Spatial resolution in plantar pressure measurement revisited
Spatial resolution in plantar pressure measurement revisited
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DOI：
10.1016/j.jbiomech.2012.05.038
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发表时间：
2012-08-09
影响因子：
2.4
通讯作者：
Pataky, Todd C.
中科院分区：
文献类型：
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作者：
Pataky, Todd C.
足底压力通常使用有限面积的传感器来测量，因此可以测量真实最大压力的精度取决于传感器尺寸。先前已对一名患者的跖骨进行了测量准确性建模（Lord，1997），但尚未对一般受试者或足部其他部位进行建模。本研究的目的是（i）确定Lord（1997）模型是否也适用于足跟和拇趾压力，以及（ii）在许多测量设置的四个常见因素（压力脉冲大小、足部定位、压力变化量化和总压力重新分布）的背景下，检查传感器大小与测量精度的关系。Lord（1997）的模型首先被推广，然后使用10名健康的步行受试者进行验证，RMSE值相对较低，约为20 kPa。接下来，使用姿势数据来显示总压力再分布可以准确量化（p < 0.002）。最后，数值分析表明，传感器尺寸和测量精度之间的关系是非常复杂的，与深度依赖于测量上下文。特别是，在目前研究的场景中，实现90%精度所需的关键传感器宽度范围为1.7 mm至17.4 mm。由于测量精度随许多因素变化很大，因此目前的结果无法得出有关空间分辨率的具体建议。简单地得出结论，没有特定的空间分辨率可以在常见的足底压力测量任务中产生恒定的测量精度。(C)2012爱思唯尔有限公司保留所有权利。
Plantar pressures are typically measured using sensors of finite area, so the accuracy with which one can measure true maximum pressure is dependent on sensor size. Measurement accuracy has been modeled previously for one patient's metatarsals (Lord, 1997), but has not been modeled either for general subjects or for other parts of the foot. The purposes of this study were (i) to determine whether Lord's (1997) model is also valid for heel and hallux pressures, and (ii) to examine how sensor size relates to measurement accuracy in the context of four factors common to many measurement settings: pressure pulse size, foot positioning, pressure change quantification, and gross pressure redistribution. Lord's (1997) model was first generalized and was then validated using 10 healthy walking subjects, with relatively low RMSE values on the order of 20 kPa. Next, postural data were used to show that gross pressure redistributions can be accurately quantified (p < 0.002). even with rather gross sensor sizes of 30 mm. Finally, numerical analyses revealed that the relation between sensor size and measurement accuracy is highly complex, with deep dependency on the measurement context. In particular, the critical sensor widths required to achieve 90% accuracy ranged from 1.7 mm to 17.4 mm amongst the presently investigated scenarios. Since measurement accuracy varies so extensively with so many factors, the current results cannot yield specific recommendations regarding spatial resolution. It is concluded simply that no particular spatial resolution can yield a constant measurement accuracy across common plantar pressure measurement tasks. (C) 2012 Elsevier Ltd. All rights reserved.