Schippers 1609875, Руководство пользователя

Страница: 34 / 132

34
2.3 Technical specification
Model 1609875 MS Multiscan digital
Probes
Probe in standard
configuration Optional probes
S2/3.5MHzMechanical
sector scan S2/5.0MHzMechanical
sector scan
Displayed Depth (mm) 192 192
Maximal detect depth
(mm) ≥140 ≥80
Resolution
(mm)
Lateral
≤4 (depth≤80)
≤5 (80
＜ depth≤130)
≤3 (depth≤60)
Axial ≤2 (depth≤80) ≤1 (depth≤60)
Blind area (mm) ≤8 ≤8
Geometric
position
Precision
%)
Horizontal ≤20 ≤15
Vertical ≤10 ≤10
Monitor size (inch) 5.0 TFT-LCD
Display modes
B 、 B+B 、 B+M 、 M
Image gray scale 256 levels
Depth (mm)
120 ～ 190
Measure functions
Distance, circumference, area, volume, heart rate,
gestation age
Character display Company name, Age, Sex
Battery capacity 2200mAh
Mainframe power
consumption 13W at non-charging operation / 25W at charging
operation
Adapter power
consumption 45W
Mainframe
weight(Excl.probe) 800g
2.4 Basic Principles
The principles of B mode scanning are as follows: human/animal organs have differing
densities and ultrasound speeds, i.e. their level of acoustic impedance varies (= average
density x acoustic speed). The piezoelectric crystal (transducer) is triggered by an electrical
pulse to produce an ultrasound wave of definite frequency. The ultrasound wave is
transmitted into the body. An echo wave is formed when the ultrasound wave passes through
the surface of different organs. These echoes, with different amplitudes, are received back via
the same transmitting transducer. The receiving echoes (acoustic energy) are converted into
electrical pulses. After the pulses are amplified, demodulated and DSC, etc., a standard video
signal is formed and a sectional image of the organ is displayed on the monitor screen.