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GE M
S
EDICAL
YSTEMS
D
FC091194, R
IRECTION
5-3-5-4
Image Port
The purpose of the Image Port is to capture signal processed data from the Mid Processors or video
data from the VCR, and route this data to the appropriate locations.
Data from Mid Processors
1.) Data from the RFT Card and the SDP Card are transferred over the PipeLink in data packages
called Frames, Packets and Tuplets, all depending on size of the package.
2.) At the Image Port the Packet is collapsed. A Frame contains enough data to construct one frame
(e.g. one 2D frame), while one Tuplet contains enough data to construct one vector (e.g. one Color
vector). The size of the vectors will depend on data type.
3.) The Image Port demultiplexes the different types of data, groups the same types and maps them
into the proper ring buffers in the Image Memory located on the Image Port 2 card.
Data from VCR
1.) Video and S-VHS (both in PAL and NTSC format) from the VCR (or another video source) is first
digitized and then fed through a video multi-standard decoder providing decoded luminance (black
and white) and chroma (color) data.
2.) Data is then transferred to a ring buffer in the image memory where it later can be fetched by Scan
Converter for display on the system monitor.
Memory
Typically size of the Image Memory is 256 MBytes.
The Image Port board is the data source and the BEP is the data destinations.
Up to eight of the data sets below can be stored live simultaneously in the Image Memory in eight
different ring buffers.
•
2D Tissue data
•
Doppler data
•
M-Mode Tissue data
•
2D Flow data
•
M-Mode Color data
•
Trace data
•
Video Luminance data
•
Video Chroma data
•
RF data
5 - 8
02
EVISION
Section 5-3 - Front End Processor
V
7 / V
7 PRO S
IVID
IVID
ERVICE
M
ANUAL
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