Comparison of Real-Time In Vivo Spectral and Vector Velocity Estimation

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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The purpose of this study is to show whether a newly introduced vector flow method is equal to conventional spectral estimation. Thirty-two common carotid arteries of 16 healthy volunteers were scanned using a BK Medical ProFocus scanner (DK-2730, Herlev, Denmark) and a linear transducer at 5 MHz. A triplex imaging sequence yields both the conventional velocity spectrum and a two-dimensional vector velocity image. Several clinical parameters were estimated and compared for the two methods: Flow angle, peak systole velocity (PS), end diastole velocity (ED) and resistive index (RI). With a paired t-test, the spectral and vector angles did not differ significantly (p = 0.658), whereas PS (p = 0.034), ED (p = 0.004) and RI (p <0.0001) differed significantly. Vector flow can measure the angle for spectral angle correction, thus eliminating the bias from the radiologist performing the angle setting with spectral estimation. The flow angle limitation in velocity estimation is also eliminated, so that flow at any angle can be measured.
Original languageEnglish
JournalUltrasound in Medicine & Biology
Issue number1
Pages (from-to)145-151
StatePublished - 2012
CitationsWeb of Science® Times Cited: 38


  • Vector flow, In vivo, Transverse oscillation, Blood velocity estimation, Spectral estimation, Real-time
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