A novel method to correct for pitch and yaw patient setup errors in helical tomotherapy

Sarah A. Boswell, Robert Jeraj, Kenneth J. Ruchala, Gustavo H. Olivera, Hazim A. Jaradat, Joshua A. James, Alonso Gutierrez, Dave Pearson, Gary Frank, T. Rock Mackie

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


An accurate means of determining and correcting for daily patient setup errors is important to the cancer outcome in radiotherapy. While many tools have been developed to detect setup errors, difficulty may arise in accurately adjusting the patient to account for the rotational error components. A novel, automated method to correct for rotational patient setup errors in helical tomotherapy is proposed for a treatment couch that is restricted to motion along translational axes. In tomotherapy, only a narrow superior/inferior section of the target receives a dose at any instant, thus rotations in the sagittal and coronal planes may be approximately corrected for by very slow continuous couch motion in a direction perpendicular to the scanning direction. Results from proof-of-principle tests indicate that the method improves the accuracy of treatment delivery, especially for long and narrow targets. Rotational corrections about an axis perpendicular to the transverse plane continue to be implemented easily in tomotherapy by adjustment of the initial gantry angle.

Original languageEnglish (US)
Pages (from-to)1630-1639
Number of pages10
JournalMedical physics
Issue number6
StatePublished - Jun 2005
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging


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