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The
doppler module enables following presentations:
- PW (Pulsed Wave Doppler)
- CF (Color Flow)
- PF (Power Flow)
The PW presentation enables exact survey of the speed
of the blood flow in a sample gate(Sample Volume). It
can be shown in the B+D mode(PW next to B presentation)
or B/D mode(PW below the B presentation)
The CF presentation enables easy determination of the
place and the direction of the flow and fast valuation
of the flow speed. To the doppler echoes is attributed
the bicolour scale of colours. To the flows to the
probe are attributed red shades and from the probe
blue shades.
The PF presentation enables easy determination of
place and power of the flow. To the doppler echoes is
attributed the unicoloured scale of colour(mostly in
yellow shades). To the flows with the high power are
attributed light shades and to the flows with the low
power of signal darker shades.
The PF presentation has more sensitivity than CF
presentation.
For easier location of vessels the Triplex type
presentation is possible - simultaneously B+CF/PF and
PW presentations. The B+CF/PF mode serves to fast
location of the place of the flow, to place the sample
gate(Sample Volume) and afterwards quick switch to the
PW mode to exactly analize the FFT and to survey the
speed.
The doppler module cooperates as well with mechanical
probes(only the PW presentation) as with electronical
probes(all presentation available:PW, CF, PF)
Basic technical parameters:
-modes: PW, CF, PF
- PRF range: 0,8 kHz...12kHz
- Doppler frequency : 2.5 MHz , 3.125MHz , 5.0 MHz ,
6.25MHz
- maximum flow speed(for 0°):
Doppler 2,5 MHz: +/- 1,85 m/s (max. 3.7 m/s using Base
Line Shift)
Doppler 3,125 MHz: +/- 1,48 m/s (max. 2.96 m/s using
Base Line Shift)
Doppler 5,0 MHz: +/- 0,92 m/s (max. 1.84 m/s using
Base Line Shift)
Doppler 6,25 MHz: +/- 0,74 m/s (max. 1.48 m/s using
Base Line Shift)
The PW mode:
- the width of sample gate SV: 1 ... 10 mm
- 256 points FFT transform
- FFT gain
- FFT inverse , reject and scale processing
- 3 scroll speeds
- Wall Filters - depended on PRF; from 50 to 2000 Hz
- Base Line Shift
- the angle correction on the image in FREEZE and RUN
modes
- digital processing of audio track and regulation of
audio track
volume
The CF/PF mode:
- Color/Power gain
- regulation of persistence degree(corelation)Color/Power
- regulation of resolution of CF/PF modes
- regulation of echo's priority
- reject function
- choise of colour's map, diversion of colour's map(inverse)
Measurements functions in PW Doppler mode:
- speeds of time and acceleration(two pairs of cursors)
- frequency of heart beat
- of gradients: maximal MaxPG and MeanPG
- of surface: mitral valve MVA and time of
half-duration PHT
- of indexes: pulsation PI, resistance RI i A/B
- distances in B presentation
- rate of mitral valve
All measurements taken in PW Doppler mode are saved on
the seperate page of measurement report. |
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