An Accuracy Analysis of Tumor Tracking Algorithm According to Types of Respiration

摘要

Purpose: In this study, derived type the optimal patient breathing through the precision analysis of tumor tracking algorithm in accordance with the respiratory type was applied to the Cyber-Knife SynchronyTM respiratory tumor tracking therapy. Methods: For the measurement, by End to End measurement method program of Cyber-Knife manufacturer using Dynamic Thorax and Gafchromic Film, Treatment Targeting Error (TTE) and Superior/Inferior Direction Error (SIDE) were analyzed at 90% and 95% dose thresholds, respectively. Results: 90% TTE in the Respiratory group I (regular) is 0.86±0.18 ～ 1.67±0.12, SIDE is -1.4±0.18 ～ -0.32±0.13, 95% error range of TTE is 1.05±0.19 ～ 2.34 ± 0.23, SIDE is -2.09±0.17 ～ 0.3±0.24. In the Respiration group II to stop (Hold) for aerobic respiration in 90% error range of TTE is 1.5±0.04 ～ 2.02±0.19, SIDE is -0.1±0.31 ～ 1.57±0.1. 95% error range of TTE is 1.31±0.13 ～ 2.33±0.13, SIDE is -0.05±0.34 ～ 1.67±0.2. In addition, in the Respiration group III (SI/RE) 90% error range of TTE is 1.29±0.39 ～ 2.32±0.24, SIDE is -1.31±0.18 ～ 1.2±0.21, 95% error range of TTE is 1.37±0.26 ～ 3.17±0.19, SIDE is -1.79±0.24 ～ 1.28±0.25. Conclusion: Patients should fully understand of the importance for a stable respiration and are well-informed of respiration prior to a 4-D CT scan and radiation therapy, and it is judged that it is very important to do tumor-tracking radiation therapy, After training them in respiration so that they come near to Respiration group through the advance respiratory training and have a stable respiration type.