Doppler Ultrasound Angle Correction

Doppler Ultrasound Angle Correction:  An adjustment for correction of poor alignment of the PW spectral Doppler cursor with blood flow.

©Walter Rasmussen, R.D.C.S.

angle correction

Angle Correction Knob

 

 

angle correction enabled

Cursor flag indicates angle correction is enabled

Ultrasound angle correction is a feature that allows the sonographer to adjust the sample volume to compensate for a transducer position that is out of alignment with the direction of blood flow.  When angle correction is enabled, the sample volume cursor is augmented with a flag, which is adjusted by the sonographer to the assumed angle of blood flow.SD NO ANGLE CORRECTSD without angle correction– .9 m/secSD W ANGLE CORRECTSD with angle correction — 2.0 m/sec

Although angle correction is used extensively in vascular exams where blood flow is confined to arteries and veins, because of its potential for creating error due to misalignment in large chambers and turbulent areas, angle correction is not used in echocardiography.  The sonographer should however know how the machine signifies when the angle correction mode is active and how to disable it.

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