GE HEALTHCARE
DIRECTION FC091194, REVISION 11 VIVID 7 SERVICE MANUAL
Chapter 5 - Components and Functions (Theory) 5 - 11
5-3-9 Transmitter and Receiver Subsystem (cont’d)
5-3-9-3 Phased, Linear and Convex Array Probes
• The Phased, Linear and Convex array probes consist of several identical transducer elements (e.g.
64, 128, 192).
• Three probes can be connected to the system at the same time. The probe connectors are
physically located on the Relay Board, where one of them is selected and connected to the
transmitter (TX board) and receiver (RX board) through a number of relays.
•See "Probes" on page 9-80 for a list of available probes.
5-3-9-4 Receiver Signal Path
• The reflected signal from body structures and blood cells are routed from the probe, via the Relay
board over the Transducer Bus to the RX (receiver) board, where pre amplification (20dB) and
Analog Time Gain Compensation (ATGC) (-10 - +30 dB) is performed. Gain is determined by an
analog signal (ATGC) generated by the Front-End Controller board (FEP1) or by the Radio
Frequency Interface board (FEP2).
• On the very input of the RX board are transmit/receive (T/R) switches to prevent the transmitters
from destroying the receivers.
• The output channels from the RX board are fed to the Beam Former boards. Each Beam Former
board performs A/D conversion of 64 channels.
Figure 5-7 The Ultrasound Receiver
RELAY
BOARD
RX128
TX128
FRONT-END CONTROLLER
(UNITS WITH FEP1)
RFI BOARD
(UNITS WITH FEP2
PROBES
DOPPLER PROBE
DIGITIZED RECEIVED
ULTRASOUND SIGNALS TO:
- RFT BOARD
(UNITS WITH FEP1)
- RFI BOARD
(UNITS WITH FEP2)
XD_BUS
BF64
FE_BUS
T/R
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