GE Voluson 730, Руководство по обслуживанию

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GE M
EDICAL
S
YSTEMS
- K
RETZTECHNIK
U
LTRASOUND
D
IRECTION
105844, R
EVISION
1 V
OLUSON
® 730 S
ERVICE
M
ANUAL
Chapter 5 Components and Functions (Theory) 5-11
b.) THI = HAR (Tissue Harmonic Imaging)
Generally with THI the RX-Frequency is doubled, so that the axial resolution is increased due
to the higher RX-Frequency. Another step of THI is the pulse-inversion: 2 TX-shots are placed
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-scan patients.
c.) CRI (Contrast Resolution Imaging)
Does not need any special functions of CPG.
Image is composed of Single different-direction-steered images. PC-calculated.
d.) VCI (Volume Contrast Imaging)
Does not need any special functions of CPG.
Image is composed of single at close range placed images. PC-calculated.
(Only possible with 4D-Probes).
4.) CPF
Has no function in B-Mode.
5.) CPS
B-mode-Data from CPG are written into Line Memory (Cine Mode-Mem). The DSC
(Dig.ScanConverter) reads out the Lines and writes them scan converted (A-mode-polar to B-
mode-cartesian) into the Frame Memory. From there the non deflected Image can be read out and
overlaid with the rest of the Monitor-Image. see:
6.) CKV
Cine Mode: Same, Cine Mode-Memory is the Line Memory.
6.) CKV
Is the Graphic Board of the PC. Special function for B-MODE: The above mentioned overlay-
function is performed here.
5-2-4-2 M-Mode
1.) CPC
see: 5-2-4-1 B-Mode
2.) CPR
see: 5-2-4-1 B-Mode
3.) CPG
see: 5-2-4-1 B-Mode
4.) CPF
see: 5-2-4-1 B-Mode
5.) CPS
M-mode-Data from CPG are written into Line Memory (Cine Mode-Mem). The DSC
(Dig.ScanConverter) reads out the Lines and writes them into the Frame Memory. From there the
Lines can be read out and overlaid with the rest of the Monitor-Image. see:
6.) CKV
Cine Mode: Same, Cine Mode-Memory is the Line Memory.
6.) CKV
see: 5-2-4-1 B-Mode