What is ICA and CCA?

What is ICA and CCA?

CCA = common carotid artery. ICA = internal carotid artery.

What is PCA ICA?

While the goal in PCA is to find an orthogonal linear transformation that maximizes the variance of the variables, the goal of ICA is to find the linear transformation, which the basis vectors are statistically independent and non-Gaussian.

What is a good ICA CCA ratio?

Poststenotic narrowing of the ICA was defined with use of the ratio of the lumen diameter of the ICA to that of the common carotid artery (CCA). The normal range of the ICA/CCA ratio was defined in 2966 symptomatic or contralateral carotid arteries with 0% to 49% stenosis.

What is a normal CCA?

Normal flow in the CCA is usually greater than 45 cm/sec. High flow (>135 cm/sec) in both CCAs may be due to high cardiac output in hypertensive patients or young athletes.

Which is more important, PCA or ICA?

PCA removes correlations, but not higher order dependence ICA removes correlations andhigher order dependence PCA: some components are more important than others (recall eigenvalues) ICA: all components are equally important PCA: vectors are orthogonal (recall eigenvectors of covariance matrix)

How are recall eigenvalues different from Ica and PCA?

Differences between ICA and PCA. PCA removes correlations, but not higher order dependence ICA removes correlations and higher order dependence PCA: some components are more important than others (recall eigenvalues) ICA: all components are equally important. PCA: vectors are orthogonal (recall eigenvectors of covariance matrix)

What is the normal ICA / V ratio for PSV?

The V(ICA)/V(CCA) ratio for PSV increased with age only in men and its values were significantly higher in women than in men in the group I and group II age groups. Conclusion: This study provides normal reference values for the V(ICA)/V(CCA) ratios for PSV and shows that the ratio varies with age and sex.

What are the reference values for ICA narrowing?

The upper reference limit for the ratio can serve as an aid in the more specific identification of patients with minor or mild ICA narrowing. Normal reference values of ratios of blood flow velocities in internal carotid artery to those in common carotid artery using Doppler sonography J Clin Ultrasound.