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. Author manuscript; available in PMC: 2010 Dec 1.
Published in final edited form as: Ultrasound Med Biol. 2009 Oct 24;35(12):2042–2054. doi: 10.1016/j.ultrasmedbio.2009.06.1096

Table 2.

Percentage error in estimating Doppler velocity based on angle correction at some probable examples of true angles between target direction and ultrasound beam.

True True angle Used Used angle Difference
angle (deg) factor angle (deg) factor in angle (deg) % Error Estimation
5 1.0038 0 1.0000 −5 −0.3805 under
10 1.0154 5 1.0038 −5 −1.1430 under
20 1.0642 25 1.1034 5 3.6836 over
40 1.3054 45 1.4142 5 8.3350 over
50 1.5557 45 1.4142 −5 −9.0961 under
70 2.9238 75 3.8637 5 32.1464 over
85 11.4737 80 5.7588 −5 −49.8090 over