Esaote O-scan eXP, User Manual

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350004900 Rev. 07 15 / 20
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T
echnical Description
cooled.
Control system: Digital based on DSP SHARC 21161(600
MIPS, 600 MFLOPS, 128 KB)
4 indipendent channels (X - Y - Z - B0)
DAC 18 bit - update every 7,2
P
s
Ramp generation - induced current
compensation pre-emphasis - adjustable
delay
Calibration procedure: all calibrations of the gradient system are
managed by the console on various levels of
automation
Magnetic compensation system (optional):
“open loop” control of variations in magnetic
field via external measurement (AC and DC
sensors), digital processing of signal in
separate channels (DC - 50/60 Hz - 16.6 Hz)
and correction actuation with Bo coil.
Light electronics based on DSP SHARC
21161
Radiofrequency system
DPA receiving coils: Knee Coil 1:
15 x 7,2 x 16,8 (int) cm (w x d x h)
17,2 x 22,1 x 28,6 (ext) cm (w x d x h)
hand/wrist coil 2 (optional):
9,35 x 27,6 x 15,4 (int) cm (w x d x h)
17,3 x 27,6x 24,6 (ext) cm (w x d x h)
ankle coil 3:
7,15 x 19,85 x 11,8 (int) cm (w x d x h)
15,3 x 23 x 24,3 (ext) cm (w x d x h)
Gantry: enables rapid positioning and efficient
shielding to attenuate environmental RF noise;
enables connection of the receiving coil with
the quick connector and coil recognition
Reception chain: 2 indipendent channels
noise figure <1 dB
bandwidth at 0.5 dB: 600 KHz (13 MHz ±
300 KHz)
maximum output signal from
coil/preamplifier system: -3 dBm
gain of chain programmable in a range of
70 dB with two variable gain stages, each on
256 levels
A/D conversion and demodulation: RF signal conversion at 3 MHz
sampling 14 bit 20 MHz
digital demodulation in phase and