A Surface Unfolding Method for Bolus Shaping Using the Mass-spring Model

Bolus is commonly used in high-energy radiotherapy to cover the patient surface in treatment. The existing method of bolus shaping is mainly a manual process that is time-consuming and lack of accuracy. A triangular mesh surface unfolding method is introduced in this research for bolus shaping to improve the accuracy. Triangle crossings are applied to reduce the number of iterations in the process of unfolding a complicated mesh surface. A mass-spring model with crossed springs is proposed to optimize initial 2D patches to reduce errors between the initial 3D surface and 2D patches. A disturbing spring is added into the massspring model to correct the deformation in the bolus shape and contour to improve the accuracy and efficiency in the optimal search. A hemisphere model and multipatches nose model are used to verify the proposed methods. Results show that the proposed method is feasible and efficient in bolus shaping.

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