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KMID : 0357520080310040379
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Journal of Radiological Science and Technology
2008 Volume.31 No. 4 p.379 ~ p.387
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The Study of Aliasing and Incidence Angle Dependence of Doppler Image on Humeral Artery
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Kim Sang-Jin
Ji Tae-Jeong
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Abstract
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Among methods to eliminate aliasing effects, the method of increasing velocity scale gradually eliminated the phenomenon in which the direction of the blood flow appeared in reverse. It was done by increasing the velocity scale while maintaining other parameters in the same state. The method of setting the Doppler angle to did not show significant changes in the wave pattern of the spectrum according to the angle. In actual ultrasonography tests, more accurate tests are expected to be carried out by applying variations to the velocity scale under the considerations of speed, accuracy, and convenience of the examination. The results showed that blood flow velocity increases exponentially according to the Doppler Angle. When the angle goes over , the velocity value increases to an unmeasurable state. This indicates that in blood flow velocity measurements, the blood flow velocity is very dependent on the Doppler Angle. It also shows that the error increases when the incidence angle to the direction of blood flow exceeds , and when the angle exceeds , the error becomes even greater. In addition, he experiment results showed that an angle below is appropriate and for blood flow velocity measurements in extremity vessels, the most appropriate Doppler Angle is from to .
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KEYWORD
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Doppler, Aliasing, Doppler angle, blood flow velocity
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