal imaging artifacts.
  • This innovative table top design supports advanced radiotherapy techniques, including IGRT and IMRT, by ensuring precise target volume localization.
  • The table's construction and performance offer a significant improvement for integrated CT-based radiotherapy delivery systems.