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Related Experiment Video

Updated: Jun 22, 2026

Integrating Augmented Reality Tools in Breast Cancer Related Lymphedema Prognostication and Diagnosis

Integrating Augmented Reality Tools in Breast Cancer Related Lymphedema Prognostication and Diagnosis

Published on: February 6, 2020

Accuracy in breast shape alignment with 3D surface fitting algorithms.

Marco Riboldi¹, David P Gierga, George T Y Chen

¹Department of Bioengineering, TBMLab, Politecnico di Milano University, Milano, Italy 20133. marco.riboldi@polimi.it

Medical Physics

|May 29, 2009

Summary

This summary is machine-generated.

Constrained surface fitting improves breast alignment accuracy in radiotherapy by using nipple matching. This method offers better setup accuracy than unconstrained methods, especially for whole breast positional reproducibility.

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Area of Science:

Medical Physics
Radiotherapy
Image-guided therapy

Background:

Surface imaging is crucial for patient setup and monitoring in radiotherapy.
Breast alignment relies on matching reference and daily surface shape models.
Accurate alignment is essential for effective radiotherapy delivery.

Purpose of the Study:

To quantify whole breast shape alignment using texture features on 3D surface models.
To compare a novel constrained surface fitting algorithm with commercial unconstrained methods.
To evaluate the impact of nipple matching constraints on breast alignment accuracy.

Main Methods:

Texture feature localization was validated using a silicone breast phantom and a high-precision mechanical stage.
Clinical data from 18 patients (133 fractions) treated with accelerated partial breast irradiation were analyzed.
A 3D video-based surface imaging system compensated for breathing during breast shape detection.

Main Results:

Texture feature localization accuracy was within 2 mm.
Unconstrained surface fitting showed higher nipple mismatch (3.9 mm) compared to surface distances (0.6 mm), with occasional outliers >1 cm.
Constrained surface fitting achieved average surface mismatch within 1 mm when nipple position matching was enforced within 1.5-5 mm.

Conclusions:

Balancing overall surface congruence with landmark matching (nipple position) optimizes setup accuracy.
Constrained surface fitting significantly improves breast alignment accuracy compared to unconstrained methods.
This method enhances setup accuracy for applications requiring high whole breast positional reproducibility in radiotherapy.