Abstract
IntroductionIntrafractional motion can cause substantial uncertainty in precision radiotherapy. Traditionally, the target volume is defined to be sufficiently large to cover the tumor in every position. With the robotic treatment couch, a real‐time motion compensation can improve tumor coverage and organ at risk sparing. However, this approach poses additional requirements, which are systematically developed and which allow the ideal robotic couch to be specified.Methods and materialsData of intrafractional tumor motion were collected and analyzed regarding motion range, frequency, speed, and acceleration. Using this data, ideal couch requirements were formulated. The four robotic couches Protura, Perfect Pitch, RoboCouch, and RPSbase were tested with respect to these requirements.ResultsThe data collected resulted in maximum speed requirements of 60 mm/s in all directions and maximum accelerations of 80 mm/s2 in the longitudinal, 60 mm/s2 in the lateral, and 30 mm/s2 in the vertical direction. While the two robotic couches RoboCouch and RPSbase completely met the requirements, even these two showed a substantial residual motion (40% of input amplitude), arguably due to their time delays.ConclusionThe requirements for the motion compensation by an ideal couch are formulated and found to be feasible for currently available robotic couches. However, the performance these couches can be improved further regarding the position control if the demanded speed and acceleration are taken into account as well.
Highlights
Intrafractional motion can cause substantial uncertainty in precision radiotherapy
The data collected resulted in maximum speed requirements of 60 mm/s in all directions and maximum accelerations of 80 mm/s2 in the longitudinal, 60 mm/s2 in the lateral, and 30 mm/s2 in the vertical direction
This work aimed at a systematic development of requirements for ideal treatment couches used in active motion compensation, an evaluation of current robotic couches with respect to the requirements derived, and a recommendation for modifications of current robotic couches or a new couch design for an ideal couch tracking system
Summary
Intrafractional motion can cause substantial uncertainty in precision radiotherapy. Traditionally, the target volume is defined to be sufficiently large to cover the tumor in every position. With the robotic treatment couch, a real-time motion compensation can improve tumor coverage and organ at risk sparing. This approach poses additional requirements, which are systematically developed and which allow the ideal robotic couch to be specified. Methods and materials: Data of intrafractional tumor motion were collected and analyzed regarding motion range, frequency, speed, and acceleration Using this data, ideal couch requirements were formulated. While this approach assures the tumor’s radiation dose coverage, it does
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