SU‐FF‐J‐114: Simultaneous Amplitude Monitoring for a Phase‐Based External Surrogate System by Using Stereo Cameras in Respiratory Gated Radiation Treatment

Y. Park, C. Choi, J. Park, J. Kim, H. Kim, Y. Choi, S. ye

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: A patient's amplitude of respiratory motion cannot be monitored simultaneously in phase‐based respiratory gated radiation treatment (RGRT) using RPM (Real‐time Position Management System, Varian). A novel method was developed to independently monitor amplitude of a phase based RGRT patient by using a stereo camera system. Method and Materials: A phantom oscillated regularly with an amplitude of 3.5 cm in anterior‐posterior direction and a respiratory period of 7.3 sec. Ten phase image sets of the motion phantom were acquired from a 4D‐CT scanner equipped with an external surrogate marker. Sagittal DRRs were reconstructed to register external contour of the phantom in an order of phases. A stereo camera system of two CCD cameras and a line laser marker were synchronized with the RPM system and then acquired amplitude information of the phantom in a treatment room. The amplitude of the phantom monitored by the stereo camera system was compared in real‐time with the pre‐registered body contour of the sagittal DRRs. Results: The customized stereo camera system with an aid of a developed computer program calculated phantom amplitudes in a rate of 0.22 sec/frame. The motion of the phantom was displayed in real‐time with sagittal DRRs of corresponding respiratory phase. During four respiratory cycles, the average difference between monitored and pre‐registered amplitude in 8 cm length' ROI was 0.30 ±0.16 cm. Conclusion: The developed stereo camera system that provides amplitude information can effectively monitor phase based respiration gated treatment in real time.

Original languageEnglish (US)
Pages (from-to)2502
Number of pages1
JournalMedical physics
Volume36
Issue number6
DOIs
StatePublished - Jun 2009
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

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