title: Compensating for tumor motion by a 6-degree-of-freedom treatment couch: is patient tolerance an issue?
abstract: OBJECTIVE
  To determine whether patients could tolerate the motion of a robotic couch that compensates for breathing-induced tumor motion.
  
  
  METHODS
  A total of 10 healthy subjects and 23 radio-oncology patients underwent simulated extracranial stereotactic radiotherapy (two 30-min sessions) on a robotic couch programmed to follow a fictitious tumor trajectory of 20x5x5 mm (cranio-caudal, left-right, and anterior-posterior directions, respectively) while rotating 2 degrees around a cranio-caudal axis at a frequency of 5 seconds per loop.
  
  
  RESULTS
  No session had to be interrupted and no nausea was induced. However, one patient refused the second session due to general deterioration and not all patients could keep their arms elevated for the entire session.
  
  
  CONCLUSIONS
  Our findings showed that most patients tolerated compensatory couch motion and that motion sickness should not pose a problem in the investigation of this tumor-tracking method.
authors.affiliation: Department of Radiation Oncology, Julius-Maximilians University, Wuerzburg, Germany.
authors.forename: Reinhart A
authors.initials: RA
authors.lastname: Sweeney
authors.forename: Winfried
authors.initials: W
authors.lastname: Arnold
authors.forename: Eva
authors.initials: E
authors.lastname: Steixner
authors.forename: Meinhard
authors.initials: M
authors.lastname: Nevinny-Stickel
authors.forename: Peter
authors.initials: P
authors.lastname: Lukas
mesh_terms: D000328:Adult; D000368:Aged; D001132:Arm; D006801:Humans; D008875:Middle Aged; D009038:Motion; D009068:Movement; D009325:Nausea / Q000209:etiology; D016634:Radiosurgery / Q000295:instrumentation*; D012119:Respiration; D012371:Robotics / Q000295:instrumentation*; D014839:Vomiting / Q000209:etiology