TCD+exam

__**Transcranial Doppler exam**__

Here is an image of the windows we use and should be familiar with for the transcranial Doppler exam. Then here is also a link to more information that talks about normal velocities, and even about the use of the exam to detect pathology such as stroke seen in the brain. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2659960/ A good thing to take a look at that explains the test a little more to us!

Danielle: CIrcle of Willis http://radiographics.rsna.org/content/33/1/E1/F5.large.jpg

Tatyana: Here is an MRA image of complete MCA occlusion. What direction of flow would you expect to see sonographically on TCD in MCA without any pathology (from the transtemporal window)? Image retrieved from: []



JEN: Since there is complete occlusion, I would not expect to see any flow coming into the MCA from the circle of Willis. In a patent MCA, or even a highly stenosed MCA (due to vasospasm), I would be looking at a depth from 3-6 cm with flow coming toward the transducer.