Network latency and operator performance in teleradiology applications.
Network latency and operator performance in teleradiology applications.
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远程放射学应用中的网络延迟和操作员性能。
DOI：
10.1007/bf03168384
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发表时间：
2000
影响因子：
4.4
通讯作者：
Huang,HK
中科院分区：
文献类型：
--
作者：
Stahl,JN;Tellis,W;Huang,HK
远程放射学应用程序通常使用带有远程控制鼠标指针的交互式会议模式。当电话用于语音通信时，数据网络的延迟会在鼠标指针的位置和口头通信之间产生时间上的差异。为了评估这种分离的影响，我们检查了5名测试者在不同的模拟网络条件下执行简单的远程放射学任务的表现。当网络延迟超过400毫秒时，测试人员的性能下降，出错次数增加。对于可能发生在网络路径上的恒定延迟和由Nagle算法（TCP/IP协议使用的一种内部缓冲方案）引起的可变延迟，这种影响是相同的。由于在典型的TCP/IP实现中使用的Nagle算法在发送数据包之前会导致大约300毫秒的延迟，因此网络中任何100毫秒或更长时间的额外延迟都会导致远程放射学应用中操作员性能下降。这些情况经常发生在公共互联网或海外连接上。为了获得最佳性能，作者建议在远程放射学应用中绕过Nagle算法。
Teleradiology applications often use an interactive conferencing mode with remote control mouse pointers. When a telephone is used for voice communication, latencies of the data network can create a temporal discrepancy between the position of the mouse pointer and the verbal communication. To assess the effects of this dissociation, we examined the performance of 5 test persons carrying out simple teleradiology tasks under varying simulated network conditions. When the network latency exceeded 400 milliseconds, the performance of the test persons dropped, and an increasing number of errors were made. This effect was the same for constant latencies, which can occur on the network path, and for variable delays caused by the Nagle algorithm, an internal buffering scheme used by the TCP/IP protocol. Because the Nagle algorithm used in typical TCP/IP implementations causes a latency of about 300 milliseconds even before a data packet is sent, any additional latency in the network of 100 milliseconds or more will result in a decreased operator performance in teleradiology applications. These conditions frequently occur on the public Internet or on overseas connections. For optimal performance, the authors recommend bypassing the Nagle algorithm in teleradiology applications.