Doppler amplitude-coded color

Fig. 19.4. Amplitude-coded color Doppler sonography in glomerulonephritis ( halo -sign ). Amplitude-coded color Doppler sonography demonstrates a small cortical peripheral rim- or halo-like layer with no color signals, indicating peripherally reduced flow (in spite of normal R1 values) in a patient with glomerulonephritis...

Fig.19.6a,b. Sonographic findings in lupus nephritis, a Unspecific changes of the renal parenchyma with reduced vasculature on color Doppler sonography and increased RI (peripheral RI = 0,75) on duplex Doppler in acute severe lupus nephritis, b Normalization of renal vasculature on amplitude-coded color Doppler sonography with improvement of peripheral RI during treatment (prior to clinical normalization)... 

Fig. 19.7a,b. Renal sonography in sickle cell disease, a Increased echogenicity of the medulla with consecutively inverted corticomedullary differentiation. In the absence of hypercalciuria, this pattern is typical for sickle cell nephropathy. b Amplitude-coded color Doppler sonography of the right kidney (cross section) shows a segmental parenchymal area without colour signals (arrow), consistent with a renal infarction in sickle cell disease... 

History 422 Clinical Status 424 Laboratory Investigations 424 Diagnostic Imaging 424 Basic Situation 424 Ultrasound 424 Doppler Sonography and Amplitude-Coded Color Doppler Sonography 425... 

Doppler Sonography and Amplitude-Coded Color Doppler Sonography... 

Fig. 7.5 P rinciple of SAE. Using high-amplitude sound pressure, the shell of the microcapsules breaks and the air bubble disintegrates rapidly. The sudden disappearance of the microbubble is misinterpreted by the ultrasound machine as a quick movement and color-coded in the image. This pseudo-Doppler effect is known as SAE.

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