Kyung Hwan Chang1, Suk Lee2, Hong Jung3, Yeon-Wook Choo3, Yuan Jie Cao1, Jang Bo Shim1, Kwang Hyeon Kim4, Nam Kwon Lee1, Young Je Park1, Chul Yong Kim1, Sam Ju Cho5, Sang Hoon Lee6, Chul Kee Min7, Woo Chul Kim7, Kwang Hwan Cho7, Hyun Do Huh8, Sangwook Lim9. 1. Department of Radiation Oncology, College of Medicine, Korea University, Seoul, Republic of Korea. 2. Department of Radiation Oncology, College of Medicine, Korea University, Seoul, Republic of Korea. Electronic address: sukmp@korea.ac.kr. 3. WILLMED Medical System, Seoul, Republic of Korea. 4. Department of Radiation Oncology, College of Medicine, Korea University, Seoul, Republic of Korea; Department of Bio-medical Science, College of Science & Technology, Korea University, Seoul, Republic of Korea. 5. Department of Radiation Oncology, College of Medicine, Yonsei Cancer Center, Yonsei University, Seoul, Republic of Korea. 6. Department of Radiation Oncology, Cheil General Hospital & Women's Healthcare Center, Seoul, Republic of Korea; Dankook University College of Medicine, Cheonan, Republic of Korea. 7. Department of Radiation Oncology, Soonchunhyang University Hospital, Bucheon, Republic of Korea. 8. Department of Radiation Oncology, Inha University Hospital, Incheon, Republic of Korea. 9. Department of Radiation Oncology, College of Medicine, Kosin University, Busan, Republic of Korea.
Abstract
PURPOSE: This paper describes the hardware and software characteristics of a 3D optical scanner (P3DS) developed in-house. The P3DS consists of an LED light source, diffuse screen, step motor, CCD camera, and scanner management software with 3D reconstructed software. MATERIALS AND METHOD: We performed optical simulation, 2D and 3D reconstruction image testing, and pre-clinical testing for the P3DS. We developed the optical scanner with three key characteristics in mind. First, we developed a continuous scanning method to expand possible clinical applications. Second, we manufactured a collimator to improve image quality by reducing scattering from the light source. Third, we developed an optical scanner with changeable camera positioning to enable acquisition of optimal images according to the size of the gel dosimeter. RESULTS: We confirmed ray-tracing in P3DS with optic simulation and found that 2D projection and 3D reconstructed images were qualitatively similar to the phantom images. For pre-clinical tests, the dose distribution and profile showed good agreement among RTP, optical CT, and external beam radiotherapy film data for the axial and coronal views. The P3DS has shown that it can scan and reconstruct for evaluation of the gel dosimeter within 1 min. We confirmed that the P3DS system is a useful tool for the measurement of 3D dose distributions for 3D radiation therapy QA. Further experiments are needed to investigate quantitative analysis for 3D dose distribution.
PURPOSE: This paper describes the hardware and software characteristics of a 3D optical scanner (P3DS) developed in-house. The P3DS consists of an LED light source, diffuse screen, step motor, CCD camera, and scanner management software with 3D reconstructed software. MATERIALS AND METHOD: We performed optical simulation, 2D and 3D reconstruction image testing, and pre-clinical testing for the P3DS. We developed the optical scanner with three key characteristics in mind. First, we developed a continuous scanning method to expand possible clinical applications. Second, we manufactured a collimator to improve image quality by reducing scattering from the light source. Third, we developed an optical scanner with changeable camera positioning to enable acquisition of optimal images according to the size of the gel dosimeter. RESULTS: We confirmed ray-tracing in P3DS with optic simulation and found that 2D projection and 3D reconstructed images were qualitatively similar to the phantom images. For pre-clinical tests, the dose distribution and profile showed good agreement among RTP, optical CT, and external beam radiotherapy film data for the axial and coronal views. The P3DS has shown that it can scan and reconstruct for evaluation of the gel dosimeter within 1 min. We confirmed that the P3DS system is a useful tool for the measurement of 3D dose distributions for 3D radiation therapy QA. Further experiments are needed to investigate quantitative analysis for 3D dose distribution.