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Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy

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Three-dimensional Conformal Radiation Planning Study for Limited-stage Small-cell Lung Cancer.

Yukinori Okada¹, Tatsuhiko Zama¹, Tomohiro Itonaga¹

¹Department of Radiology, Tokyo Medical University, Tokyo, Japan.

Cancer Diagnosis & Prognosis

|March 4, 2026

Summary

The analytical anisotropic algorithm (AAA) with point prescription may underestimate radiation dose for limited-stage small-cell lung cancer. Volume-based prescription and Boltzmann transport calculations offer more robust dose evaluation.

Keywords:

Boltzmann transport Limited-stage small-cell cancer analytical anisotropic algorithm chemotherapy radiation three-dimensional conformal radiation

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Area of Science:

Medical Physics
Radiation Oncology

Background:

Limited-stage small-cell lung cancer (SCLC) treatment involves radiotherapy.
Accurate dose calculation is crucial for effective radiation therapy.

Purpose of the Study:

To compare dose distribution variations between the analytical anisotropic algorithm (AAA) and Boltzmann transport equation.
To evaluate differences between point and volume prescriptions in 3D conformal radiotherapy for SCLC.

Main Methods:

Retrospective analysis of 22 limited-stage SCLC patients treated with radiotherapy.
Dose evaluation using AAA and Boltzmann transport equation with point and volume prescriptions.
Analysis of dose-volume relationships for Gross Tumor Volume (GTV), Clinical Target Volume (CTV), and Planning Target Volume (PTV).

Main Results:

The AAA point-prescription method showed a tendency to underestimate target dose compared to other methods.
Boltzmann transport calculations and volume-based prescriptions demonstrated more consistent dose-volume behavior.
Significant correlations were observed between target volumes and mean doses, varying by calculation method and prescription type.

Conclusions:

The AAA point-prescription approach is not recommended for dose calculation in 3D conformal radiotherapy for limited-stage SCLC.
Volume-based prescription and Boltzmann transport calculations provide more reliable dose assessment.
Further studies are warranted to optimize radiotherapy planning for SCLC.