Radiation Physics

PV QA 3 - Poster Viewing Q&A 3

TU_18_3295 - A Novel System for Deep Inspiration Breath Hold (DIBH) using Virtual Reality, Head-Mounted Device, 3-D Game, Camera and Wireless Body Motion Sensor

Tuesday, October 23
1:00 PM - 2:30 PM
Location: Innovation Hub, Exhibit Hall 3

A Novel System for Deep Inspiration Breath Hold (DIBH) using Virtual Reality, Head-Mounted Device, 3-D Game, Camera and Wireless Body Motion Sensor
H. B. Giap; University of California at San Diego, San Diego, CA; California Protons Cancer Therapy Center, San Diego, CA

Purpose/Objective(s):

Current respiration management solutions are often invasive (fiducial marker implant), not patient friendly (use of spirometer), requirement of extensive and expensive treatment room modification, use of many radiographs, passive patient participation. This study proposes a novel noninvasive technique for Deep Inspiration Breath Hold (DIBH) that utilizes virtual reality (VR), interactive 3-D game coupled with wireless body motion sensors, and reflective marker with in-room camera.

Materials/Methods:

The VR system consists of: (1) Head Mounted Display showing 3-D 1080p video and audio; (2) One wireless bluetooth motion sensor with six degree of freedom and accelerometer, gyroscope, magnetometer, placed on patient's chest or abdomen; (3) 1080p camera tracking the sensor's reflective surface; (4) an 3-D interactive game; (5) a computer platform that incorporates all these components. The game will feature patient as an avatar flying a saucer through a tunnel for a certain set time needed for the breath hold needed for the radiation therapy. The position of the patient’s chest/abdomen is provided by combination of translational and rotational position signals from wireless body motion sensor and the reflective marker detected by the in-room high resolution camera. The position of the chest/abdomen is constantly monitored and coupled with the avatar in the game. The detected position is constantly compared to the reference position. The position of the avatar in the tunnel is controlled by the patient, and it is seen by both the patients and the therapist. The objective is that the patient will maintain the breath hold or chest/abdomen position within a “green zone” for the required duration. If the position is deviated, then the position of the avatar is shown in the “yellow zone” (minor deviation) or the “red zone” (large deviation). The audial and visual feedbacks are provided to patients whether patient is in the green, yellow or red zone. Patient can make adjustment of of the breathing or the chest/abdomen position back to reference position. For major deviation, an interruption signal can be sent to treatment machine directly to pause the radiation treatment.

Results:

A prototype system has been developed and currently being tested in healthy volunteers. Accuracy of the system is within 3-5 mm. The next step is to perform a pilot clinical study on actual patients.

Conclusion:

The system can offer a simple, non-invasive, patient friendly, patient controlled, and stimulating solution for management of organ motions due to respiration using DIBH.

Author Disclosure: H.B. Giap: None.

Huan Giap, MD, PhD

Disclosure:
Employment
California Proton Cancer Treatment Center: Radiation Oncologist: inventor and founder; eviCore Healthcare: Associated Medical Reviewer

Compensation
TAE Life Sciences; Varian Medical Systems

Ownership
Virtual Reality Medical Applications: inventer and founderPatent/License Fees/Copyright

Leadership
Particle Therapy Co-Operative Group: Chair of Publication SubCommittee

Biography:
Huan Giap, MD, PhD
Radiation Oncologist - California Proton Cancer Treatment Center
Volunteer Clinical Professor, University of California at San Diego
Co-Editor-in-Chief for the Translational Cancer Research Journal
Co-Editor-in-Chief for the International Journal of Medical Physics, Clinical Engineering, and Radiation Oncology.
Co-chairperson of the Publication Committee of PTCOG (Particle Beam Therapy Co-Operative Group)

Presentation(s):

Send Email for Huan Giap


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TU_18_3295 - A Novel System for Deep Inspiration Breath Hold (DIBH) using Virtual Reality, Head-Mounted Device, 3-D Game, Camera and Wireless Body Motion Sensor



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