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Low-cost Kinect Version 2 imaging system for breath hold monitoring and gating: Proof of concept study for breast cancer VMAT radiotherapy

Edmunds, David M., Gothard, Lone, Khabra, Komel, Kirby, Anna, Madhale, Poonam, McNair, Helen, Roberts, David, Tang, KK, Symonds-Tayler, Richard, Tahavori, Fatemeh , Wells, Kevin and Donovan, Ellen (2018) Low-cost Kinect Version 2 imaging system for breath hold monitoring and gating: Proof of concept study for breast cancer VMAT radiotherapy Journal of Applied Clinical Medical Physics, 19 (3). pp. 71-78.

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Voluntary inspiration breath hold (VIBH) for left breast cancer patients has been shown to be a safe and effective method of reducing radiation dose to the heart. Currently, VIBH protocol compliance is monitored visually. In this work, we establish whether it is possible to gate the delivery of radiation from an Elekta linac using the Microsoft Kinect version 2 (Kinect v2) depth sensor to measure a patient breathing signal. This would allow contactless monitoring during VMAT treatment, as an alternative to equipment–assisted methods such as active breathing control (ABC). Breathing traces were acquired from six left breast radiotherapy patients during VIBH. We developed a gating interface to an Elekta linac, using the depth signal from a Kinect v2 to control radiation delivery to a programmable motion platform following patient breathing patterns. Radiation dose to a moving phantom with gating was verified using point dose measurements and a Delta4 verification phantom. 60 breathing traces were obtained with an acquisition success rate of 100%. Point dose measurements for gated deliveries to a moving phantom agreed to within 0.5% of ungated delivery to a static phantom using both a conventional and VMAT treatment plan. Dose measurements with the verification phantom showed that there was a median dose difference of better than 0.5% and a mean (3% 3 mm) gamma index of 92.6% for gated deliveries when using static phantom data as a reference. It is possible to use a Kinect v2 device to monitor voluntary breath hold protocol compliance in a cohort of left breast radiotherapy patients. Furthermore, it is possible to use the signal from a Kinect v2 to gate an Elekta linac to deliver radiation only during the peak inhale VIBH phase.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Edmunds, David M.
Gothard, Lone
Khabra, Komel
Kirby, Anna
Madhale, Poonam
McNair, Helen
Roberts, David
Tang, KK
Symonds-Tayler, Richard
Tahavori, Fatemeh
Donovan, Ellen
Date : 13 March 2018
DOI : 10.1002/acm2.12286
Copyright Disclaimer : © 2018 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Uncontrolled Keywords : Radiotherapy; Motion monitoring; Sensors; Respiratory gating
Depositing User : Clive Harris
Date Deposited : 17 Sep 2018 15:19
Last Modified : 17 Sep 2018 15:22

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