MCQ1


1. Which of the available zoom functions is preferred?




2. Continuous wave (cw) Doppler is useful because:




3. In ultrasound imaging axial resolution:




4. With regard to the safety aspects of diagnostic ultrasound which of the following statements is true? Diagnostic ultrasound:




5. The maximum Pulse Repetition Frequency (PRF) that the machine can use when imaging is limited by the:




6. In Doppler ultrasound the spectral mirror artifact occurs when:




7. The axial resolution in an ultrasound image is determined by the:




8. When a strongly reflective tissue structure is present sidelobes can cause:




9. When the ultrasound frequency is increased the Doppler shift:




10. The purpose of the matching layer in front of the transducer is to:




11. In laminar flow the velocity profile in a vessel (i.e. the distribution of blood velocities across the lumen of the vessel) is:




12. Refraction can cause total reflection of the ultrasound at an interface between two tissues when:




13. The colour that is displayed at each point in a conventional colour Doppler image is determined by the ultrasound machine's estimate of the:




14. An ultrasound pulse is attenuated by 40 dB. Its intensity is reduced by a factor of:




15. The wavelength of an ultrasound wave is:




16. Imaging with tissue harmonics:




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