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Magnetic Resonance Imaging (MRI)
A preferred form of radiographic imaging for the examination soft tissue. The University of Wisconsin has a MRI gopher site.

Mean Opinion Score Testing (MOS Testing).
Provides a means of evaluating the subjective performance of voice and/or video transmission equipment using procedures as set out in ITU-T P.800 and the related standards, a test protocol provided by HEI.

Mean Time Between Failures (MTBF)
a measure of system or hardware reliability or availability.

Medical Diagnostic Imaging Support (MDIS)
The Medical Diagnostic Imaging Support System is a large enterprise filmless radiology imaging system that allows the creation of a virtual radiology service. This project has been renamed the Joint Medical Imaging Technology (JMIT) Office.

Medical Advanced Technology Management Office (MATMO)
Medical Advanced Technology Management Office, part of U.S. Army Medical Research and Materiel Command at Fort Detrick, Maryland. This is the staff office responsible for day-to-day operation of the DOD Telemedicine Test Bed and includes work on projects such as ProMed, T-Med, and the Telemedicine Validation Initiative. This office is now called the Telemedicine Research Lab (TRL).

Medical Informatics
The combination of computer science, information science, and the health sciences (medicine) designed to assist in the management and processing of data to support the delivery of health care. A simple definition: Computer applications in medical care. A more complex definition: Biomedical Informatics is an emerging discipline that has been defined as the study, invention, and implementation of structures and algorithms to improve communication, understanding and management of medical information. The end objective is the coalescing of data, knowledge, and the tools necessary to apply that data and knowledge to the decision-making process, at the time and place that a decision needs to be made. The focus on the structure and algorithms necessary to manipulate the information is what separates Biomedical Informatics from other medical disciplines where information content is the focus.

Medium
The substance across which data can be transmitted (optical fiber, copper wire, coaxial cable, microwaves, etc.)

Message Switching
A message (image or text) is divided into many parts and the parts are transmitted to the receiver separately. Once the parts are received they are put back together to form the message.

Microphone audio overlays playing tape audio
The ability to talk to the other end while using the VCR as the audio/video input source. In a telemedicine consult, this feature is valuable when playing a pre-recorded tape of a procedure or examination and the providers want to discuss what is being seen at the same time.

Microsoakable camera
An oddball term meaning that the camera can be sterilized by soaking in disinfectant solutions. This adds significantly to the camera's expense but may be necessary.

MIL-STD-188-131
US Military Nomenclature for compatible videoconferencing apparatus.

Mini-PACS
An image management system that focuses one or more of the digital modalities, such as an ultrasound mini-PACS, or one application areas such as neuroradiology

Modem access for remote diagnostic support
Indicates that a technical support center can call into the system on a separate modem line to perform remote diagnostics.
 
MODulator/DE-modulator (MODEM)
Enables transmission of digital data (by transforming it to and from analog waveforms) over standard analog phone lines and cable video systems.

Motion Compensation
see Motion Prediction.

Motion Picture Experts Group (MPEG)
  • An algorithm for the digital processing of full motion video. According to the NII vision, an accepted world standard for multiplexing video, audio, and data for digital television broadcasting.
  • A group of standards for compression and storage of motion video. MPEG-1 provides images of 240 lines x 360pixels/line, digital transfer rates up to 1.5 Mbps, and compression ratios of about 100:1. MPEG-2 provides a higher quality picture - 720 horizontal lines x 480 vertical lines (pixels/line). The MPEG-2 standard is used for HDTV, and will be used for cable broadcasts. See also Motion JPEG .

Motion Prediction
A type of interframe coding used by codecs to compress motion video. By examining statistics of previous video frame sequences, a prediction of the motion vector and rate-of-change for an object or group of pixels in the future is developed for subsequent frames. In H.261, the estimated vectors must terminate within the image while in H.263, they may extend outside the image bounds. Important at lower transmit bit rates, optional in H.261.

Multiplex
To sequentially incorporate several data streams into a single data stream in such a manner that each may later be recovered intact.
 
Multiplexer ("MUX")
A hardware device that divides a digital transmission stream into two or more subchannels. This can be done by frequency division (splitting the single band into multiple narrower bands) or by time division (allotting a common channel to several different transmitting devices one at a time). Compare IMUX.

Multipoint Control (or Conferencing) Unit = Bridge (MCU)
A device that enables participants at more than two sites to participate in voice or video which links three or more videoconference locations for fully-interactive audio, data and video teleconferencing. An ITU-T MCU must meet the requirements of H.231 and H.243. In addition, greater functionality for multipoint videoconferencing will be provided by the T.12x and T.13x suites of standards, desirable for both codec and MCU

 


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