 |
| Fig.4.39 |
In normal individuals, flow is usually seen to fill the entirety of the left ventricular outflow tract. In the short-axis view of the aorta, normal flow can be seen filling the aortic valve orifice in some patients. Figure 4.39 demonstrates the appearance of normal aortic outflow in a variance map. Little aliasing is seen in this view since the maximum scan depth is rather shallow. In addition, the dull hues of red indicate that relatively low mean velocities were calculated in this situation due to the rather perpendicular orientation of the interrogating beam with the aorta.
 |
| Fig.4.40 |
Unlike mitral stenosis, the forward jet of aortic stenosis into the aortic root is rarely well delineated using color flow methods. In this disorder, turbulence is seen to fill almost the whole of the aortic root and to possess little directional information. When imaged, these jets frequently have marked variance in the final display, as is seen in Figure 4.40. The turbulence begins at the orifice (arrow) and generally fills the entire root. Note that a discrete jet is not visualized.
2004