Duplex sonography, color-coded

Lu CJ, Kao HL, Sun Y, Liu HM, Jeng JS, Yip PK, Lee YT. The haemodynamic effects of internal carotid artery stenting a study with color-coded duplex sonography. Cerebro-vasc Dis 2003 15 264-269. 

Baumgartner RW, Baumgartner I, Mattie HP et al (1997) Transcranial color-coded duplex sonography in the evaluation of collateral flow through the circle of Willis. Am J Neuro-radiol 18 127-133... 

Baumgartner RW (1999). Transcranial color-coded duplex sonography. Journal of Neurology 246 637-647 Baumgartner RW, Mattie HP, Aaslid RC et al (1997). Transcranial colour-coded duplex sonography in arterial cerebrovascular disease. Cerebrovascular Diseases 7 57-63 Bishop CCR, Powell S, Insall MC et al (1986). Effect of internal carotid artery occlusion on middle cerebral artery blood flow at rest and in response to hypercapnia. Lancet i 710-712... 

Acute reduction in renal perfusion is considered important in the pathophysiology of contrast agent-induced nephrotoxicity. Color-coded duplex sonography has been used in assessing intrarenal vascular resistance in 10 patients (mean age 51 years) after intravenous injection of 100 ml of the low-osmolar contrast medium iopamidol (iodine 300 mg/ml) (182). The resistive index was measured at 1-minute intervals over 10 minutes after injection in each patient. There was a statistically significant rise in resistive index at 2, 3, 4, and 5 minutes after injection, mean values 0.74, 0.75, 0.72, and 0.75... 

Hetzel GR, May P, Hollenbeck M, Voiculescu A, Modder U, Grabensee B. Assessment of radiocontrast media induced renal vasoconstriction by color coded duplex sonography. Ren Fail 2001 23(l) 77-83. 

In addition to B-mode sonography flow-depended techniques such as color-coded duplex sonography or power Doppler sonography can be employed in liver imaging. Although these techniques are used in most cases to obtain information about hepatic vasculature, it has been reported that they also provide additional information on the characterization of focal liver lesions based on their perfusion patterns [39]. 

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)... 

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