Static-junction craniospinal irradiation: verification of the daily dose and long-term treatment results

The study was performed to evaluate the repeatability and effectiveness of the static-junctions image guided (SJIG) method of craniospinal irradiation. Material and methods. An analysis of 40 treatment plans was performed. All treatment plans were reviewed with regard to the distances between isocentres between in every single field of each fraction during all treatment days. Based on that data, second (actually treated) plans were created. The planned and treated parameters were compared. Results. The study group consisted of 40 patients irradiated in the craniospinal region. Data on 902 fractions and 1635 isocentres positions was collected. 1-, 2- and 5-year overall survival was 95%, 89% and 78%, respectively. Spine metastases were observed in regions which were covered with a homogenous dose during treatment. Conclusions. SJIG is safe and produces very good long-term outcomes. Treatment planning and delivery is simple with good reproduction of the planned dose distribution during the actual treatment.