RIU 320 Lecture Notes - Lecture 61: Sound, Trigonometric Functions, Medical Ultrasound
17 Jun 2020
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That is, when the blood cells are moving either directly toward or directly away from the transducer, the velocity measurement is. 100% accurate: however, when an angle exists between the direction of flow and the sound beam, the measured velocity is less than the true velocity. If the cosine (angle) is reduced by half, the measured. Cosine 0 degrees is 1, indicating flow toward the transducer, whereas cosine 180 degrees or -1, indicating flow away from the transducer. 1. 0: what is the relationship between actual and measured velocities when blood moves perpendicular to the sound beam, when the direction of the flow is perpendicular (90 degrees) to the sound beam, cosine of 90 degrees is zero. Bidirectional doppler: the most common clinical doppler devices are, audio of bidirectional doppler requires stereo bidirectional, which distinguish the direction of flow toward or away from the transducer.
