GE Voluson P8 - 5-2-3-2 M-Mode; 5-2-3-3 D-Mode (Pulsed Wave- and Continuous Wave Doppler); 5-2-3-4 D-Mode Autotrace (draws PC-calculated envelope to D-Spectrum)

GE HEALTHCAREDRAFT VOLUSON® P8 / VOLUSON® P6
DIRECTION 5459672-100, R
EVISION 6 DRAFT (JANUARY 17, 2013) PROPRIETARY SERVICE MANUAL
Chapter 5 - Components and Functions (Theory) 5-13
b.) XBEAM CRI (CrossBeam - Compound Resolution Imaging):
Does not need any special functions of RFS.
Image is composed of more than one different-direction-steered images. PC-calculated.
5-2-3-2 M-Mode
1.) RFS
see: Section 5-2-3-1 "B-Mode" on page 5-12
a.) DMA section
B-mode-Data is written via SP0 into SDRAM Fifo Buffer memory. DMA Controller 1 transfers
the data into SOM (System-On-Module) 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 SOM main memory.
5-2-3-3 D-Mode (Pulsed Wave- and Continuous Wave Doppler)
1.) RFS
- PRF-generator; see: Section 5-2-3-1 "B-Mode" on page 5-12
- 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.
a.) DMA section
D-mode-Data is written via SP0 into SDRAM Fifo Buffer memory. DMA Controller 1 transfers
the data into PC main memory where FFT and scan conversion is performed per software,
i.e. the sweep image is generated (scaling and interpolation between lines).
CineMode: CineMode-Memory is the SOM main memory.
5-2-3-4 D-Mode Autotrace (draws PC-calculated envelope to D-Spectrum)
1.) RFS
- PRF-generator; see: Section 5-2-3-1 "B-Mode" on page 5-12
- 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.
a.) DMA section
D-mode-Data is written via SP0 into SDRAM Fifo Buffer memory.
PC calculates Autotrace-Curve from D-Mode data.
Cine Mode with Autotrace: Cine Mode-Memory for the Autotrace-Curve is inside SOM-
Memory.
Software has to take care that D-Spectrum and Autotrace-Curve are placed exactly one upon
the other, means: have the same Cine-Shift.