International Journal of Radiation Oncology * Biology * Physics
Volume 72, Issue 1 , Pages 295-299, 1 September 2008

The Effect of Transponder Motion on the Accuracy of the Calypso Electromagnetic Localization System

  • Martin J. Murphy, Ph.D.

      Affiliations

    • Department of Radiation Oncology, Virginia Commonwealth University, Richmond, VA
    • Corresponding Author InformationReprint requests to: Martin J. Murphy, Ph.D., Department of Radiation Oncology, Virginia Commonwealth University Health System, 401 College Street, P.O. Box 980058, Richmond, VA 23298-0058. Tel: (804) 628-7777; Fax: (804) 628-4709
    • ,
  • Richard Eidens, Ph.D.

      Affiliations

    • Calypso Medical Technologies, Seattle, WA
    • ,
  • Edward Vertatschitsch, Ph.D.

      Affiliations

    • Calypso Medical Technologies, Seattle, WA
    • ,
  • J. Nelson Wright, M.S.

      Affiliations

    • Calypso Medical Technologies, Seattle, WA

Received 20 February 2008; received in revised form 12 May 2008; accepted 14 May 2008.

Purpose

To determine position and velocity-dependent effects in the overall accuracy of the Calypso Electromagnetic localization system, under conditions that emulate transponder motion during normal free breathing.

Methods and Materials

Three localization transponders were mounted on a remote-controlled turntable that could move the transponders along a circular trajectory at speeds up to 3 cm/s. A stationary calibration established the coordinates of multiple points on each transponder's circular path. Position measurements taken while the transponders were in motion at a constant speed were then compared with the stationary coordinates.

Results

No statistically significant changes in the transponder positions in (x,y,z) were detected when the transponders were in motion.

Conclusions

The accuracy of the localization system is unaffected by transponder motion.

External beam radiotherapy, Respiratory motion tracking, Electromagnetic localization

To access this article, please choose from the options below

Login to an existing account or Register a new account.

  • Purchase this article for 30.00 USD (You must login/register to purchase this article)

    Online access for 24 hours. The PDF version can be downloaded as your permanent record.

  • Subscribe to this title

    Get unlimited online access to this article and all other articles in this title 24/7 for one year.

  • Claim access now

    For current subscribers with Society Membership or Account Number.

  • Visit SciVerse ScienceDirect to see if you have access via your institution.
 

 Supported in part by National Cancer Institute grant R21CA119143.

 Conflict of interest: R.E., E.V., and J.N.W. are employees of Calypso Medical Technologies.

PII: S0360-3016(08)00926-7

doi:10.1016/j.ijrobp.2008.05.036

International Journal of Radiation Oncology * Biology * Physics
Volume 72, Issue 1 , Pages 295-299, 1 September 2008

Article Tools

* Image Usage & Resolution