TY - JOUR
AU1 - Ullman, Karen
AU2 - Ning, Holly
AU3 - Susil, Robert
AU4 - Ayele, Asna
AU5 - Jocelyn, Lucresse
AU6 - Havelos, Jan
AU7 - Guion, Peter
AU8 - Xie, Huchen
AU9 - Li, Guang
AU1 - Arora, Barbara
AU1 - Cannon, Angela
AU1 - Miller, Robert
AU1 - Norman Coleman, C
AU1 - Camphausen, Kevin
AU1 - Ménard, Cynthia
AB - Background: We sought to determine the intra- and inter-radiation therapist reproducibility of a previously established matching technique for daily verification and correction of isocenter position relative to intraprostatic fiducial markers (FM). Materials and methods: With the patient in the treatment position, anterior-posterior and left lateral electronic images are acquired on an amorphous silicon flat panel electronic portal imaging device. After each portal image is acquired, the therapist manually translates and aligns the fiducial markers in the image to the marker contours on the digitally reconstructed radiograph. The distances between the planned and actual isocenter location is displayed. In order to determine the reproducibility of this technique, four therapists repeated and recorded this operation two separate times on 20 previously acquired portal image datasets from two patients. The data were analyzed to obtain the mean variability in the distances measured between and within observers. Results: The mean and median intra-observer variability ranged from 0.4 to 0.7 mm and 0.3 to 0.6 mm respectively with a standard deviation of 0.4 to 1.0 mm. Inter-observer results were similar with a mean variability of 0.9 mm, a median of 0.6 mm, and a standard deviation of 0.7 mm. When using a 5 mm 
TI - Intra- and inter-radiation therapist reproducibility of daily isocenter verification using prostatic fiducial markers
JF - Radiation Oncology
DO - 10.1186/1748-717X-1-2
DA - 2006-02-28
UR - https://www.deepdyve.com/lp/springer-journals/intra-and-inter-radiation-therapist-reproducibility-of-daily-isocenter-oeoLwcDWmb
SP - 1
EP - 6
VL - 1
IS - 1
DP - DeepDyve
ER -