Reproducibility of linear tumor measurements using PACS: comparison of caliper method with edge-tracing method
Reproducibility of linear tumor measurements using PACS: comparison of caliper method with edge-tracing method
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DOI：
10.1007/s00330-003-2027-0
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发表时间：
2004-03-01
影响因子：
5.9
通讯作者：
Ransil, BJ
中科院分区：
文献类型：
--
作者：
Monsky, WL;Raptopoulous, V;Ransil, BJ
本研究的目的是评价在图像存档和通信系统（PACS）上进行电子卡尺线性肿瘤测量时观察者间和观察者内的可重复性，并将其与从肿瘤周长的圆周追踪获得的线性测量结果进行比较。三名放射科医生在两个不同的环境中测量了30名患者的64个肿块。使用电子卡尺测量长轴和垂直短轴。电子描记每个肿瘤的边缘，并通过计算机软件计算长轴和短轴。通过计算和比较初始和后续测量之间的平均差的绝对值来评价测量的再现性。当使用卡尺法时，两次长短轴测量值之间的平均差异+/-95%置信区间（CI）为3.8+/-2.6x3.1+/-1.8 mm，当使用肿瘤示踪法时为3.5+/-2.0x3.2+/-1.5 mm。肿瘤轴测量的个体观察者内重现性无统计学显著差异。无论是长轴还是短轴的单维测量结果显着更大或更小的观察者内的再现性。当比较卡尺和描记测量值时，总体平均差异（3.42+/-1.8 vs 3.38+/-1.4 mm）无统计学显著性。每个观察者的个体测量值之间存在密切相关性，无论这些测量值是由电子卡尺测量的，还是由电子描记法计算的（Pearson相关性在0.79和0.949之间）。当前的PACS系统允许可再现的线性、长轴或短轴肿瘤测量。无论是直接用电子卡尺测量还是根据肿瘤边缘描记计算，测量的重现性都没有显著差异。
The aim of this study was to evaluate inter- and intra-observer reproducibility when making electronic caliper linear tumor measurements on picture archiving and communications systems (PACS) and compare them with linear measurements obtained from circumferential tracing of tumor perimeter. Three radiologists measured 64 masses from 30 patients on body CT scans in two separate settings. Long axis and perpendicular short axis were measured using electronic calipers. The edge of each tumor was traced electronically and the long and short axes were calculated by computer software. The reproducibility of a measurement was evaluated by computing and comparing the absolute value of the mean difference between initial and subsequent measurements. The mean differences +/-95% confidence interval (CI) between two measurements of the long by short axis were 3.8+/-2.6x3.1+/-1.8 mm when the caliper method was used and 3.5+/-2.0x3.2+/-1.5 mm when the tumor tracing method was used. There was no statistically significant difference in individual intra-observer reproducibility of tumor axes measurements. Neither long- nor short-axis single-dimension measurements resulted in significantly greater or lesser intra-observer reproducibility. When comparing caliper and tracing measurements, the overall mean difference (3.42+/-1.8 vs 3.38+/-1.4 mm) was not statistically significant. There was close correlation between the individual measurements made by each observer whether these were made by electronic calipers and when these were calculated from electronic tracings (Pearson correlations between 0.79 and 0.949). Current PACS systems allow reproducible linear, long or short axis, tumor measurements. There is no significant difference in reproducibility of measurements whether these are made directly with electronic calipers or calculated from tumor edge tracings.