Development of a body movement detection system to avoid re-exposure during radiography.

IF 1.7 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Radiological Physics and Technology Pub Date : 2024-09-01 Epub Date: 2024-06-14 DOI:10.1007/s12194-024-00820-y
Michihiro Eto, Tomofumi Nakawatari, Yuji Hatanaka
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Abstract

During the radiographic examination of the chest and bones in hospitals, communicating and maintaining posture is difficult for some patients, and movement before or during X-ray irradiation may necessitate re-exposure owing to body wobbling movements or breathing movements. To prevent the need for re-exposure during radiography and to determine the exposure timing, a body movement detection system that considers breathing movements was developed in this study. The posture of a patient was monitored using an RGB camera. The acquired video data was analyzed to detect body movement using either an inter-frame difference method or an optical flow estimation method. The performance of the system was evaluated by detecting the body and breathing movements during positioning. Consequently, the inter-frame difference method detected 179.8-1222.2 pixels during body movements, and the optical flow estimation method confirmed that the feature points moved by 5.5-26.6 mm (4.2-20.3 pixels). When detecting breathing movements, 82-585 pixels were detected by the inter-frame difference method, and the optical flow estimation method showed that the feature points moved by 5.2 mm (2-4 pixels). Therefore, the proposed method can detect body movements during radiography to prevent re-exposure due to body wobble and breathing movements. For healthcare providers, it will lead to reduce not only concerns about patient exposure but also unnecessary radiographic workload.

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开发人体移动检测系统,避免射线照相过程中再次曝光。
在医院对胸部和骨骼进行射线检查时,有些病人很难与人交流和保持姿势,在 X 射线照射前或照射过程中,可能会因身体摇摆或呼吸运动而需要重新照射。为了防止在射线照射过程中需要重新照射,并确定照射时间,本研究开发了一种考虑到呼吸运动的身体运动检测系统。使用 RGB 摄像机对患者的姿势进行监测。通过分析获取的视频数据,使用帧间差值法或光流估计法检测身体移动。通过检测定位过程中的身体和呼吸运动,对系统的性能进行了评估。结果,帧间差分法检测到身体移动时的 179.8-1222.2 像素,光流估计法确认特征点移动了 5.5-26.6 毫米(4.2-20.3 像素)。在检测呼吸运动时,采用帧间差值法检测到 82-585 个像素,光流估计法显示特征点移动了 5.2 毫米(2-4 个像素)。因此,所提出的方法可以检测到射线照相过程中的身体移动,防止因身体晃动和呼吸运动而造成的再次曝光。对于医疗服务提供者来说,这不仅能减少对病人曝光的担忧,还能减少不必要的放射工作量。
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来源期刊
Radiological Physics and Technology
Radiological Physics and Technology RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
3.00
自引率
12.50%
发文量
40
期刊介绍: The purpose of the journal Radiological Physics and Technology is to provide a forum for sharing new knowledge related to research and development in radiological science and technology, including medical physics and radiological technology in diagnostic radiology, nuclear medicine, and radiation therapy among many other radiological disciplines, as well as to contribute to progress and improvement in medical practice and patient health care.
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