Comparison of CT on Rails With Electronic Portal Imaging for Positioning of Prostate Cancer Patients With Implanted Fiducial Markers Academic Article uri icon


  • PURPOSE: The objective of this investigation was to measure the agreement between in-room computed tomography (CT) on rails and electronic portal image (EPI) radiography. METHODS AND MATERIALS: Agreement between the location of the center of gravity (COG) of fiducial markers (FMs) on CT and EPI images was determined in phantom studies and a patient cohort. A secondary analysis between the center of volume (COV) of the prostate on CT and the COG of FMs on CT and EPI was performed. Agreement was defined as the 95% probability of a difference of


  • Owen, Rebecca
  • Kron, Tomas
  • Foroudi, Farshad
  • Milner, Alvin
  • Cox, Jennifer
  • Duchesne, Gillian
  • Cleeve, Laurence
  • Zhu, Li
  • Cramb, Jim
  • Sparks, Laura
  • Laferlita, Marcus

publication date

  • July 2009