ESTRO 2023 - Abstract Book

S2090

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ESTRO 2023

from clinical oncologists and a radiologist. When available, use of co-registered MRIs was used to corroborate and clarify uncertain points. 5 real patient cases were then selected for each RTT to fully complete the competency.

Results Both RTTs successfully completed the 8 training cases and were permitted to commence 5 real patient cases autonomously. Both RTTs successfully complete the 5 clinical patient cases, having had the contours reviewed by the clinicians. The MDT sessions were crucial to discuss the anatomy and relevance of the structures, for understanding their purpose and accuracy of delineation. Each case was discussed in detail and queries were resolved, supporting the creation of the atlas and RTT competency. Each clinical case was peer-reviewed with the clinicians and when approved the RTT was deemed competent to undertake this task autonomously. The final responsibility lay with the clinician to check the volumes before dosimetry but valuable time was saved by allocating this task to the RTTs. Foramen rotundum (No.5, Table 1) took much consideration, but the consensus was reached in each of the training cases and helpful anatomical landmarks to identify this structure were discussed and included in the atlas. The atlas and competency documentation for RTTs were shown to be valid and were approved for departmental use. Cascade training has commenced using the atlas and the competency documents for the remaining pre-treatment RTTs. This is under the supervision of the 2 original RTTs deemed competent. Additionally, a new structure template for PBT CSI has been developed in the RTPS to further streamline this work. Conclusion Developing an atlas and competency documentation framework has enabled RTTs to volume specified CTVs and OARs for PBT CSI planning. MDT collaboration was essential for the complex interpretation of image data sets and anatomical skills. Trained RTTs are capable of delineating CTVs and OARs and training RTTs, within the scope of the atlas and agreed competency, enabling increased outlining skills for RTTs and streamlining the process within the patients’ pathway. 1 Taichung Veterans General Hospital, Department of Radiation Oncology, Taichung, Taiwan; 2 National Chung Hsing University, Institute of Biomedical Sciences, College of Life Sciences, Taichung, Taiwan; 3 Taichung Veterans General Hospital, Department of Psychiatry, Taichung, Taiwan; 4 Taichung Veterans General Hospital, Cancer Prevention and Control Center, Taichung, Taiwan Purpose or Objective In lung cancer, radiation induced lung injury (RILI), or radiation pneumonitis (RP) was our most concern issue after radiotherapy. We investigated the correlation between (1) Dose-Volume-Histogram (DVH), (2) volumes of radiation pneumonitis lesions and (3) radiation pneumonitis grades after radiotherapy. Materials and Methods We retrospectively collected patients of non-small lung cancer who underwent curative radiation dose to thorax without receiving chest radiotherapy before this treatment course. Post treatment CT images were imported into treatment planning system (TPS) to evaluate correlation of dosimetry parameters and volume of pneumonia patch by using deformable image registration. The DVH and RILI patch contour demonstrated in (Figure 1) PO-2322 A novel tool to evaluate and quantify radiation induced lung injury(RILI): volume of pneumonia patch J.W. Huang 1,2 , Y.H. Lin 1 , Y. Tuan 3 , J.F. Lin 1 , Y.W. Hsu 4 , T.N. Wei 1