GE Voluson E6

GE HEALTHCAREDRAFT VOLUSON E8 / VOLUSON E6
D
IRECTION KTD102576, REVISION 7 DRAFT (AUGUST 23, 2012) SERVICE MANUAL
Chapter 5 - Components and Functions (Theory) 5-13
5-2-3-3 D-Mode (Pulsed Wave- and Continuous Wave Doppler)
1.) RFI
- PRF-generator; see: 5-2-3-1 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.
a.) DMA section
D-mode-Data from RFI 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 PC main memory.
CineMode with ECG: CineMode-Memory for the ECG-Curve is inside PC-Memory.
Software has to take care that D-Mode-Image and ECG-Curve are placed exactly one upon
the other, means: have the same Cine-Shift.
2.) RTV - Video section
see: 5-2-3-1 B-Mode
5-2-3-4 D-Mode Autotrace (draws PC-calculated envelope to D-Spectrum)
(ECG-Curve is similar to Autotrace-Curve)
1.) RFI
- PRF-generator; see: 5-2-3-1 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 use the dedicated 16-bit Bus SP0 to the RTV.
a.) DMA section
D-mode-Data from RFI is written via SP0 into SDRAM Fifo Buffer memory.
PC calculates Autotrace-Curve from D-Mode data.
Cine Mode with Autotrace/ECG: Cine Mode-Memory for the Autotrace/ECG-Curve is inside
PC-Memory.
Software has to take care that D-Spectrum and Autotrace/ECG-Curve are placed exactly one
upon the other, means: have the same Cine-Shift.
2.) RTV - Video section
see: 5-2-3-1 B-Mode