Vienna-Jaye Burchell, Gemma Arblaster, David Buckley, Jonathan Wheat
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The head movement made and the stability of the head at each position were recorded and analysed.</p><p><strong>Results: </strong>Compared to the electromagnetic tracking system (Polhemus), the depth camera (Kinect) always measured a smaller head movement. Measurements with the two devices were not statistically significantly different for turn right (P = 0.3955, p > 0.05), turn left (P = 0.4749, p > 0.05), tilt right (P = 0.7086, p > 0.05) and tilt left (P = 0.4091, p > 0.05) head movements. However, the smaller depth camera measurement of chin up and chin down head movements were statistically significant, chin up (P = 0.0001, p < 0.01) and chin down (P = 0.0005, p < 0.001). At each eccentric position, the depth camera (Kinect) recordings were more variable than the electromagnetic tracking system (Polhemus).</p><p><strong>Conclusions: </strong>Compared to the electromagnetic tracking system (Polhemus), the depth camera (Kinect) was comparable for measuring head turns and tilts but was less accurate at measuring chin up and chin down head positions. Further research is needed before the depth cameras are considered for clinical recordings of head position.</p>","PeriodicalId":36083,"journal":{"name":"British and Irish Orthoptic Journal","volume":"17 1","pages":"142-149"},"PeriodicalIF":0.0000,"publicationDate":"2021-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8603860/pdf/","citationCount":"4","resultStr":"{\"title\":\"Is a Depth Camera in Agreement with an Electromagnetic Tracking Device when Measuring Head Position?\",\"authors\":\"Vienna-Jaye Burchell, Gemma Arblaster, David Buckley, Jonathan Wheat\",\"doi\":\"10.22599/bioj.227\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Introduction: </strong>Clinicians typically observe and describe abnormal head postures (AHPs) and may also measure them. 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Measurements with the two devices were not statistically significantly different for turn right (P = 0.3955, p > 0.05), turn left (P = 0.4749, p > 0.05), tilt right (P = 0.7086, p > 0.05) and tilt left (P = 0.4091, p > 0.05) head movements. However, the smaller depth camera measurement of chin up and chin down head movements were statistically significant, chin up (P = 0.0001, p < 0.01) and chin down (P = 0.0005, p < 0.001). At each eccentric position, the depth camera (Kinect) recordings were more variable than the electromagnetic tracking system (Polhemus).</p><p><strong>Conclusions: </strong>Compared to the electromagnetic tracking system (Polhemus), the depth camera (Kinect) was comparable for measuring head turns and tilts but was less accurate at measuring chin up and chin down head positions. 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引用次数: 4
摘要
临床医生通常观察和描述异常头部姿势(ahp),也可能测量它们。深度相机被认为是使用人脸跟踪技术测量头部位置的可靠测量设备。这项研究比较了深度相机(微软Kinect)和黄金标准电磁跟踪系统(Polhemus设备)来测量头部位置。方法:20名健康志愿者(平均年龄21岁)使用深度相机(Kinect)和电磁跟踪系统(Polhemus)同时记录头部位置。参与者被要求做30度头部运动,分别是上下巴、下下巴、转头和倾斜头部。记录和分析了头部在每个位置的运动和稳定性。结果:与电磁跟踪系统(Polhemus)相比,深度相机(Kinect)总是测量到更小的头部运动。两种器械对右转(P = 0.3955, P > 0.05)、左转(P = 0.4749, P > 0.05)、右倾斜(P = 0.7086, P > 0.05)和左倾斜(P = 0.4091, P > 0.05)头部运动的测量差异无统计学意义。然而,较小深度相机测量的下巴向上和下巴向下头部运动,下巴向上(P = 0.0001, P < 0.01)和下巴向下(P = 0.0005, P < 0.001)具有统计学意义。在每个偏心位置,深度相机(Kinect)的记录比电磁跟踪系统(Polhemus)的记录变化更大。结论:与电磁跟踪系统(Polhemus)相比,深度相机(Kinect)在测量头部转动和倾斜方面具有可比性,但在测量下巴向上和下巴向下的头部位置时准确性较差。在考虑将深度相机用于临床记录头部位置之前,还需要进一步的研究。
Is a Depth Camera in Agreement with an Electromagnetic Tracking Device when Measuring Head Position?
Introduction: Clinicians typically observe and describe abnormal head postures (AHPs) and may also measure them. Depth cameras have been suggested as a reliable measurement device for measuring head position using face-tracking technology. This study compared a depth camera (Microsoft Kinect) to a gold standard electromagnetic tracking system (Polhemus device) to measure head position.
Method: Twenty healthy volunteers (mean age 21 years) had their head position simultaneously recorded using the depth camera (Kinect) and the electromagnetic tracking system (Polhemus). Participants were asked to make 30-degree head movements into chin up, chin down, head turn and head tilt positions. The head movement made and the stability of the head at each position were recorded and analysed.
Results: Compared to the electromagnetic tracking system (Polhemus), the depth camera (Kinect) always measured a smaller head movement. Measurements with the two devices were not statistically significantly different for turn right (P = 0.3955, p > 0.05), turn left (P = 0.4749, p > 0.05), tilt right (P = 0.7086, p > 0.05) and tilt left (P = 0.4091, p > 0.05) head movements. However, the smaller depth camera measurement of chin up and chin down head movements were statistically significant, chin up (P = 0.0001, p < 0.01) and chin down (P = 0.0005, p < 0.001). At each eccentric position, the depth camera (Kinect) recordings were more variable than the electromagnetic tracking system (Polhemus).
Conclusions: Compared to the electromagnetic tracking system (Polhemus), the depth camera (Kinect) was comparable for measuring head turns and tilts but was less accurate at measuring chin up and chin down head positions. Further research is needed before the depth cameras are considered for clinical recordings of head position.