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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

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Optical-CT imaging of complex 3D dose distributions.

Mark Oldham, Leonard Kim, Geoffrey Hugo

Journal of Physics. Conference Series

|January 20, 2007

Summary

Advanced radiation therapy needs better verification. Optical-CT gel dosimetry offers high-resolution 3D dose mapping, improving the accuracy of complex treatment verification, though further refinement is needed.

Area of Science:

Medical Physics
Radiation Oncology
Imaging Science

Background:

Conventional dosimeters have limitations in verifying advanced radiation treatments.
Rapid advancements in radiation delivery outpace verification capabilities.
High-resolution 3D dosimetry is crucial for complex radiotherapy.

Purpose of the Study:

To investigate optical-CT gel dosimetry for high-resolution 3D dose mapping.
To assess the accuracy and robustness of optical-CT for verifying intensity-modulated radiation therapy (IMRT).
To develop methods for minimizing artifacts in optical-CT imaging.

Main Methods:

Construction of a first-generation optical-CT scanner.
Application to simple and complex dose distributions, including IMRT.

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Development of physical and image processing techniques to mitigate optical effects (refraction, reflection, scattering).

Investigation using geometry and variable attenuation phantoms.

Main Results:

Optical-CT gel dosimetry provides high-resolution 3D dose maps.
Demonstrated clinical examples of 3D IMRT dosimetry verification.
Good agreement observed between planned and measured doses at high dose levels (>50%).
Systematic discrepancies (3% rms at high doses) indicate areas for improvement.

Conclusions:

Optical-CT gel dosimetry facilitates comprehensive verification of complex 3D radiation treatments.
The technique shows promise for improving radiotherapy quality assurance.
Further research is needed to eliminate confounding factors and enhance accuracy.