title: Benchmarking of a motion sensing system for medical imaging and radiotherapy.
abstract: We have tested the performance of an Optotrak Certus system, which optically tracks multiple markers, in both position and time. To do this, we have developed custom code which enables a range of testing protocols, and make this code available to the community. We find that the Certus' positional accuracy is very high, around 20 microm at a distance of 2.8 m. In contrast, we find that its timing accuracy is typically no better than around 5-10% for typical data rates, whether one is using an ethernet connection or a dedicated SCSI link from the system to a host computer. However, with our code we are able to attach very accurate timestamps to the data frames, and in cases where regularly-spaced data are not an absolute requirement, this will be more than adequate.
authors.affiliation: Institute of Medical Physics, School of Physics, University of Sydney, NSW, Australia. peterb@astro.ufl.edu
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Barnes
authors.forename: Clive
authors.initials: C
authors.lastname: Baldock
authors.forename: Steven R
authors.initials: SR
authors.lastname: Meikle
authors.forename: Roger R
authors.initials: RR
authors.lastname: Fulton
mesh_terms: D019985:Benchmarking; D003952:Diagnostic Imaging / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000295:instrumentation*; D009038:Motion; D055096:Optical Devices; D011878:Radiotherapy / Q000295:instrumentation*