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Related Experiment Video

Updated: Jul 1, 2026

Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy

Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy

Published on: February 17, 2023

An on-line replanning scheme for interfractional variations.

Ergun E Ahunbay¹, Cheng Peng, Guang-Pei Chen

¹Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA.

Medical Physics

|September 10, 2008

Summary

A new online adaptive replanning strategy using segment aperture morphing (SAM) and segment weight optimization (SWO) allows for rapid adjustments in radiation therapy. This method corrects for anatomical changes in real-time, matching the effectiveness of full reoptimization within minutes.

Related Experiment Videos

Last Updated: Jul 1, 2026

Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy

Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy

Published on: February 17, 2023

Area of Science:

Radiation Oncology
Medical Physics
Image-Guided Therapy

Background:

Online adaptive replanning is crucial for correcting interfraction anatomic changes in radiation therapy.
Current full replanning techniques are too time-consuming for practical clinical implementation.

Purpose of the Study:

To present a novel, rapid online replanning strategy for real-time correction of interfraction anatomic changes.
To evaluate the efficacy and speed of the proposed SAM-SWO scheme.

Main Methods:

A three-step process: semiautomatic contour delineation, online segment aperture morphing (SAM), and optional segment weight optimization (SWO).
The scheme was tested on direct-aperture-based intensity-modulated radiation therapy (IMRT) for prostate and abdomen cases.

Main Results:

The SAM-SWO scheme achieved dose-volume histograms comparable to full reoptimization.
SAM alone sufficed for minor deformations; SAM and SWO were needed for significant deformations.
Both SAM and SWO completed within 1 minute, with the overall process under 10 minutes.

Conclusions:

The SAM-SWO scheme offers a practical and rapid alternative to full replanning for online adaptive radiotherapy.
This approach enables dose-guided radiotherapy by efficiently adapting to daily anatomical variations.