Development of a room laser based real-time alignment monitoring system using an array of photodiodes |
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| Institution: | 1. Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Medicine, Catholic University of Korea, Seoul 505, Republic of Korea;2. Department of Radiation Oncology, University of Florida, Gainesville, FL 32610-0385, United States;3. Molecular Imaging Program at Stanford (MIPS), Department of Radiology, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, United States;4. Department of Radiation Oncology, College of Medicine, Seoul St. Mary''s Hospital, Catholic University of Korea, Seoul 505, Republic of Korea;1. Department of Radiation Oncology, Icahn School of Medicine at Mount Sinai, New York, New York;2. Department of Otolaryngology, Icahn School of Medicine at Mount Sinai, New York, New York;3. Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center, New York, New York;1. Radiation Oncology Program, Division of Hematology Oncology, Children’s Hospital Los Angeles, Los Angeles, California;2. Department of Radiation Oncology, University of Southern California, Los Angeles, California;3. Massachusetts Institute of Technology, Cambridge, Massachusetts |
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| Abstract: | PurposeTo develop a real-time alignment monitoring system (RAMS) to compensate for the limitations of the conventional room-laser-based alignment system. To verify the feasibility of the RAMS, reproducibility and accuracy tests were conducted.MethodsRAMS was composed of a room laser sensing array (RLSA), an electric circuit, an analog-to-digital converter (ADC), and a control PC. The RLSA was designed to arrange photodiodes in a pattern that results in the RAMS having a resolution of 1 mm. The photodiodes were used for quantitative assessment of the alignment condition. To verify the usability of the developed system, we conducted tests of temporal reproducibility, repeatability, and accuracy.ResultsThe results of the temporal reproducibility test suggested that the signal of the RAMS was stable with respect to time. Further, the repeatability test resulted in a maximum coefficient of variance of 1.14%, suggesting that the signal of the RAMS was stable over repeated set-ups. The accuracy test confirmed that the “on” and “off” signals could be distinguished by signal intensity, considering that the “off” signal was below 75% of the “on” signal in every case. In addition, we confirmed that the system can detect 1 mm of movement by monitoring the pattern of the “on” and “off” signals.ConclusionWe developed a room laser based alignment monitoring system. The feasibility test verified that the system is capable of quantitative alignment monitoring in real time. We expect that the RAMS can propose the potential of the room laser based alignment monitoring method. |
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| Keywords: | Patient alignment Real-time monitoring Room laser system Radiotherapy |
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