目的:基于陀螺仪、三维手术设计软件建立自然头位(nature head position,NHP)记录及转移系统,在手术设计软件中将"数字头颅"重置于自然头位,评估该系统的可行性和精确度。方法:基于陀螺仪和三维编辑软件建立自然头位记录及转...目的:基于陀螺仪、三维手术设计软件建立自然头位(nature head position,NHP)记录及转移系统,在手术设计软件中将"数字头颅"重置于自然头位,评估该系统的可行性和精确度。方法:基于陀螺仪和三维编辑软件建立自然头位记录及转移系统。(1)通过牙合叉、面弓等装置将陀螺仪与患者头部固联。患者佩戴陀螺仪装置,通过镜像调整头颅位姿到自然头位后,用陀螺仪记录即刻头颅的俯仰角(Pitch)、横滚角(Roll)和侧偏角(Yaw),这是实际NHP。(2)当陀螺仪位姿为零位时(Pitch=0°,Roll=0°,Yaw=0°),进行锥体束CT扫描,三维重建后得到标准陀螺仪模型。(3)将患者数字头颅与标准陀螺仪模型配准融合,两物体共同旋转至记录的NHP位姿(Pitch、Roll,Yaw),数字头颅在虚拟环境下重置于NHP,是为虚拟NHP。(4)采用标准立方体作为试件,将其摆放于任意位姿,分别记录其实际位姿和虚拟位姿,进行30次实验,计算实际位姿与虚拟位姿的差异(ΔPitch,ΔRoll,ΔYaw),如符合正态分布,对实际位姿与虚拟位姿的3个角度分别进行配对t检验,对它们的相关性进行Pearson检验。结果:陀螺仪装置能够记录患者头颅位姿,并可通过软件将该位姿转移至手术设计系统。ΔPitch=0.03°±0.28°,ΔRoll=0.03°±0.23°,ΔYaw=0.07°±0.49°,立方体实际位姿与转换后虚拟位姿相应角度差异均无统计学意义(P>0.05);Pearson检验得到两者在α=0.01水平(双向)显著相关(r=1.00)。结论:基于陀螺仪装置和三维手术设计软件的自然头位记录、转移系统精度满足正颌外科手术设计需求,操作流程具备可行性。展开更多
AIMTo assess the repeatability of measuring optic nerve head (ONH) parameters using the Cirrus optical coherence tomography (OCT), as well as to assess the effect of head tilt on these measurements.METHODSThirty healt...AIMTo assess the repeatability of measuring optic nerve head (ONH) parameters using the Cirrus optical coherence tomography (OCT), as well as to assess the effect of head tilt on these measurements.METHODSThirty healthy participants with no evidence of glaucoma were recruited for the study. Visual acuity, intraocular pressure, standard automated perimetry and ocular examination were performed for each participant. One eye was then randomly selected and scanned undilated with the Cirrus OCT in 3 positions (neutral, 30° right tilt and 30° left tilt).RESULTSData collected from 29 eyes were used for analysis. One patient was omitted due to poor scan quality. The repeatability of the ONH parameters was analyzed using analysis of variance, coefficient of variation (COV) and intraclass correlation coefficient (ICC). Analysis of variance showed no statistically significant difference between 3 scans in a single position. There was good agreement between measurements (ICC 0.919-0.996, COV 1.94%-5.48%). Even with the presence of head tilt, repeated scans in the 3 positions showed good agreement as well (ICC 0.888-0.996, COV 2.04%-5.39%).CONCLUSIONSerial measurements of ONH parameters using the Cirrus OCT are found to have good repeatability. The ONH parameters with Cirrus OCT also maintain good repeatability despite head tilt.展开更多
文摘目的:基于陀螺仪、三维手术设计软件建立自然头位(nature head position,NHP)记录及转移系统,在手术设计软件中将"数字头颅"重置于自然头位,评估该系统的可行性和精确度。方法:基于陀螺仪和三维编辑软件建立自然头位记录及转移系统。(1)通过牙合叉、面弓等装置将陀螺仪与患者头部固联。患者佩戴陀螺仪装置,通过镜像调整头颅位姿到自然头位后,用陀螺仪记录即刻头颅的俯仰角(Pitch)、横滚角(Roll)和侧偏角(Yaw),这是实际NHP。(2)当陀螺仪位姿为零位时(Pitch=0°,Roll=0°,Yaw=0°),进行锥体束CT扫描,三维重建后得到标准陀螺仪模型。(3)将患者数字头颅与标准陀螺仪模型配准融合,两物体共同旋转至记录的NHP位姿(Pitch、Roll,Yaw),数字头颅在虚拟环境下重置于NHP,是为虚拟NHP。(4)采用标准立方体作为试件,将其摆放于任意位姿,分别记录其实际位姿和虚拟位姿,进行30次实验,计算实际位姿与虚拟位姿的差异(ΔPitch,ΔRoll,ΔYaw),如符合正态分布,对实际位姿与虚拟位姿的3个角度分别进行配对t检验,对它们的相关性进行Pearson检验。结果:陀螺仪装置能够记录患者头颅位姿,并可通过软件将该位姿转移至手术设计系统。ΔPitch=0.03°±0.28°,ΔRoll=0.03°±0.23°,ΔYaw=0.07°±0.49°,立方体实际位姿与转换后虚拟位姿相应角度差异均无统计学意义(P>0.05);Pearson检验得到两者在α=0.01水平(双向)显著相关(r=1.00)。结论:基于陀螺仪装置和三维手术设计软件的自然头位记录、转移系统精度满足正颌外科手术设计需求,操作流程具备可行性。
文摘AIMTo assess the repeatability of measuring optic nerve head (ONH) parameters using the Cirrus optical coherence tomography (OCT), as well as to assess the effect of head tilt on these measurements.METHODSThirty healthy participants with no evidence of glaucoma were recruited for the study. Visual acuity, intraocular pressure, standard automated perimetry and ocular examination were performed for each participant. One eye was then randomly selected and scanned undilated with the Cirrus OCT in 3 positions (neutral, 30° right tilt and 30° left tilt).RESULTSData collected from 29 eyes were used for analysis. One patient was omitted due to poor scan quality. The repeatability of the ONH parameters was analyzed using analysis of variance, coefficient of variation (COV) and intraclass correlation coefficient (ICC). Analysis of variance showed no statistically significant difference between 3 scans in a single position. There was good agreement between measurements (ICC 0.919-0.996, COV 1.94%-5.48%). Even with the presence of head tilt, repeated scans in the 3 positions showed good agreement as well (ICC 0.888-0.996, COV 2.04%-5.39%).CONCLUSIONSerial measurements of ONH parameters using the Cirrus OCT are found to have good repeatability. The ONH parameters with Cirrus OCT also maintain good repeatability despite head tilt.