title: Comparison of real-time in vivo spectral and vector velocity estimation.
abstract: 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.
authors: Department of Radiology, Rigshospitalet, Copenhagen, Denmark. mmp@elektro.dtu.dk
authors: Mads Møller
authors: MM
authors: Pedersen
authors: Michael Johannes
authors: MJ
authors: Pihl
authors: Per
authors: P
authors: Haugaard
authors: Jens Munk
authors: JM
authors: Hansen
authors: Kristoffer Lindskov
authors: KL
authors: Hansen
authors: Michael Bachmann
authors: MB
authors: Nielsen
authors: Jørgen Arendt
authors: JA
authors: Jensen
mesh_terms: D000328:Adult; D000465:Algorithms; D001783:Blood Flow Velocity / Q000502:physiology; D002339:Carotid Arteries / Q000000981:diagnostic imaging* / Q000502:physiology*; D002560:Cerebrovascular Circulation; D003199:Computer Systems; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012212:Rheology / Q000379:methods*; D012680:Sensitivity and Specificity; D014463:Ultrasonography; D055815:Young Adult