Benchmarking of a motion sensing system for medical imaging and radiotherapy

Peter J. Barnes, Clive Baldock, Steven R. Meikle, Roger R. Fulton

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)5845-5857
Number of pages13
JournalPhysics in Medicine and Biology
Issue number20
Publication statusPublished - 2008
Externally publishedYes


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