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Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
Published on: June 7, 2015
Clinical implementation of target tracking by breathing synchronized delivery
Dinesh Tewatia1, Tiezhi Zhang, Wolfgang Tome
1Department of Human Oncology, University of Wisconsin, Madison, Wisconsin 53705, USA.
Medical Physics
|December 13, 2006
Summary
Breathing synchronized delivery (BSD) enables accurate tumor tracking without hardware changes. This technique guides patients to breathe with a target motion, ensuring precise radiation delivery and similar dose distributions to planned treatments.
Area of Science:
- Radiation Oncology
- Medical Physics
- Image-Guided Therapy
Background:
- Real-time target tracking in radiation therapy often requires significant hardware modifications.
- Breathing-synchronized delivery (BSD) offers an alternative by guiding patient breathing to match target motion, avoiding hardware changes.
- Four-dimensional computed tomography (4D-CT) provides essential data for understanding tumor motion during the breathing cycle.
Purpose of the Study:
- To detail the step-by-step implementation of target tracking using the BSD technique for sliding window intensity-modulated radiation therapy (IMRT).
- To evaluate the feasibility and accuracy of BSD for compensating tumor motion during radiation delivery.
- To verify the dosimetric accuracy of BSD using a mobile phantom.
Main Methods:
- Development of a breathing guide based on the patient's normal breathing pattern.
- Acquisition of 4D-CT scans and processing to obtain smoothed average tumor trajectory using deformable image registration and Fourier filtering.
- Conventional IMRT planning at the reference phase, followed by correlation of treatment delivery with breathing phase and evaluation of dynamic multileaf collimator (dMLC) parameters.
Main Results:
- Dosimetry verification using a mobile phantom demonstrated significant underdose and overdose in target regions without motion compensation.
- BSD delivery on the phantom, synchronized with beam delivery, resulted in a dose distribution highly consistent with the planned treatment.
- The technique ensures that dMLC leaf speed and acceleration are evaluated to maintain treatment delivery accuracy.
Conclusions:
- Breathing synchronized delivery (BSD) is a viable technique for target tracking in radiation therapy without requiring major hardware modifications.
- BSD effectively compensates for tumor motion, leading to accurate dose delivery comparable to static treatment plans.
- This method enhances the precision of radiation delivery for moving targets, improving treatment efficacy.
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