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Updated: Jul 12, 2026

Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy

Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy

Published on: June 7, 2015

A deformable lung tumor tracking method in fluoroscopic video using active shape models: a feasibility study.

Qianyi Xu¹, Russell J Hamilton, Robert A Schowengerdt

¹Department of Electrical and Computer Engineering, University of Arizona, Tucson, AZ 85721, USA.

Physics in Medicine and Biology

|September 1, 2007

Summary

This summary is machine-generated.

This study presents a novel method for tracking deforming lung tumors using active shape models (ASM) in fluoroscopic video. This technique enables precise real-time tumor tracking for dynamic multi-leaf collimator (DMLC) radiotherapy.

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Area of Science:

Medical Physics
Radiotherapy Technology
Image-Guided Therapy

Background:

Dynamic multi-leaf collimators (DMLC) offer advanced capabilities in radiotherapy, including tracking moving targets.
Beyond translational motion, DMLC can adapt aperture shape to account for deforming tumor projections in the beam's eye view.
Accurate tracking of deforming tumors is crucial for effective real-time radiotherapy.

Purpose of the Study:

To present a method for tracking deforming lung tumors in fluoroscopic video using active shape models (ASM).
To evaluate the feasibility and precision of this ASM-based tracking method for lung tumors exhibiting deformation.
To support the development of advanced DMLC-based real-time tumor tracking systems.

Main Methods:

Utilized active shape models (ASM) to track deforming lung tumors in real-time from fluoroscopic video data.
Developed and implemented an algorithm capable of analyzing tumor deformation in the beam's eye view.
Validated the tracking accuracy by comparing automated results against expert-edited tumor contours.

Main Results:

The proposed ASM method demonstrated feasibility in precisely tracking deforming lung tumors.
Tracking results showed good agreement with manual expert delineations, indicating high accuracy.
The method successfully accounted for both tumor motion and shape deformation.

Conclusions:

The active shape model approach is a viable technique for precise real-time tracking of deforming lung tumors.
This method is essential for enhancing the efficacy of dynamic multi-leaf collimator (DMLC) radiotherapy.
Accurate tracking of deformable tumors is a critical step towards adaptive radiotherapy strategies.