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首页> 外文期刊>Journal of Digital Imaging >Magnetic Resonance Imaging Research in Sub-Saharan Africa: Challenges and Satellite-Based Networking Implementation
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Magnetic Resonance Imaging Research in Sub-Saharan Africa: Challenges and Satellite-Based Networking Implementation

机译：撒哈拉以南非洲磁共振成像研究：挑战和基于卫星的网络实施

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As part of an NIH-funded study of malaria pathogenesis, a magnetic resonance (MR) imaging research facility was established in Blantyre, Malaŵi to enhance the clinical characterization of pediatric patients with cerebral malaria through application of neurological MR methods. The research program requires daily transmission of MR studies to Michigan State University (MSU) for clinical research interpretation and quantitative post-processing. An intercontinental satellite-based network was implemented for transmission of MR image data in Digital Imaging and Communications in Medicine (DICOM) format, research data collection, project communications, and remote systems administration. Satellite Internet service costs limited the bandwidth to symmetrical 384 kbit/s. DICOM routers deployed at both the Malaŵi MRI facility and MSU manage the end-to-end encrypted compressed data transmission. Network performance between DICOM routers was measured while transmitting both mixed clinical MR studies and synthetic studies. Effective network latency averaged 715 ms. Within a mix of clinical MR studies, the average transmission time for a 256 × 256 image was ~2.25 and ~6.25 s for a 512 × 512 image. Using synthetic studies of 1,000 duplicate images, the interquartile range for 256 × 256 images was [2.30, 2.36] s and [5.94, 6.05] s for 512 × 512 images. Transmission of clinical MRI studies between the DICOM routers averaged 9.35 images per minute, representing an effective channel utilization of ~137% of the 384-kbit/s satellite service as computed using uncompressed image file sizes (including the effects of image compression, protocol overhead, channel latency, etc.). Power unreliability was the primary cause of interrupted operations in the first year, including an outage exceeding 10 days.
机译：作为由美国国立卫生研究院（NIH）资助的疟疾发病机制研究的一部分，在马拉尼州的布兰太尔建立了磁共振（MR）成像研究设施，以通过应用神经病学MR方法来增强小儿脑疟疾患者的临床特征。该研究计划要求每天将MR研究成果传输至密歇根州立大学（MSU），以进行临床研究解释和定量后处理。建立了一个洲际卫星网络，用于以医学数字成像和通信（DICOM）格式传输MR图像数据，研究数据收集，项目通信和远程系统管理。卫星Internet服务成本将带宽限制为对称384 kbit / s。部署在Mala i MRI设施和MSU上的DICOM路由器管理端对端加密的压缩数据传输。在传输混合临床MR研究和综合研究的同时，还测量了DICOM路由器之间的网络性能。有效网络延迟平均为715毫秒。在一系列临床MR研究中，256×256图像的平均传输时间为〜2.25和512×512图像的〜6.25 s。通过对1,000张重复图像的综合研究，对于256×256图像，四分位间距为[2.30，2.36] s，对于512×512图像为[5.94，6.05] s。 DICOM路由器之间临床MRI研究的传输平均每分钟9.35张图像，这表示使用未压缩的图像文件大小（包括图像压缩效果，协议开销）计算得出的384 kbit / s卫星服务的有效频道利用率约为137％ ，频道延迟等）。电源不可靠性是第一年中断运行的主要原因，包括中断时间超过10天。

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