Related Experiment Video
Updated: May 26, 2026
08:17
Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
Published on: June 7, 2015
Use of weekly 4DCT-based ventilation maps to quantify changes in lung function for patients undergoing radiation
Yevgeniy Y Vinogradskiy1, Richard Castillo, Edward Castillo
1Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA. yevgeniy.vinogradskiy@ucdenver.edu
Medical Physics
|January 10, 2012
Summary
Ventilation maps from four-dimensional computed tomography (4DCT) show that lung ventilation improves when lung cancer tumors shrink during radiation therapy. Tumor presence significantly reduces pretreatment lung ventilation.
Area of Science:
- Pulmonary imaging and radiation oncology.
- Quantitative analysis of lung ventilation dynamics.
Background:
- Radiation therapy for lung cancer requires precise targeting to minimize damage to healthy lung tissue.
- Understanding how lung ventilation changes during treatment is crucial for optimizing radiation delivery and predicting outcomes.
Purpose of the Study:
- To develop and apply a method for calculating ventilation maps from four-dimensional computed tomography (4DCT) images.
- To investigate changes in lung ventilation throughout radiation therapy using these maps.
- To correlate ventilation changes with radiation dose and tumor volume reduction.
Main Methods:
- Generation of quantitative ventilation maps from weekly 4DCT data using deformable registration and a density-change-based model.
- Analysis of ventilation in regions of interest (ROIs) defined by radiation dose (V(20)) and lung lobe.
- Tracking weekly ventilation changes and calculating linear fit slopes to assess ventilation trends.
Main Results:
- No consistent pattern of ventilation change was observed as a function of radiation dose.
- Pretreatment ventilation was significantly lower in lung lobes containing tumors (39%) compared to lobes without tumors (54%).
- Ventilation increased in lobes where tumor volume decreased during treatment, while lobes with stable tumors showed no significant ventilation change.
Conclusions:
- Lung cancer tumor shrinkage during radiation therapy leads to increased ventilation in affected lung lobes.
- Tumor presence, particularly airway occlusion, significantly impairs pretreatment lung ventilation.
- Ventilation changes are more closely linked to tumor volume dynamics than to radiation dose distribution alone.
