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首页> 外文期刊>Journal of applied clinical medical physics / >Moving stereotactic fiducial system to obtain a respiratory signal: proof of principle
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Moving stereotactic fiducial system to obtain a respiratory signal: proof of principle

机译：移动立体定向基准系统以获取呼吸信号：原理证明

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The purpose of this study was to obtain a respiratory signal with the use of an add-on device to a specific stereotactic body frame and evaluate precision and accuracy of the method, with the use of a dynamic phantom. The authors designed and constructed a simple add-on device which, attached to a stereotactic body frame, provides information of the patient's respiratory signal in every CT axial image acquired. To assess the approach, 12 CT studies were acquired, on a phantom that simulates respiratory motion, which was placed inside the frame with the add-on device. Images of the phantom with sinusoidal and shark-fin motion patterns were acquired, with different amplitude in the movement of the external surrogate and the target. Cycle time was 6 s. Images were retrospectively processed to obtain a respiratory signal from the vertical movement of the “abdomen.” The obtained signal was adjusted to a sinusoidal function; the resultant amplitude and cycle time were compared with the preset function in the phantom. The cycle amplitude and time obtained with the method agreed with the preset values within 0.4 mm and 0.29 s, respectively. In the cases of sinusoidal movements the maximal discrepancy was less than 1 mm. A respiratory signal was obtained in all cine CT sequence studies with this method that consistently coincides with the preset motion of the phantom. The authors proposed a tool to obtain a respiratory signal based on information contained into the CT axial images.PACS number: 87.57qp
机译：这项研究的目的是通过在特定的立体定向车身框架上使用附加设备来获得呼吸信号，并使用动态体模评估该方法的精度和准确性。作者设计并构建了一个简单的附加设备，该设备连接到立体定向车体框架上，可在获取的每个CT轴向图像中提供患者呼吸信号的信息。为了评估该方法，在模拟呼吸运动的幻像上获得了12项CT研究，该幻像通过附加设备放置在框架内。获取具有正弦曲线和鱼翅运动模式的体模图像，外部代理和目标的运动幅度不同。循环时间为6 s。回顾性处理图像，以从“腹部”的垂直运动中获得呼吸信号。将获得的信号调整为正弦函数;将所得的幅度和周期时间与模型中的预设功能进行比较。通过该方法获得的循环振幅和时间分别与0.4 mm和0.29 s之内的预设值相符。在正弦运动的情况下，最大差异小于1毫米。在所有电影CT序列研究中，都使用此方法获得了呼吸信号，该信号始终与体模的预设运动一致。作者提出了一种基于CT轴向图像中包含的信息来获取呼吸信号的工具.PACS编号：87.57qp

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