GE HEALTHCARE - KRETZTECHNIK VOLUSON® 730EXPERT (BT03)
D
IRECTION 105899, REVISION 3 DRAFT (APRIL 29, 2008) SERVICE MANUAL
5-12 Section 5-2 - General Information
5-2-4-1-1 Special B-Mode Techniques
a.) THI = HI
(Tissue Harmonic Imaging incl. Coded Harmonics)
In one method of THI the RX-Frequency is doubled, so that the radial resolution is increased
due to the higher RX-Frequency.
The second method of THI 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
(especially in usage of Contrast-medias), which is very useful with extremely difficult-to-image
patients.
b.) FFC (Frequency and Focus Composite)
2 or more TX-Beams are shot to the same Tissue-location. The Beams have different TX-foci.
By means of Blending (adaption of Brightnesses) they are composed to one whole RX-Line.
c.) CRI (Compound Resolution Imaging)
Does not need any special functions of CRS.
Image is composed of more than one different-direction-steered images. PC-calculated.
d.) VCI (Volume Contrast Imaging): Does not need any special functions of CRS.
Image is composed of more than 2 small angle neighbored images. PC-calculated.
(Only possible with 4D-Probes).
5-2-4-2 M-Mode
1.) CRS
see: 5-2-4-1 B-Mode
2.) CPR
see: 5-2-4-1 B-Mode
3.) CKV - DMA section
B-mode-Data from CRS 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.
CineMode with ECG: CineMode-Memory for the ECG-Curve is inside PC-Memory.
Software has to take care that M-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
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