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Advisor(s)
Abstract(s)
Head immobilization thermoplastic masks for radiotherapy purposes involve a distressful modeling procedure for the patient. To assess the possibility of using different acquisition and reconstruction methods to obtain a 3D skin surface model of PIXY-phantom-head and to present a proposal of an alternative head immobilization mask prototype. Phantom head geometry acquisitions using: computed tomography (reconstructed with ImageJ and Osirix); and 3D Laser Scanner (reconstructed with SolidWorks). From these reconstructed surface models, a set of landmarks was measured and subsequently compared with physical measurements obtained with a Rosscraft-Calliper. For statistical evaluation, relative deviations graphics and Friedman-test for non-parametrical paired samples were used, with a significance level of 5%. For a first assessment of the proposed mask performance, a radiotransparent material was considered, the strength and stiffness evaluation is performed using the finite element method. There are small differences between all the acquisitions and reconstructions methods and the physical measurements, statistically significant differences (X2F(6)) = 6.863, p=0.334) were not found. The proposed mask performed well from the strength and stiffness perspectives, leading to the desired immobilization aim. The immobilization mask design proposal may be an effective alternative to the present completely hand-made situation, which presents a high degree of discomfort and stress to the patients.
Description
Projeto IPL/2016/SoftImob/ISEL; Projeto IPL/2016/CardiaCor_ESTeSL; Projeto LAETA_UID/EMS/50022/2019.
Keywords
3D surfaces scanning Computed tomography Computational modelling of head surface Immobilisation mask prototype Mask’ mechanical behaviour IPL/2016/SoftImob/ISEL IPL/2016/CardiaCor_ESTeSL LAETA_UID/EMS/50022/2019
Citation
Loja MAR, Sousa E, Vieira L, Costa DM, Craveiro DS, parfait R, et al. Using 3D anthropometric data for the modelling of customised head immobilisation masks. Comput Methods Biomech Biomed Eng Imaging Vis. 2019;7(4):428-37.
Publisher
Taylor & Francis