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EACVI Echo Handbook - sample

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Chapter 1 Examination A

Chapter 1 Examination A Continuous-wave and pulsed-wave Doppler Sample position B Controls the position of the sample volume (Fig. 1.1.13ABC, see also Box 1.1.8) Fig. 1.1.12 Doppler velocity scale. A: Adequate, B: Too low (i.e. aliasing) Box 1.1.8 Recommendation Sample volume should be positioned at the tips of the (open) valve leaflets (for MV inflow) Sample volume Controls the size of the sample volume (Fig. 1.1.14ABC) A B C A B C 8 Fig. 1.1.13 Sample position. A: Too high, B: Appropriate C: Too low

AB C A B C SV 10.1 mm SV 5.1 mm SV 1.0 mm The EACVI Echo Handbook Fig. 1.1.14 Sample size. A: Too large, B: Appropriate, C: Too small ◆ Small sample volume: good spatial resolution at lower velocity resolution ◆ Large sample volume: good velocity resolution at lower spatial resolution Continuous-wave and pulsed-wave Doppler: settings Wall filter Controls the threshold for velocities displayed in the velocity spectrum (Fig. 1.1.15ABC, Box 1.1.9) Sweep speed Controls the refresh rate of the velocity spectrum (Fig. 1.1.16AB, Box 1.1.10) Box 1.1.9 Recommendation Wall filter should be as low as possible while avoiding pollution by myocardial velocities Box 1.1.10 Recommendation Always use a sweep speed of 100 mm/s unless looking for inter-beat variations 9

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