Soble J S, Yurow G, Brar R, Stamos T, Neumann A, Garcia M, Stoddard M F, Cherian P K, Bhamb B, Thomas J D
Rush-Presbyterian-St. Luke's Medical Center, Chicago, Illinois 60612, USA.
J Am Soc Echocardiogr. 1998 Aug;11(8):819-25. doi: 10.1016/s0894-7317(98)70057-4.
Digital recording of echocardiographic studies is on the clinical horizon. However, full digital capture of complete echocardiographic studies in traditional video format is impractical, given current storage capacity and network bandwidth. To overcome these constraints, we evaluated the diagnostic image quality of digital video by using MPEG (Motion Picture Experts Group) compression.
Fifty-eight complete, consecutive studies were recorded simultaneously with the use of MPEG-1 and sVHS videotape. Each matched MPEG and sVHS study pair was reviewed by two from a total of six readers, and findings were recorded with the use of a detailed, computerized reporting tool. Intrareader and interreader discrepancies were characterized as major or minor and analyzed in total and for specific subgroups of findings (left and right ventricular parameters, valvular insufficiency, and left ventricular regional wall motion). Intrareader discrepancies were reviewed by a consensus panel for agreement with either MPEG or sVHS findings. There was an exact concordance between MPEG and sVHS readings in 83% of findings. The majority of discrepancies were minor, with major discrepancies in only 2.7% of findings. There was no difference in the rate of consensus panel agreement with MPEG or sVHS for instances of intrareader discrepancy, either in total or for any subgroup of findings. Interreader discrepancy rates were nearly identical for both MPEG and sVHS.
MPEG-1 digital video is equivalent to sVHS videotape for diagnostic echocardiography. MPEG increases the range of practical options for digital echocardiography and offers, for the first time, the advantages of digital recording in a familiar video format.
超声心动图研究的数字记录即将应用于临床。然而，鉴于目前的存储容量和网络带宽，以传统视频格式对完整的超声心动图研究进行全数字捕获是不切实际的。为克服这些限制，我们使用MPEG（运动图像专家组）压缩技术评估了数字视频的诊断图像质量。
使用MPEG-1和sVHS录像带同时记录了58项完整的连续研究。从总共6名读者中挑选出2名对每对匹配的MPEG和sVHS研究进行评估，并使用详细的计算机报告工具记录结果。读者内和读者间的差异被分为主要或次要差异，并对所有结果以及特定结果亚组（左心室和右心室参数、瓣膜反流和左心室节段性室壁运动）进行分析。对于读者内差异，由一个共识小组审查以确定与MPEG或sVHS结果的一致性。83%的结果在MPEG和sVHS读数之间完全一致。大多数差异为次要差异，仅2.7%的结果为主要差异。对于读者内差异的情况，无论是总体还是任何结果亚组，共识小组与MPEG或sVHS的一致率均无差异。MPEG和sVHS的读者间差异率几乎相同。
对于诊断性超声心动图，MPEG-1数字视频等同于sVHS录像带。MPEG增加了数字超声心动图的实际选择范围，并首次提供了以熟悉的视频格式进行数字记录的优势。
