What is the term when a venous system is duplicated?

The innermost lining of the common carotid artery is the:

Please populate the chart provided.  Please provide the vessels identified in each scanning approach listed below.  A response is required where an * is placed.  (2 vessels for transorbital, 2 vessels for suboccipital, 5 vessels for transtemporal) Transorbital Approach Suboccipital Approach Transtemporal Approach * * * * * *     *     *     *        

What could be optimized on the below image to evaluate ONLY the vein?

Please click on the area of the terminal ICA in the image provided.

TCD scanning planes and vessels identified

Please click on the area of the PCA in the image provided.

Squeezing an extremity distal to the area of interrogation is known as: 

Which vein is considered a superficial vein of the lower extremity?

An increased resistive index with absent diastolic flow in the common carotid artery may signify which of the following? (Think about drawing this waveform – what does a waveform look like when it has a very high RI and NO diastolic flow? – think about a low RI waveform and now get rid of the diastolic flow component if it’s absent – does this increase the resistivity – what does this waveform tell you?)