ESTRO 2020 Abstract book

S734 ESTRO 2020

patients were able to keep their initial positions during the whole process which was 1.5-3 hours long. Interruption of treatment or preparation as a result of technical reasons (patient discomfort, unintended applicator movement, transportation) did not occur. Only 1 of the 16 patients developed significant post-treatment bleeding which required further gynaecological care. Conclusion The modular treatment table made it possible to keep the same treatment position during preparation, imaging and brachytherapy treatments. It yielded maximum patient safety, almost identical anatomical situation, more accurate image registration and contouring, protection of high risk organs, minimal early and late side effects, higher quality assurance, as well as quality-of-life improvements. PO-1301 Success factors of innovation implementation in radiotherapy: building a prediction model. R. Swart 1 , M. Jacobs 2 , C. Roumen 1 , R. Houben 1 , F. Koetsveld 3 , L. Boersma 1 1 Maastro, Department of Radiation Oncology Maastro- GROW School for Oncology and Developmental Biology- Maastricht University Medical Centre+- Maastricht- The Netherlands, Maastricht, The Netherlands ; 2 Maastro, Department of Radiation Oncology Maastro- Department of Management- Tilburg University, Tilburg, The Netherlands ; 3 The Netherlands Cancer Institute, Department of Radiation Oncology- The Netherlands Cancer Institute- Amsterdam- The Netherlands., Amsterdam, The Netherlands Purpose or Objective The improvement of radiotherapy treatment depends largely on the effective implementation of innovations. However, innovation projects are often accompanied by hurdles and delay. Therefore, it is crucial to gain more insights in success factors for innovation implementation. The aim of this study is to develop a prediction model for successful innovation implementation in radiotherapy that can be used to manage innovation projects more effectively. Material and Methods Semi-structured interviews were performed in two large academic radiotherapy centres to make an inventory of all innovation projects executed between 2011-2017. The semi-structured interviews included questions about: 1) the size of the project (hours spent on the project, number of project members and number of disciplines involved), 2) the success of the project (timely, delayed or not completed) and 3) presence of pre-defined success factors, which were based on a systematic literature review. To investigate whether different success factors play a role for different types of innovation, cross tables, Chi-square tests and t-tests were used for analysing the data. A successful implementation was defined as timely implementation on a binary scale yes/no. For the prediction model, a multivariate logistic regression technique was used. Results From the 163 innovation projects (45% technological, 22% organisation and 33% treatment innovations), that were included in the analyses, only 54% was successfully implemented as planned. Compared to technological innovations, treatment innovations are 4 times less likely to be successfully implemented (p=0,004). We found 8 main success factors in literature, with 31 subcategories. All success factors were scored on a binary scale, yes/no. In our study, 16 of the subcategories of success factors showed a significant impact on successful implementation, e.g. leadership, teamwork, and integration researchers and clinicians. The prediction model contained the following determinants: 1) sufficient and competent employees, 2) complexity, 3) understanding/awareness of the project goals and process by employees, 4) feasibility and desirability (table 1). The Area Under the Curve (AUC)

questions on MR-related complaints and also assessed aspects of active patient participation. Results The most commonly treated anatomical sites were nodal metastases and liver lesions. The mean treatment time was 34 minutes with a mean beam on time of 2:17 min. Gated stereotactic body radiotherapy (SBRT) was applied in 47% of all patients. Overall, patients scored MRgRT as positive or at least tolerable in the PRO-Q. Almost two-third of patients (65%) complained about at least one item of the PRO-Q (score ≥ 4), mainly concerning coldness, paresthesia and uncomfortable positioning. All patients reported on high levels of satisfaction with their active role using the video feedback system in breath-hold delivery. Conclusion MRgRT was successfully implemented in our clinic and well tolerated by all patients, despite general MR-related complaints as well as complaints about uncomfortable immobilization. Prospective clinical studies are in development for further evaluation of MRgRT and for quantification of the benefit of MR-guided on-table adaptive radiotherapy. PO-1300 Manufactured 3D imaging treatment table for image-guided brachytherapy J. Papp 1,2 , M. Simon 1,2 , E. Csiki 1 , I. Törő 1 , Á. Kovács 1,2 1 University of Debrecen, Clinic of Oncoradiology, Debrecen, Hungary ; 2 University of Pécs, Faculty of Health Sciences- Doctoral School of Health Sciences, Pécs, Hungary Purpose or Objective Our aim was to introduce our custom-made treatment table used for CT-guided brachytherapy. The additional features make the table suitable for intracavitary treatments and interstitial brachytherapy based on sectional imaging performed in treatment position. Material and Methods Between September 2018 and August 2019, a total of 96 patients were treated on the treatment table in a total of 232 fractions. 16 of these patients received volumetric image-guided treatment in 45 fractions, 12 patients underwent intrauterine procedures, and 4 patients had interstitial brachytherapy in 12 fractions. The target volume was determined on CT scans fused with MRI. For each fraction, CT scan was done in treatment position, during which the unique features of the therapeutic table helped patients maintaining their position. The electrically adjustable table can also be combined with various additional elements. It is highly convenient for patient positioning, inserting, securing the applicators and transferring the patient to the imaging room. It is easy to transfer the patient to and from the examination table, while maintaining the patient’s treatment position. It was necessary that the applicators could be fixed firmly to the table. The table needed to have an X-ray translucent section that enables complete and unimpeded fluoroscopy to make conventional 2D orthogonal radiographic images in the treatment room with a C-arm. Furthermore, motorized height adjustment, battery and wireless operation had to be available. Portable, high mobility, lockable wheels, hand and foot operated controls were necessary as well. The extension of the table top had sliding rails, 360-degree adjustable knee and foot support with ball joint which enables patient transfer without position change. Disinfectable ergonomic table top with fixing straps was also a requirement. Finally, removable transfer rails were made to move the patient onto the examination couch while maintaining treatment position. Results By using the developed method, we were able to prevent high-grade side effects, even when delivering high curative doses. 16 patients in 45 fractions were transferred to the CT couch for image guided brachytherapy. In all cases the