By John M. Reid (auth.), Merrill P. Spencer MD (eds.)
`Each affliction is successfully reviewed and merits from a number of figures... This publication represents a great precis of advances within the box and should curiosity these actively concerned about Doppler echocardiography.'
Acta Cardiologica, XLI (1986)
`Those who've realised the significance of the extra facts that are received by way of the complementary use of Doppler ulstrasound will locate that this ebook is a handy resource of reference. those that stay to be confident will locate that it places the topic properly into perspective.'
The British magazine of Radiology, fifty seven (1984)
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Additional info for Cardiac Doppler Diagnosis, Volume II
This creates a boundary layer between a centrally located jet consisting of an accelerated laminar flow and a surrounding, initially almost immobile blood cylinder. This boundary layer is, in fact, a mixing layer, but differs from that previously described since the flow motion can be transfered from central to peripheral regions. Indeed peripheral fluid elements acquire a centripetal movement. Its orientation is perpendicular to the centerline before becoming more parallel as it approaches the boundary layer.
Okuyama D, Kasai C. Yoshida Y: Measurement of sound velocity and absorption of human blood in 1-10 MHz frequency range. Rec. Elec. Commun. Eng Convers Tokohu Univ 41: 152-159, 1972. 14. Bakke T. Gytre T, Haagensen A, Giezendanner L: Ultrasonic measurement of sound velocity in whole blood. A comparison between an ultrasonic method and convention packedcell-volume test for hematocrit determination. Scand J C1in Lab Invest 35:473-478, 1975. 39 3. Time interval histogram - An alternative in the detection of the maximum velocity in the heart A.
1 Q. 0 C·2 ·3 -trTTTTTTTTTTTT'TTTTTTrTTl"TT'rTTrTT'I'TTI"TT'1"TTT'~~~ 2 1 0 ·1 Seconds Figure 22A. Continuous wave Doppler spectrum of normal aortic ejection velocities through the aortic valve. Hihg pass filtering eliminates the low frequency interferences. :::Jl. 4 ::E: 2 6 Pulse Doppler >- u 3 c: ~ 2 • C' Q) 110... 1 110... 0 u.. Q) . -1 Q. ' 0 C·2 ; - 1~ - , " • >- I "u0 • o~ ·1 ·3 0 1 Seconds 2 Figure 22B. Pulsed Doppler spectrum of the same aortic ejection velocities. - ·2 ·4 Figure 23. EtTect of aliasing on the pulsed Doppler frequency spectrum in the presence of high velocities produced by aortic valve stenosis.