Analysis of Body Surface Motions during the Radiotherapy

M. Walke, N. Riefenstahl, G. Krell, B. Michaelis, and G. Gademann (Germany)


Dynamic Surface Motion, MotionAnalysis, Fast Optic Body-Contour-Scan


During a complete radiation therapy chain, the laying duration of patients at the therapy-simulator and during the radiation treatment reaches up to several minutes. Only as a first approximation, a patient is motionless during this time. But after careful analysis, different motion types contribute to the visible dynamic contour motion of the body of a patient. Within fractionated treatment series patients underlie different changes in respect to the body outline. With specially developed optical sensors (IESK) a high velocity optic scanning of the body surfaces is possible. The dynamic surface motion depends strongly on the particular patient, but also on the course of the disease, the age and the general-condition. The analysed parameters are: two-dimensional maximum differences between the reached extreme positions, two dimensional frequency components of the surface and slow time-developments of an averaged value of each surface point. Especially, the calculation of a two dimensional probability distribution for the moving surfaces can support two-dimensional alarm functions. These functions include the local information for the average motion range of each surface-point. This is the crucial prerequisite for a dynamic positioning of patients at the LINAC (linear-accelerator).

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