A new method for the comparison of bone loss measurements on non-standardized radiographs.
A new method for the comparison of bone loss measurements on non-standardized radiographs.
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一种比较非标准化射线照片上骨丢失测量值的新方法。
DOI：
10.1111/j.1600-0765.1984.tb01017.x
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发表时间：
1984
影响因子：
3.5
通讯作者：
Ray C. Williams
中科院分区：
文献类型：
--
作者：
M. Jeffcoat;R. L. J. and;Ray C. Williams
推导出一种数学算法，该算法允许比较连续非标准化X线片的骨丢失测量值。在参考和替代X线片上定义了相同的三个解剖标志。这些坐标用于计算变换矩阵，该变换矩阵在数学上“弯曲”替代射线照片以适合44对非标准化射线照片中的参考射线照片。参考片和替代片中骨丢失的直接测量值的比较显示平均误差为0.55 mm。当参考片中的直接测量值与替代片上的转换测量值进行比较时，该误差显著降低至0.15 mm。这些数据表明，转换方法可能是比较非标准化的X线片的价值。
A mathematical algorithm was derived which allows comparison of measurements of bone loss from sequential non-standardized radiographs. The same three anatomical landmarks were defined on both a reference and an alternate radiograph. These coordinates were used to compute a transformation matrix which mathematically “bent” the alternate radiograph to fit the reference radiograph in 44 pairs of non-standardized radiographs. Comparison of direct measurements of bone loss in reference and alternate radiographs revealed a mean error of 0.55 mm. This error was significantly reduced to 0.15 mm when direct measurements in reference films were compared to transformed measurements on the alternate radiograph. These data indicate the transformation method may be of value in comparing non-standardized radiographs.