Using Cone Beam CT for Accurate Dose Calculation in Radiotherapy
Author Information
Author(s): Anne Richter, Qiaoqiao Hu, Doreen Steglich, Kurt Baier, Jürgen Wilbert, Matthias Guckenberger, Michael Flentje
Primary Institution: Julius-Maximilians-University, Department of Radiation Oncology, Wuerzburg, Germany
Hypothesis
To investigate the feasibility and accuracy of dose calculation in cone beam CT (CBCT) data sets.
Conclusion
Creating specific HU-D tables for different anatomical regions allows for accurate dose calculation in CBCT images without needing reference CT images.
Supporting Evidence
- CT values in CBCT images showed a mean difference of 564 HU ± 377 HU compared to planning CT.
- Using patient-specific HU-D tables resulted in small dose differences of 0.9% ± 0.9% for pelvis patients.
- The study established that a single HU-D table is insufficient for different imaging presets.
Takeaway
This study shows that we can use special tables to help calculate the right dose of radiation for patients using cone beam CT images, making treatment safer and more accurate.
Methodology
The study compared CT values from planning CT and CBCT images across different patient groups and developed correction strategies for accurate dose calculation.
Limitations
The study may not account for organ deformation and variations in patient anatomy over time.
Participant Demographics
33 patients with 11 each from pelvis, thorax, and head cancer groups.
Digital Object Identifier (DOI)
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