PMID: 9531383Apr 8, 1998Paper

Electronic portal imaging with on-line correction of setup error in thoracic irradiation: clinical evaluation

International Journal of Radiation Oncology, Biology, Physics
J Van de SteeneG Storme

Abstract

To analyze setup errors and the feasibility of their on-line correction using electronic portal imaging in the irradiation of lung tumors. Sixteen patients with lung cancer were irradiated through opposed anteroposterior fields. Localization images of anteroposterior fields were recorded with an electronic portal imaging device (EPID). Using an in-house developed algorithm for on-line comparison of portal images setup errors were measured and a correction of table position was performed with a remote couch control prior to treatment. In addition, residual errors were measured on the EPID verification image. Global and individual mean and standard deviation of setup errors were calculated and compared. The feasibility of the procedure was assessed measuring intra- and interobserver variability, influence of organ movement, reproducibility of error measurement, the extra time fraction needed for measuring and adjusting and the fraction of dose needed for imaging. In two setups the procedure could not be finished normally due to problems inherent to the procedure. The reproducibility, intraobserver variability, and influence of organ movements were each described by a distribution with a mean value less than or equal to 1 mm and a...Continue Reading

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