Definitely parallel to the the stream. 60 degrees is nice because all
protocols are set to that, but anything less is fine. When you go above 60
degrees the velocity will be falsely elevated. so a 0-49% at 80 degrees may
be 69-79% false. This may lead to a surgeon look at the tech sheet then the
MRA with malcontent toward his tech. Any published material will tell you go
or less, 0 degrees being the optimal. Just remember the doppler shift
corrects for anything greater than 0 degrees and no shift at 90 degrees. So
in turn nothing greater than 60 degrees is acceptable in any lab any where
and if someone says dont worry then I dont want my tech work done there.
>From: Dawn Stirrat <[log in to unmask]>
>Reply-To: UVM Flownet <[log in to unmask]>
>To: [log in to unmask]
>Date: Sun, 26 Mar 2006 20:41:28 -0500
>Hi all resident gurus.
> I need a favor, rather a question answered for me. When doing your
>doppler recordings, is the sample volume to be placed in the center of the
>stream, parallel to the vessel wall at 60 degrees or is it center of the
>flow jet (highest velocity recorded) parallel to the flow channel
>regardless of the angle? I know what I was taught and it seems there are
>varying opinions out there. We are running about 2-2 in my lab right now.
>My textbooks are all from the late 90's but i need to be able to bring back
>all information to the doctor in question, so if you could also provide
>references it would be much appreciated.
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