Baxter Jonathan A, Barlow Timothy, Karthikeyan Shanmugam, Mayo Damian J, King Richard J
Department of Trauma and Orthopaedic Surgery, Queen's Medical Centre, Nottingham University Hospitals NHS Trust, Nottingham, UK.
Hip Int. 2012 Jan-Feb;22(1):82-9. doi: 10.5301/HIP.2012.9044.
We have investigated the accuracy of automatic calibration of digital pelvic radiographs using the single and double marker techniques. Both markers were applied by the radiographer at the time of routine, postoperative radiographs. Each radiograph was loaded into the TraumaCad(TM) software package which calculated the magnification and scaled the radiograph automatically. The median error of magnification in the double marker group was 1.14% when calculated automatically. The median error of the single marker was 5.98%. The relationship between true and predicted magnification was strongest in the double marker group with excellent correlation (r=0.91) and agreement (ICC<0.91). We believe that the double marker method with automatic calibration is the most reliable method of scaling a pelvic radiograph in clinical practice currently available.
我们使用单标记和双标记技术研究了数字骨盆X线片自动校准的准确性。两种标记均由放射技师在术后常规X线检查时应用。每张X线片被加载到TraumaCad(TM)软件包中，该软件会自动计算放大倍数并对X线片进行缩放。双标记组自动计算时放大倍数的中位数误差为1.14%。单标记的中位数误差为5.98%。双标记组中真实放大倍数与预测放大倍数之间的关系最强，具有极佳的相关性(r=0.91)和一致性(组内相关系数<0.91)。我们认为，具有自动校准功能的双标记方法是目前临床实践中缩放骨盆X线片最可靠的方法。
