Šta je kolor dopler slika protoka?
Dopler slika protoka u boji (CDFI), također poznata kao dvodimenzionalni dopler, koristi faznu detekciju, autokorelaciju i kodiranje u nijansama sive boje za prosječnu vrijednost. Podaci o brzini krvotoka se prikazuju u boji i kombinuju i nadograđuju na B{ {1}}slika u sivim tonovima. On intuitivnije prikazuje protok krvi i može prikazati svojstva protoka krvi i distribuciju brzine protoka u srcu i krvnim žilama brže i intuitivnije od pulsnog doplera. Ima jedinstvene prednosti u prikazu krvotoka lijevo-na-desnog šanta i krvotoka regurgitacije ventila. Ali kvantifikacija protoka krvi nije tako dobra kao pulsni i kontinuirani dopler.
Color Doppler flowmeter, like pulse wave and continuous wave Doppler, also uses the Doppler effect between red blood cells and ultrasound to achieve imaging. Color Doppler flowmeter includes two-dimensional ultrasound imaging system, pulse Doppler (one-dimensional Doppler) blood flow analysis system, continuous wave Doppler blood flow measurement system and color Doppler (two-dimensional Doppler) ) blood flow imaging system. The oscillator generates two quadrature signals with a difference of π/2, which are respectively multiplied by the Doppler blood flow signal. , after removing the low-frequency components generated by the vessel wall or valve, etc., it is sent to the autocorrelator for autocorrelation detection. Since each sampling contains the Doppler blood flow information produced by many red blood cells, the obtained signal is a mixed signal of multiple blood flow velocities after autocorrelation detection. The autocorrelation detection results are sent to the velocity calculator and the variance calculator to obtain the average velocity, which is stored in the digital scan converter (DSC) together with the blood flow spectrum information and two-dimensional image information after FFT processing. Finally, according to the direction and velocity of blood flow, the color processor encodes the blood flow data as pseudo-color and sends it to a color monitor for display, thereby completing color Doppler blood flow imaging.
Izvor informacija o ehou dobijenih kolor doplerskim snimanjem toka je u skladu sa spektralnim doplerom, distribucija i smjer protoka krvi prikazani su u dvije dimenzije, a različite brzine se razlikuju različitim bojama. Duplex Doppler ultrazvučni sistem, koji predstavlja ultrazvučnu sliku B-režima koja pokazuje lokaciju krvnih sudova. Dopler mjeri protok krvi, a ova kombinacija B-moda i Doppler sistema može preciznije locirati bilo koji krvni sud.
