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Development of a quantitative analysis method for assessing patient body surface deformation using an optical surface
Kimihiko Sato1,2, Takayuki Kanai3, Sung Hyun Lee1
1Department of Heavy Particle Medical Science, Yamagata University Graduate School of Medical Science, 2-2-2 Iidanishi, Yamagata, 990-9585, Japan.
Radiological Physics and Technology
|August 30, 2022
Summary
This study introduces a novel optical surface tracking method to precisely measure body shape changes during radiotherapy. This technique accurately quantifies surface deformation, aiding in treatment plan adjustments without extra radiation exposure.
Area of Science:
- Medical Physics
- Radiation Oncology
- Image Analysis
Background:
- Accurate assessment of patient body shape changes during radiotherapy is crucial for maintaining treatment precision.
- Existing methods for monitoring deformation may involve additional radiation exposure or lack quantitative analysis.
Purpose of the Study:
- To develop and validate a non-invasive optical surface tracking method for quantitative analysis of body shape changes in radiotherapy patients.
- To assess the impact of surface deformation on dose distribution in Volumetric Modulated Arc Therapy (VMAT).
Main Methods:
- Utilized an optical surface tracking system to capture surface images of 3D-printed phantoms simulating patient anatomy.
- Developed a deformation surface area histogram and calculated Def-2cm² (near-maximum deformation over 2 cm²).
- Recalculated VMAT dose distribution on post-treatment phantoms to evaluate dose indices and analyzed clinical patient data.
Main Results:
- The method demonstrated high accuracy with a mean deformation error of 0.08 mm using a cubic phantom.
- Head and neck phantoms showed a Def-2cm² of 17.5 mm, and VMAT dose coverage decreased by 11.7%, indicating deformation impacts dose distribution.
- Clinical data revealed no clinically significant deformation, but observed minor skin sagging and respiratory motion.
Conclusions:
- The developed optical surface tracking method provides accurate and quantitative evaluation of body surface deformation.
- This technique has the potential to inform treatment plan modifications in radiotherapy, improving patient outcomes.
- Monitoring subtle surface changes can enhance the precision and safety of radiation delivery.
