quiz

1. What system parameter could be changed to optimize this clinical image? a.) Decrease wall filter b.) Increase sample volume size c.) Increase pulse repetition frequency d.) Decrease baseline location You said: c). Increase pulse repetition frequency Incorrect! Refer to Optimization Technique for Pulsed Doppler for further study. See: Analysis of Doppler Signal 2. Which statement describes laminar flow? a.) Flow in a vessel that is faster near the wall of the vessel. b.) The Doppler signal representative of this type of flow would display a wide range of frequencies. c.) Flow in a vessel that is all of the same velocity. d.) The Doppler signal representative of this type of flow would display a small range of frequencies. You said: b). The Doppler signal representative of this type of flow would display a wide range of frequencies. Correct! Refer to Factors Affecting the Resulting Doppler Spectrum for further study. See: Analysis of Doppler Signal 3. If a large sample volume size is used when performing pulsed Doppler how will the resulting signal be affected? a.) There will be no change from a signal obtained using a small sample volume size. b.) The resulting Doppler signal will have a large range of frequencies c.) The resulting Doppler signal will have a small range of frequencies d.) The resulting information will be less accurate. You said: b). The resulting Doppler signal will have a large range of frequencies Correct! Refer to Sample Volume Size for further study. See: Analysis of Doppler Signal 4. Flow disturbances can be identified in the Doppler waveform as a.) Increased brightness of the Doppler waveform b.) Increased turbulence of the Doppler waveform c.) Increased spectral broadening of the Doppler waveform d.) Increased velocity in the Doppler waveform You said: a). Increased brightness of the Doppler waveform Incorrect! Refer to Characteristics of Disturbed Flow for further study. See: Analysis of Doppler Signal 5. The measurement most commonly used to measure velocity is a.) End diastolic velocity b.) Mean velocity c.) Resistive index d.) Peak systolic velocity You said: d). Peak systolic velocity Correct! Refer to Maximum Velocity Measurements for further study. See: Analysis of Doppler Signal 6. When performing a pulsed Doppler measurement it is recommended that a.) Doppler angles greater than 60° be used b.) Doppler angles approaching 90° be used c.) Doppler angles less than 60° be used d.) A Doppler angle of 90° be used You said: c). Doppler angles less than 60° be used Correct! Refer to Angle Correction for further study. See: Analysis of Doppler Signal 7. Which statement identifies the proper technique when obtaining a pulsed Doppler waveform? a.) A small sample volume is used placed near the wall of the vessel. b.) Longitudinal views using Doppler angles greater than 60° are used. c.) The sample volume angle correction is parallel to the vessel wall. d.) Transverse views using Doppler angles greater than 60° are used. You said: c). The sample volume angle correction is parallel to the vessel wall. Correct! Refer to Angle Correction for further study. See: Analysis of Doppler Signal 8. Which statement below accurately describes the function of a Doppler wall filter? a.) The Doppler wall filter controls amplification of the incoming Doppler signals. b.) The Doppler wall filter eliminates the lowest Doppler shifts from the display. c.) The Doppler wall filter controls the pulse repetition frequency. d.) The Doppler wall filter controls the position of the Doppler baseline. You said: b). The Doppler wall filter eliminates the lowest Doppler shifts from the display. Correct! Refer to Hints for Optimization for further study. See: Analysis of Doppler Signal 9. Which statement below accurately describes the function of angle correction? a.) Angle correction adjusts the Doppler scale to account for the Doppler angle between the insonating beam and the target vessel. b.) Angle correction adjusts the Doppler scale to account for the pulse repetition frequency. c.) Angle correction adjusts the Doppler scale to account for the sample volume size that is used to obtain the Doppler signal. d.) Angle correction adjusts the Doppler scale to account for the wall filter that is used on the Doppler signal. You said: a). Angle correction adjusts the Doppler scale to account for the Doppler angle between the insonating beam and the target vessel. Correct! Refer to page Hints for Optimization for further study. See: Analysis of Doppler Signal 10. Which statement below accurately describes the function of Doppler gain? a.) Doppler gain controls the amplification of the outgoing Doppler signals. b.) Doppler gain controls the amplification of the filtered Doppler signals. c.) Doppler gain controls the amplification of the incoming Doppler signals. d.) Doppler gain controls the amplification of the compressed Doppler signals. You said: c). Doppler gain controls the amplification of the incoming Doppler signals. Correct! Refer to Optimization for further study. See: Analysis of Doppler Signal