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Implementation of a Cost Effective Visual Feedback System for Respiratory Gating Treatment

C Liu*, K Xie , D Shvydka , N Sperling , D Pearson , E Parsai , University of Toledo Medical Center, Toledo, OH


(Monday, 7/30/2018) 1:15 PM - 1:45 PM

Room: Exhibit Hall | Forum 4

Purpose: Respiratory motion management is important in many radiation therapy cases, while letting patients know how to cooperate properly is chalenging. In this study, we present a cost effective in-house motion management visual feedback system as a resolution to patient’s respiratory irregularity. The goal of the project is to minimize the money and labor investment in simulation and treatment of DIBH patients, without any modifications to LINAC configuration.

Methods: The system consists of three main components: (1) a standard-definition camera placed in front of the respiratory motion monitor to collect patient’s real-time breathing data; (2) A signal RF transmitter that receives the signal from camera and transmits the signal to the goggles and (3) a set of wireless video goggles that receive the video signal displaying the waveform to the patient.

Results: A prototype of the system has been developed and implemented at our facility. We have used this system on several patients and significant improvements on the gating treatment efficiency were observed. On breath-hold gating treatments, the patient was able to hold their breathing level within a tighter gating window by observing the waveform and the set thresholds though the goggle’s screen.

Conclusion: The visual feedback respiratory coaching system has been successfully tested for clinical use at our institution. The system has reduced the gating treatment time setup and improved the treatment accuracy for amplitude based gating treatments by allowing for a significantly tighter threshold window to be used. We reviewed 10 patients prior to and after implementation of this system and determined a reduction in treatment setup by nearly 30% discussed further in support document. This visual feedback system could be easily implemented at other institutions where amplitude based gating is performed and no visual feedback to the patient is available.

Funding Support, Disclosures, and Conflict of Interest: This work has been done at the University of Toledo during my master research time. I am now working at Erlanger Health System as a first year resident.


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