Ogawa Kenichi
Kyoto University Hospital, Clinical Radiology Service, Kyoto, Japan.
Nihon Hoshasen Gijutsu Gakkai Zasshi. 2009 Jan 20;65(1):50-6. doi: 10.6009/jjrt.65.50.
With attention given to the fact that information on weight and height is available in advance from electronic medical charts, we devised a method for determining body thickness on the basis of a simple calculation. The formula is as follows: body thickness=weight(a) x height(b) xf. In order to obtain body thickness from the above formula, it is necessary to determine optimal factors of a, b, and f. Therefore, the formula is modified to give f=body thickness/weight(a) x height(b). Then, a multiplier of a with b is changed to determine a combination in which f is varied to the smallest extent. Every site of the body is checked to find that an optimal multiplier of a with b is weight(0.6) x height(-0.8). This multiplier is applicable to all sites of the body. Then, f is given as a median of 15 to 74 cases in which calculation is made for each case based on the formula of weight(0.6) x height(-0.8) and the body thickness. A difference between calculation values and measured values is equivalent to the variation of f in which the median is given as 100%. The variation of f at all sites of the body is 3% to 11% in terms of average absolute deviation. The calculation difference is obtained by the formula of body thickness x average absolute deviation. Where the calculation difference is within the above range, clinical practices will be influenced to a small extent. Thus, this study will provide an effective method for determining body thickness.
鉴于电子病历中可提前获取体重和身高信息，我们设计了一种基于简单计算来确定身体厚度的方法。公式如下：身体厚度 = 体重(a)×身高(b)×f。为了从上述公式中得出身体厚度，有必要确定a、b和f的最佳因子。因此，公式修改为f = 身体厚度 / 体重(a)×身高(b)。然后，改变a与b的乘数，以确定f变化最小的组合。检查身体的每个部位，发现a与b的最佳乘数是体重(0.6)×身高(-0.8)。这个乘数适用于身体的所有部位。然后，f是根据体重(0.6)×身高(-0.8)和身体厚度的公式对每种情况进行计算的15至74个案例的中位数。计算值与测量值之间的差异等同于f的变化，其中位数设为100%。就平均绝对偏差而言，身体所有部位f的变化为3%至11%。计算差异通过身体厚度×平均绝对偏差的公式得出。当计算差异在上述范围内时，对临床实践的影响较小。因此，本研究将提供一种确定身体厚度的有效方法。
