GE MEDICAL SYSTEMS - KRETZTECHNIK DRAFT VOLUSON® 730PRO / 730PROV (BT´04)
D
IRECTION KTI105947, REVISION 2 SERVICE MANUAL
Chapter 5 - Components and Functions (Theory) 5-13
5-2-4-3 D-Mode (Pulsed Wave- and Continuous Wave Doppler)
1.) CRS
- 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.
- Arranges the FFT. D-Mode Data uses the dedicated 8-bit Bus SP1 to the CKV.
2.) CPR
see: 5-2-4-1 B-Mode
3.) CKV - DMA section
D-mode-Data from CRS 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.
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.
4.) CKV - Video section
see: 5-2-4-1 B-Mode
5-2-4-4 D-Mode Autotrace (draws PC-calculated envelope to D-Spectrum)
(ECG-Curve is similar to Autotrace-Curve)
1.) CRS
- 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.
- Arranges the FFT. D-Mode Data use the dedicated 8-bit Bus SP1 to the CKV.
2.) CPR
see: 5-2-4-1 B-Mode
3.) CKV - DMA section
D-mode-Data from CRS is written via SP1 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.
4.) CKV - Video section
see: 5-2-4-1 B-Mode
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