Interactive posture program: a software platform for using the realistic anthropomorphic flexible phantom family in computational dosimetry applications

Boundary-representation (B-Rep) computational phantoms (CPs) offer high flexibility and anatomical accuracy, making them valuable tools in dosimetry and medical imaging simulations. However, their complexity and the need for expertise in graphic modelling limit their accessibility and adoption. Moreover, most Monte Carlo (MC) particle transport codes lack native support for B-Rep geometries, requiring complex and non-automated conversion to compatible formats, further complicating their use. To address these challenges, we developed the interactive posture program (IPP), a software platform to ease the use of B-Rep phantoms. The IPP features a real-time three-dimensional (3D) graphical interface, allowing users to easily create individualised phantoms and realistic exposure scenarios. Currently, the IPP includes three flexible phantoms-Adult Male, Adult Female, and 1-year-old Female-from the realistic anthropomorphic flexible (RAF) family, which can be extensively customised using integrated morphing tools to simulate diverse anatomical variations. Additionally, the IPP provides a comprehensive library of predefined exposure scenarios and advanced geometry creation tools, which allow the creation of accurate and individualised simulations. Finally, the IPP automatically generates simulation input files compatible with the most widely used MC transport codes, significantly simplifying the use of B-Rep phantoms within dosimetry and imaging simulations.