| | 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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