The assessment of consecutive 4D-CT scans during simulation for lung stereotactic body radiation therapy patients

• DOI: 10.2478/pjmpe-2020-0023
• Publication Date: 2021-01-13T21:00:28Z
• Authors: Milovan Savanovic; Bojan Strbac; Drazan Jaros; Jean-Noel Foulquier
• Keywords: 03 medical and health sciences; 0302 clinical medicine; 3. Good health

Abstract Purpose: To evaluate the breathing amplitude, tumor motion, patient positioning, and treatment volumes among consecutive four-dimensional computed tomography (4D-CT) scans, during simulation for lung stereotactic body radiation therapy (SBRT). Material methods: The variation shape of were evaluated 55 cancer patients after 4D-CT acquisitions, scanned at one-week intervals. impact in amplitude on motion was determined 20 patients. gross volume (GTV) contoured from a free-breathing CT scan ten phases respiratory cycle, both 4D-CTs (440 total). Results: Breathing decreased by 3.6 (3.4-4.9) mm, 3.2 (0.4-5.0) mm while period increased 4 (2-6) s, inter-scan Intra-scan times greater 5 period, 8 comparing irregular versus regular patterns Using coaching, increases 3 to 2 6 s. Differences less than 10% between scans. Patient positioning remained stable, with small difference 1.1 (0.6-1.4) mm. Conclusion: Decreasing decreases reciprocally. When decreases, inter- intra-scan, especially breathing. Coaching improves respiration, keeping initial amplitude. Contoured reproducible through successive