When you obtain your venous Doppler tracing. Freeze [of course] if you look at the touch screen there is the option for “time /slope”. Place the calipers.  The time shows up in ms.


Craig Haase, RT(R), RDMS, RVT

Vascular Ultrasound

North Shore Medical Center

500 Lynnfield Street, Lynn, MA 01904

Phone 781.477.3696; Fax 781.477.3479

e-mail: [log in to unmask]


From: UVM Flownet [mailto:[log in to unmask]] On Behalf Of Schneider, Joseph MD
Sent: Thursday, January 15, 2015 2:17 PM
To: [log in to unmask]
Subject: calipers to measure reflux time



Received a response from IAC critical of our venous studies because we don’t use the electronic calipers to measure reflux time.  We don’t because the time scale is easily seen on the spectrum and the physician can use that as well as the sonographer can, because having to make this measurement on say 30 spectra collected on a bilateral LE reflux exam would add unnecessary sonographer time to the exam, and because we’re not even sure that the iU22 will measure time. I have never seen time measured using the electronic calipers on any duplex exam. Does anyone else do this? On what type of scanner?




Joseph R. Schneider, M.D., Ph.D., F.A.C.S., R.V.T., R.P.V.I.

Vascular Surgery and Interventional Radiology Partners/VSIR

Cadence Physician Group




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