We also recently converted to digital storage of our exams and were dismayed
to find we couldn't store a live clip of the doppler spectrum. We now change
our doppler sweep speed. This allows us the time to move through a stenosis
and document it on a frozen strip. You might give it a try. Not as good as
live but it gets the point accross,
Krista Smith, RDMS, RVT
Freeman Vascular Lab
----- Original Message -----
From: "Norma Vandenberghe" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, April 17, 2006 6:13 PM
Subject: Re: Doppler audio and digital clips
> Being a relatively new user of digital equipment, I must say that I was
> amazed to learn that scrolling Doppler could not be recorded as a loop.
> There are so many times when this would be a diagnostic help.
> When I assess a stenosis, no matter which vessel I may be looking at, I
> like to record the Doppler sweeping from the prestenotic area into the
> stenosis and through into the post-stenotic turbulence. I still put this
> sequence on my back-up tapes, but am unable to do it with digital
> When I look at the branch vessels off the aorta, I like to start with my
> Doppler in the aorta and pull it back into the renal or mesenteric
> vessel. In this way, I can demonstrate what the orificial flow is like,
> thus distinguishing origin lesions from proximal. Again, I still put it
> on tape, but no digital...
> I often speculate what vascular ultrasound would be like if it were not
> for the serendipitous fact that the frequency shifts we are working with
> just happen to be in the audible range of the human ear. If we did not
> have the audible Doppler to help find stenoses and to help manipulate
> the beam so we get the cleanest signal possible. I suspect some
> enterprising person like Kirk Beach would have found us dogs to tell us
> when the sample volume is in the vessel. We might still be able to do
> our jobs, but they would be a lot harder. I vote for Chihuahuas because
> they are so cute and love to howl...
> I say we start a grassroots rebellion to force the manufacturers to put
> the ability to record Doppler loops on all machines. And while we are at
> it, why not insist that everyone supplies bidirectional power angio?
> That would also not be hard, and would be a great help!..
> Norma J. Vandenberghe, RN, RVT
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