MRI 图像上测量的胰腺 IPMN 体积是否比直径更具可重复性？在一个大型单机构队列中的评估。
Are pancreatic IPMN volumes measured on MRI images more reproducible than diameters? An assessment in a large single-institution cohort.
机构信息
Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins University School of Medicine, 600 N Wolfe St, Room 143, Baltimore, MD, 21287, USA.
Department of Pathology, Johns Hopkins Medical Institutions, 1550 Orleans Street, Baltimore, MD, 21231, USA.
出版信息
Eur Radiol. 2018 Jul;28(7):2790-2800. doi: 10.1007/s00330-017-5268-z. Epub 2018 Feb 5.
OBJECTIVES
To assess reproducibility of volume and diameter measurement of intraductal papillary mucinous neoplasms (IPMNs) on MRI images.
METHODS
Three readers measured the diameters and volumes of 164 IPMNs on axial T2-weighted images and coronal thin-slice navigator heavily T2-weighted images using manual and semiautomatic techniques. Interobserver reproducibility and variability were assessed.
RESULTS
Interobserver intraclass correlation coefficients (ICCs) for the largest diameter measured using manual and semiautomatic techniques were 0.979 and 0.909 in the axial plane, and 0.969 and 0.961 in the coronal plane, respectively. Interobserver ICCs for the volume measurements were 0.973 and 0.970 in axial and coronal planes, respectively. The highest intraobserver reproducibility was noted for coronal manual measurements (ICC 0.981) followed by axial manual measurements (ICC 0.969). For the diameter measurements, Bland-Altman analysis revealed the lowest interobserver variability for manual axial measurements with an average range of 95% limits of agreement (LOA) of 0.68 cm. Axial and coronal volume measurements showed similar 95% LOA ranges (8.9 cm and 9.4 cm, respectively).
CONCLUSIONS
Volume and diameter measurements on axial and coronal images show good interobserver and intraobserver reproducibility. The single largest diameter measured manually on axial images showed the highest reproducibility and lowest variability. The 95% LOA may help define reproducible size changes in these lesions using measurements from different readers.
KEY POINTS
• MRI measurements by different radiologists can be used for IPMN follow-up. • Both diameter and volume measurements demonstrate excellent interobserver and intraobserver reproducibility. • Manual axial measurements show the highest interobserver reproducibility in determining size. • Axial and coronal volume measurements show similar limits of agreement. • Manual axial measurements show the lowest variability in agreement range.
目的
评估磁共振成像（MRI）图像上胰管内乳头状黏液性肿瘤（IPMN）体积和直径测量的可重复性。
方法
三位读者使用手动和半自动技术，在轴位 T2 加权图像和冠状薄层导航重 T2 加权图像上测量了 164 个 IPMN 的直径和体积。评估了观察者间的可重复性和变异性。
结果
手动和半自动技术测量的最大直径的观察者间内组间相关系数（ICC）分别为轴位 0.979 和 0.909，冠状位 0.969 和 0.961。轴位和冠状位的体积测量观察者间 ICC 分别为 0.973 和 0.970。观察者内重复性最高的是冠状手动测量（ICC 0.981），其次是轴位手动测量（ICC 0.969）。对于直径测量，Bland-Altman 分析显示手动轴位测量的观察者间变异性最低，平均 95%一致性界限（LOA）范围为 0.68cm。轴位和冠状位体积测量显示出相似的 95%LOA 范围（分别为 8.9cm 和 9.4cm）。
结论
轴位和冠状位图像上的体积和直径测量具有良好的观察者间和观察者内可重复性。手动轴位图像上测量的单个最大直径具有最高的可重复性和最低的变异性。95%LOA 可帮助确定不同读者测量的这些病变的可重复性大小变化。
关键点
不同放射科医生的 MRI 测量可用于 IPMN 的随访。
直径和体积测量均具有良好的观察者间和观察者内可重复性。
手动轴位测量在确定大小方面具有最高的观察者间可重复性。
轴位和冠状位体积测量具有相似的一致性界限。
手动轴位测量在一致性范围内具有最低的变异性。
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