Audio-visual biofeedback for respiratory-gated radiotherapy: Impact of audio instruction and audio-visual biofeedback on respiratory-gated radiotherapy
Audio-visual biofeedback for respiratory-gated radiotherapy: Impact of audio instruction and audio-visual biofeedback on respiratory-gated radiotherapy
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DOI：
10.1016/j.ijrobp.2006.02.035
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发表时间：
2006-07-01
影响因子：
7
通讯作者：
Keall, Paul J.
中科院分区：
文献类型：
--
作者：
George, Rohini;Chung, Theodore D.;Keall, Paul J.
目的：呼吸门控是一种市售技术，用于减少成像和治疗期间运动的有害影响。门控的有效性取决于成像和治疗期间呼吸周期内和呼吸周期之间的再现性。本研究的目的是确定视听生物反馈是否可以提高呼吸再现性，减少残留运动，从而提高门控radiotherapy.Methods和Materials的准确性：共收集了331个呼吸道24例肺癌患者。该方案包括间隔约一周的五次呼吸训练。在每个疗程中，患者最初在没有任何指导（自由呼吸）的情况下呼吸，有音频指导和视听生物反馈。剩余运动量化的呼吸信号的标准偏差内的门控window.Results：视听生物反馈显着减少了剩余运动相比，自由呼吸和音频指令。基于位移的门控比基于相位的门控具有更低的残余运动。剩余运动减少很少被发现占空比小于30%，占空比超过50%，有一个急剧增加的剩余motion.Conclusions：门控的效率和再现性可以提高：将视听生物反馈，使用30-50%的占空比，门控在呼气，并使用基于位移的门控。(c)2006年爱思唯尔公司
Purpose: Respiratory gating is a commercially available technology for reducing the deleterious effects of motion during imaging and treatment. The efficacy of gating is dependent on the reproducibility within and between respiratory cycles during imaging and treatment. The aim of this study was to determine whether audio-visual biofeedback can improve respiratory reproducibility by decreasing residual motion and therefore increasing the accuracy of gated radiotherapy.Methods and Materials: A total of 331 respiratory traces were collected from 24 lung cancer patients. The protocol consisted of five breathing training sessions spaced about a week apart. Within each session the patients initially breathed without any instruction (free breathing), with audio instructions and with audio-visual biofeedback. Residual motion was quantified by the standard deviation of the respiratory signal within the gating window.Results: Audio-visual biofeedback significantly reduced residual motion compared with free breathing and audio instruction. Displacement-based gating has lower residual motion than phase-based gating. Little reduction in residual motion was found for duty cycles less than 30%; for duty cycles above 50% there was a sharp increase in residual motion.Conclusions: The efficiency and reproducibility of gating can be improved by: incorporating audio-visual biofeedback, using a 30-50% duty cycle, gating during exhalation, and using displacement-based gating. (c) 2006 Elsevier Inc.