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Dose calculation errors due to inaccurate representation of heterogeneity correction obtained from computerized
Greg Williams1, Matthew Tobler, David Gaffney
1Department of Radiation Oncology, University of Utah Health Sciences Center, Salt Lake City, UT 84070, USA. greg.williams@hsc.utah.edu
Summary
Computerized tomography (CT) artifacts from contrast media, dental work, and air patterns can cause errors in radiation therapy dose calculations. Understanding these CT imaging issues is crucial for accurate treatment planning.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiological Imaging
Background:
- Computerized tomography (CT) is integral to radiation therapy planning, particularly for dose calculations.
- Advanced algorithms like voxel raytrace use CT Hounsfield numbers for inhomogeneity corrections.
Purpose of the Study:
- To evaluate potential errors in radiation therapy isodose calculations due to artifacts in CT imaging.
- To highlight the impact of contrast media, dental work, and air patterns on dose calculation accuracy.
Main Methods:
- Analysis of CT imaging artifacts and their influence on voxel raytrace algorithms.
- Discussion of patient-specific factors affecting CT density assessment.
- Evaluation of methods to minimize calculation errors.
Main Results:
- Artifacts from contrast media, dental work, radiopaque markers, and variable air patterns can lead to inaccurate density assessment.
- These inaccuracies can cause overestimation or underestimation of radiation dose.
- Voxel raytrace calculations, especially with couch angle adjustments, are susceptible to these errors.
Conclusions:
- Awareness of CT artifacts is essential for radiation therapists to mitigate dose calculation errors.
- Understanding the impact of these artifacts improves the accuracy and safety of radiation therapy planning.
- Strategies for minimizing errors and potential solutions are critical for clinical application.