Chest wall and lung volume estimation by optical reflectance motion analysis
Chest wall and lung volume estimation by optical reflectance motion analysis
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DOI：
10.1152/jappl.1996.81.6.2680
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发表时间：
1996-12-01
影响因子：
3.3
通讯作者：
Rochester, DF
中科院分区：
文献类型：
--
作者：
Cala, SJ;Kenyon, CM;Rochester, DF
通过表面测量来估计胸壁运动只允许对胸壁进行一维测量。我们已经评估了一种光学反射系统（OR），它可以跟踪用于呼吸的三维（3-D）反射标记。我们在两名正常站立的受试者胸骨切迹和髂前上嵴之间沿胸壁圆周排列了7排86个（直径6毫米）半球形反射标记。我们计算了整个胸壁的容积，并将吸气和呼气容积与肺活量测定法得到的容积进行了比较。标记位置由四个电视摄像机记录；两个在被试者前面4米，两个在被试者后面4米。将电视信号以100 Hz的频率采样，并结合个人计算机上的网格校准参数，得到标记物的三维坐标。通过点数据进行三角剖分重构胸壁表面，计算胸壁体积。在潮汐呼吸和肺活量操作期间以及co2刺激的呼吸急促期间，肺活量计估算的肺容量（VL） [VL(SP)]与OR [VL(OR)]具有非常密切的相关性。两组受试者的VL(OR) (y)与VL(SP) （x， BTPS单位升）的回归方程分别为y = 1.01x - 0.01 （r = 0.996）和y = 0.96x + 0.03 (r = 0.997), y = 1.04x + 0.25 （r = 0.97）和y = 0.98x + 0.14 （r = 0.95）。我们得出结论，肺活量可以非常准确和直接地从胸壁表面标记物估计，我们推测OR可以有效地应用于胸壁形状、区域容积和运动分析的计算。
Estimation of chestwall motion by surface measurements only allows one-dimensional measurements of the chest wall. We have assessed an optical reflectance system (OR), which tracks reflective markers in three dimensions (3-D) for respiratory use. We used 86 (6-mm-diameter) hemispherical reflective markers arranged circumferentially on the chest wall in seven rows between the sternal notch and the anterior superior iliac crest in two normal standing subjects. We calculated the volume of the entire chest wall and compared inspired and expired volumes with volumes obtained by spirometry. Marker positions were recorded by four TV cameras; two were 4 m in front of and two were 4 m behind the subject. The TV signals were sampled at 100 Hz and combined with grid calibration parameters on a personal computer to obtain the 3-D coordinates of the markers. Chest wall surfaces were reconstructed by triangulation through the point data, and chest wall volume was calculated. During tidal breathing and vital capacity maneuvers and during CO2-stimulated hyperpnea, there was a very close correlation of the lung volumes (VL) estimated by spirometry [VL(SP)] and OR [VL(OR)]. Regression equations of VL(OR) (y) vs. VL(SP) (x, BTPS in liters) for the two subjects were given by y = 1.01x - 0.01 (r = 0.996) and y = 0.96x + 0.03 (r = 0.997), and by y = 1.04x + 0.25 (r = 0.97) and y = 0.98x + 0.14 (r = 0.95) for the two maneuvers, respectively. We conclude spirometric volumes can be estimated very accurately and directly from chest wall surface markers, and we speculate that OR may be usefully applied to calculations of chest wall shape, regional volumes, and motion analysis.