我感觉超声波诊断仪的主机是指“设备的主要部分”，而host比较偏向于它的”主人“含义，为其他东西服务。比如托管hosting。（另，最早的计算机网络是伴随着主机(Host)和终端(Terminal)这两个概念的出现而产生的。见http://tech.sina.com.cn/it/2004-08-19/1132408185.shtml）
假设把主机、监视器、键盘、鼠标这些词放在一起翻译，我会更偏向翻译成：main unit, monitor, keybord and mouse。欢迎拍砖！
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Main Unit
Explanation: FYI
Alvin Liu China Local time: 08:34 Native speaker of: Chinese PRO pts in category: 8
Explanation: http://www.virtualsciencefair.org/2003/guilh3m/public_html/c...
Central Processing Unit (CPU)
The CPU is the hub of an ultrasound machine. The CPU is like a computer that contains the microprocessor, memory, amplifiers and power supplies for the microprocessor and transducer probe. The transducer receives electrical currents from the CPU and sends electrical pulses that are created by returning echoes. The CPU does all of the calculations to produce an image on the monitor, and also stores the processed information on a disk.
http://www.dimensionsofdentalhygiene.com/ddhright.asp?id=797
The main components of ultrasound equipment are the display/output device; the transducer, which is responsible for emitting and receiving sound waves; and the central processing unit.
-------------------------------------------------- Note added at 15 hrs (2008-06-21 16:42:30 GMT) --------------------------------------------------
P.S. main frame isnot applicablehere,because ultrasounds are all stand alone machines and are not interconnected (LAN/internet/etc.).
karcsy Philippines Local time: 08:34 Native speaker of: Chinese PRO pts in category: 8
Explanation: Summarily from what other answerers have conceived, I find the most appropriate target term to be the simplest: main computer. Real-time imaging/processing of ultrasonography in general clinical applications, is operated using a main computer [1] with a frame-grabber or an imaging software. The transmission or analysis of a large quanitity of diagnostic data in larger clinical settings, where other instruments/operators are involved, requires a "mainframe computer" or a "multiprocessor workstation" [2]. The latter two architectures integrate other devices interconnected by direct communication lines [3].
Thus in this case, the term "Main computer" appears to be the most suitable choice.
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