Color Blood Flow Imaging of the Heart by Dierk A. Redel

By Dierk A. Redel

Just a really few years after Edler and Hertz had defined the scientific use of M-mode echocardiographyl Satomura stated the applying of Dop­ 2 pler ultrasound to the learn of cardiac functionality. but Doppler ultrasound has been built-in into diagnostic perform in cardiology even more slowly than traditional (M-mode and two-dimensional) echocardiogra­ phy. Now, despite the fact that, great development within the curiosity of clinicians within the diagnostic use of Doppler ultrasound could be saw and should in reality be end result of the fresh introduction of colour circulate imaging. the cause of this progress could be that this technique makes it attainable to without delay visualize the blood move within the cardiovascular approach in cross-sectional perspectives. furthermore, the consequences are reproducible and masses more uncomplicated to appreciate than the older mapping strategies utilizing a single-gate Doppler. In its brief lifestyles many alternative names were used to explain this technique, for example, colour Doppler, colour stream imaging, real-time two-dimen­ sional Doppler echocardiography, and Doppler circulation imaging. This diver­ sity displays the big curiosity that many researchers have proven during this procedure. The technical improvement of colour blood circulate imaging (CBFI) - as this system may be known as during this booklet - has now not but reached a universally authorized regular of functionality in cardiology. regardless of this country of flux and the uncertainty approximately destiny advancements, i feel it really is justified to commit a whole booklet to this interesting method.

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The orange-yellow jet represents a small amount of regurgitant blood. 20a, b Systolic flow in the main pulmonary artery (MPA) and the proximal part of its two branches. Parasternal short axis view of the base (RBG2). a In neonates vortex formation at the bifurcation in common because of slight peripheral stenoses which are physiological for this age a b Later in life blood flows undisturbed from the MPA into both branches b Pulmonary Artery and Main Branches 41 healthy individuals and may be the consequence of this valve closure mechanism (Fig.

In Fig. 89 (p. 111). Typically, turbulence is observed in conditions of jet-like streaming as found in stenoses, regurgitations or high-pressure shunts. These turbulent jets are surrounded by eddies and vortices which may be imaged by a multicolored mosaic-like imaging pattern (see Figs. 4tt" '~ ' . ; ~ . . ~,' 'GE~AR III . . 0 LU-"- "~' . • . • • L \-y''-v . '''~ ~ ' -. : . /11 ~ . _ s. - . ,. -~ -1 '&: ' ..... ~ f#' f ~ . _~ ~r. ~ ~ 7 "t: -=. ~ '. _ - _-~.... -_; -= . ---AOR _ • . 5 Motions of the cardiac walls and valves in severe aortic incompetence.

4 Aorta (Ascending, Arch, Descending) The aorta receives the blood ejected from the left ventricle. Normally the aortic valve opens completely, aligning the leaflets parallel to the blood stream (Figs. 7). The aortic root is, however, not uniformly filled by the streaming blood. Between the aortic leaflets and the wall, in Valsalva's sinuses, there are special flow conditions. Blood flows backwards into each of the three sinuses around the free edges of the leaflets (Fig. 8). This may help to keep the valve in a position ready to close as soon as the left ventricular pressure falls below the aortic pressure with virtually no regurgitation.

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