Detection of patient movement during CBCT examination using video observation compared with an accelerometer-gyroscope tracking system

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OBJECTIVE: Compare video observation (VO) with a novel three-dimensional registration method, based on an accelerometer-gyroscope (AG) system, to detect patient movement during CBCT examination. The movements were further analyzed according to complexity and patient's age.

METHODS: 181 patients (118 female/63 male; age average 30 years, range: 9-84), in whom 206 CBCT examinations were performed, were video-recorded during examination. An AG was at the same time attached to the patient's head to track head position in three dimensions. Three observers scored patient movement (yes/no) by VO. AG provided movement data on the x-, y-, and z-axis. Thresholds for AG-based registration were defined at 0.5, 1, 2, 3, and 4 mm (movement distance). Movement detected by VO was compared with that registered by AG, according to movement complexity (uniplanar vs. multiplanar, as defined by AG), and patient's age (≤15, 16-30, ≥31 years old).

RESULTS: According to AG, movement ≥0.5 mm was present in 160 (77.7%) examinations. According to VO, movement was present in 46 (22.3%) examinations. One VO-detected movement was not registered by AG. Overall, VO did not detect 71.9% of the movements registered by AG at the 0.5 mm threshold. At a movement distance ≥4 mm, 20% of the AG-registered movements were not detected by VO. Multiplanar movements such as lateral head rotation (72.1%) and nodding/swallowing (52.6%) were more often detected by VO in comparison to uniplanar movements, such as head lifting (33.6%) and antero-posterior translation (35.6%), at the 0.5 mm threshold. The prevalence of moving patients was highest in patients younger than 16 years (64.3% for VO and 92.3% for AG-based registration at the 0.5 mm threshold).

CONCLUSIONS: AG-based movement registration resulted in a higher prevalence of patient movement during CBCT examination than VO. AG-registered multiplanar movements were more frequently detected also by VO than uniplanar movements. The prevalence of moving patients was highest in patients younger than 16 years.

TidsskriftDentomaxillofacial Radiology
Sider (fra-til)20160289
StatusUdgivet - 27 jan. 2017

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