Implementation of the CatalystTM Optical Surface Imaging System for Left-Sided Breast Cancer Patients with Deep Inspiration Breath Hold Technique
Keywords:
deep inspiration breath hold, left-sided breast cancer, optical surface imaging, patient setupAbstract
Backgrounds: Optical surface imaging (OSI) system is currently introduced for patient’s position verification, monitoring during treatment as well as for gating radiotherapy. The use of this technology is found to be an attractive IGRT for deep inspiration breathe hold (DIBH) technique in radiotherapy of breast cancer patient. Objective: The aim of this study is to evaluate the performance and reliability of the OSI system for image guidance in DIBH for left-sided breast cancer patient. Materials and methods: A comprehensive acceptance and commissioning was performed according to the AAPM TG-147 guideline to check communication system, accuracy and reproducibility of the detection system. For OSI implementation, the overall process accuracy was examined using the end-to-end test with thorax phantom. For the patient positioning, the set up deviations from the OSI in 16 left-breast cancer patients were retrospectively compared with the routine CBCT and kV planar IGRT. Results: The investigation showed the patient data from OSI can be transferred correctly to the peripheral equipment. Accuracy verification in the static movement, mean±SD of the deviations in lateral, longitudinal, and vertical were 0.13±0.10 mm, 0.19±0.09 mm, and 0.23±0.17 mm, respectively. For pitch, roll, and rotation, the deviations were presented to be 0.01±0.07°, 0.07±0.03°, and 0.03±0.05°, respectively. For the dynamic localization, the mean deviated amplitude was 0.05±0.41mm. Whole treatment process with OSI showed excellent integration and agreement within 2 mm. Using OSI for patient positioning, the average deviation in lateral, longitudinal, and vertical axis were 2.3±1.7 mm, 2.8±3.1 mm, 2.2±1.9 mm when compared with 72 CBCT images, and were 2.4±2.2 mm, 3.5±2.6 mm, and 2.3±2.2 mm when compared with 130 kV-image pairs. Conclusion: The CatalystTM OSI system is found to be an efficient image guidance for patient setup and accurate for implementing in DIBH technique.
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