Special B Mode Techniques; M-Mode; D-Mode (Pulsed Wave Doppler) - GE Voluson i BT06 Service Manual

GE
D KTI106052, R
IRECTION
5-2-4-1-1

Special B Mode Techniques

a.) HI (Coded Harmonic Imaging)
5-2-4-2

M-Mode

1.) RBI
see:
a.) DMA section
2.) RBF
see:
5-2-4-3

D-Mode (Pulsed Wave Doppler)

1.) RBI
-
-
a.) DMA section
2.) RBF
see:
5-10
10
EVISION
In one method of HI the RX-Frequency is doubled, so that the radial resolution is increased
due to the higher RX-Frequency.
The second method of HI is pulse-inversion: 2 TX-Beams are shot to the same Tissue-location,
one with positive, one with negative polarity. The subtraction of both shots (Subtraction Filter)
brings to bear the nonlinear-echo-reflection-properties of the tissue, which is very useful with
extremely difficult-to-image patients.
5-2-4-1 B-Mode
B-mode-Data from RBI is written via SP0 into SDRAM Fifo Buffer memory. DMA Controller 1
transfers the data into PC main memory where scan conversion is performed per software,
i.e. the sweep image is generated (scaling and interpolation between lines).
CineMode: CineMode-Memory is the PC main memory.
5-2-4-1 B-Mode
PRF-generator; see: 5-2-4-1 B-Mode
After DC-cancelling the signal is mixed with RX-Frequency and brought to LF-Spectrum,
where the LowPassFilter cuts HF.
Mixer and Magnitude-Calculator arrange Complex Demodulation.
D-mode-Data from RBI is written via SP1 into SDRAM Fifo Buffer memory. DMA Controller 1
transfers the data into PC main memory where scan conversion is performed per software,
i.e. the sweep image is generated (scaling and interpolation between lines).
CineMode: CineMode-Memory is the PC main memory.
5-2-4-1 B-Mode
Section 5-2 - General Information
V i / V e
OLUSON OLUSON
S M
ERVICE ANUAL