Akademik Veri Yönetim Sistemi
RADIOTHERAPY AND ONCOLOGY, cilt.96, 2010 (SCI-Expanded)
Purpose: Daily set-up verification with image guidance is very important for reducing treatment margins in prostate cancer patients. In this study, we aimed to determine the feasibility of incorporating a teaching intervention on soft tissue anatomy match of cone beam CT (CBCT) into the radiation therapist (RTT) re1resher courses and its contribution to RTT skills. Materials: In our clinic, kV-CBCT (kV based Cone Beam Computerized Tomography) images are being used for 3 dimensional set-up validation for first five fractions of the treatment and once or twice a week thereafter. The study schema consisted 01a baseline evaluation, the training and a follow-up assessment Twenty CBCT images of 6 prostate cancer patients were used in this study. 4 RTTs were asked to align CBCT images with treatment planning CT scans at the baseline evaluation. Afterwards, the participants attended a refresher course on prostate anatomy and radiology which consisted of seminars and practical training lectured by a diagnostic radiologist. RTTs were asked to repeat the CBCT match for follow-up evaluation Planning CT and CBCT images were also aligned by a radiation oncologist, and results were accepted as "reference value" (RV) for each patient. Vertical, lateral, and longitudinal vectors were calculated according to the set-up corrections of each RTT for all CBCTs. These values were compared with the RV and differences for pre-trainmq (RV-Apre, RV-Bpre, RV-Cpre, RV-Dpre) and post training (RVApost, RV·Bposf, RV-Cpost, RV-Dpost) were obtained. Alignment times were measured for pre- and post training and contribution of teaching intervention on set-up correction time was evaluated. RTTs were asked to complete a survey to assess the training using a 5-point Likert scale. "Two related t test" was used tor comparison. Results: For 3 of RTTs training was associated with Improved alignment (Tablel) Set-up corrections improved by 75%,65%,60% and 45%. Alignment times Improved in 2 RTTs while remained stable in the other 2. Survey assessment showed the training was useful to refresh the anatomy and radiology of prostate and contributed to the identification 01apex. Participants reported that practical trainings should be a part of refresher courses.