Color Doppler study allows you show and quantitatively assess stenosis valve openings . It displays the area of stenosis. and stream , wherein by characteristics from normal . Stenosis of the valve hole leads to flow formation by type ” candle flame ” at the place of constriction . The color flow has a mosaic structure. with shades of blue , green andyellow colors , reflecting the high speed and turbulent blood flow .
For Doppler color scanning, the signal should be directed parallel to the blood flow . AT about tive case, the degree of stenosis may be underestimated . For improvement of the Doppler signal may con Bova deviation sensor , even if this worsens grayish image . With calcification of valve cusps or fibrous ring color Doppler signal drops out at areas of calcification . The increase in gain leads to reduce clarity . It concerns and anatomical information , and Doppler signal .
Theoretically, the measurement area of the stenotic opening ideally spend at mode color extra plerovskogo study . but with practical point of view this difficult , since as forqualitative measurement of the anatomical size required direction of the ultrasonic beam perpendicular to the investigated structure , and for best doppler signal on The board of the ultrasound beam is parallel to the blood flow .