Abstract
Inter- and intra-fraction positional uncertainty of prostate patients immobilized with rectal balloons was assessed by offline analysis of consecutive daily kV CBCT. Patients were divided into two groups characterized by setup scenario: (1) using 3 fiducial skin marks; and (2) using real-time 3D surface imaging (AlignRT, VisionRT Inc). It is the first study to evaluate prostate setup errors using a rectal balloon for immobilization and surface imaging for setup guidance.
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