Author: Shen Fu, Jun Hou, Zuofeng LI, Taize Yuan, Qingyuan Zhang, Yuanshui Zheng π¨βπ¬
Affiliation: GuangZhou Concord Cancer Center, Guangzhou Concord Cancer Center, εΉΏε·ζ³°εθΏη€ε»ι’ π
Purpose: A visual feedback system is beneficial for patients to maintain consistent respiratory signal during gated radiotherapy, especially for intensity modulated proton therapy (IMPT) where motion interplay remains an issue. However, there is currently no commercial such system available for a proton unit like ours. The goal of the study is to develop an in-house video feedback system assembled from low cost commercially available components and share our experience on its application.
Methods: The ProBeam proton system was used in our center. The visual feedback system consisted of the respiratory computer from proton unit vendor, a DVI to Type-C converter cable, an Honor X9 smart phone (any smart phone with Type-C interface would work too), goggles (VR Shinecon). A USB camera app was installed on the smart phone, which was connected to the vendor respiratory gating computer via the DVI to Type-C converter. The respiratory signal was zoomed and panned for best view on the smartphone in the control room, then was screencast to the goggles/glasses worn by the patient in the treatment room, using the screencast funtion from the phone vendor and a small screen cast device connected to the goggles.
Results: The video feedback system has been implemented for clinical use. The performance of the device was found to be satisfactory. The patients were coached for respiratory gated IMPT and the usage of the goggles, which includes wearing the goggles, how to breathe regularly and monitor respiratory wave cycle and the threshold levels for beam gating. The therapists have reported that patientsβ respiratory signal was more consistent during respiratory gating with the use of the visual feedback system. It will be further used for breath holding IMPT.
Conclusion: An in house video feedback system for motion management was successfully implemented for patients with respiratory gated IMPT.