A Prospective Evaluation of the Informational Content of Setup Verification Images for Patients Receiving Breast Radiation Therapy Tangentially With or Without Supraclavicular Treatment
Accurate patient positioning is critical in Radiation Therapy. Electronic imaging is used
to compare a patient's actual treatment position, with that which was planned from an
initial CT scan. Radiation Therapists compare planned and actual images using analysis
software to determine if differences are within acceptable tolerances. At the VIC, we use 3
different breast imaging protocols depending on the patient set-up and treatment technique.
Findings from our recent retrospective planning study show that our current electronic
imaging protocols miss some clinically significant patient set-up errors, particularly in
the medial/lateral direction, and that these errors can be better detected with the use of
an anterior image. The purpose of this study is to test these findings prospectively in
clinical practice, through the direct comparison of our current protocols with a proposed
new protocol, which would include an anterior electronic portal image (EPI).
Endpoint Classification: Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Diagnostic
To measure the difference in accuracy of a breast imaging protocol that includes a large anterior EPI in detecting set-up errors outside of tolerance as compared to the current standard breast imaging protocols.
Will be measured on days 1, 2 and 3 of radiation therapy and possibly day 4 if adjustments of the EPI where required.
British Columbia Cancer Agency
Canada: Ethics Review Committee