Development of an isocentric rotating chair positioner to treat patients of head and neck cancer at upright seated position with multiple nonplanar fields in a fixed carbon-ion beamline

Medical Physics
Xiang ZhangRong Zhou

Abstract

An isocentric rotating chair for a positioner was developed as a nongantry solution to provide multiple nonplanar radiation fields with a maximum tilt of 20 ∘ for treating head and neck cancer patients at an upright seated position in a fixed carbon-ion beamline. The preclinical validation of the chair was present for this study funded by a grant through the Shanghai Proton and Heavy Ion Center (SPHIC) in Shanghai, China. The chair was installed in SPHIC. A concept of parallel kinematic was adopted to build the chair. Three movement subunits of the chair are a Stewart hexapod platform and two modules for three-dimensional translation and 360 ∘ rotation. This chair can position patients with a tilt up to 20 ∘ over a continuous 360 ∘ rotation. Any weak structures within each subunit were investigated by industrial static/dynamic simulations of used materials. After manufactured subunits were assembled in a factory, a series of executed six degree-of-freedom (DoF) displacements were measured by using a laser-based dynamic tracking system (LDTS) for the initial validation. Deviations between measured and required displacements, referred to as displacement deviation, were used to evaluate the displacement...Continue Reading

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Citations

Apr 6, 2021·Advances in Radiation Oncology·Stewart MeinAndrea Mairani
Jul 13, 2021·Frontiers in Oncology·Jiayao SunYinxiangzi Sheng

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